| 1. |
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| 2. |
- Bankel, Johan, et al.
(författare)
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The CDIO syllabus: a comparative study of expected student proficiency
- 2003
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Ingår i: European Journal of Engineering Education. - : Taylor & Francis. - 0304-3797 .- 1469-5898. ; 28:3, s. 297-315
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Tidskriftsartikel (refereegranskat)abstract
- Engineering students must graduate with command of a vast body of technical knowledge. They must possess personal, interpersonal and system-building skills to function in teams, and be prepared to produce products and systems. Their education must have been structured under a curriculum blending ability to combine technical expertise with ethical, innovative, philosophical and humanistic acumen. This paper describes a unique international collaboration among four universities to reform engineering education. The collaborators agreed to a statement of goals, which includes descriptions of knowledge, skills and attitudes vital to an effective education, and codifies proficiency levels expected of graduates. We developed and utilized unique stakeholder surveys both to validate our prototype and to determine desired proficiency levels. This collaboration resulted in The CDIO Syllabus, A Statement of Goals for Undergraduate Engineering Education. The syllabus is both a template and a process that can be used to customize the syllabus to others' programmes. It can define new educational initiatives/and be employed as the basis for rigorous assessment. This paper details how, with the input of industry, academia and others, we employed an engineering problem-solving paradigm to effect our redesign. It outlines the syllabus and the unique process employed to create it.
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| 3. |
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| 4. |
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| 5. |
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| 6. |
- Berggren, Karl-Fredrik
(författare)
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All-Time High
- 2010
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Ingår i: Fysikaktuellt. - 0283-9148. ; :4, s. 3-3
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 7. |
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| 8. |
- Berggren, Karl-Fredrik, et al.
(författare)
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Basic Modeling of Openness, Quantum States and Transport in Two- and Three-Dimensional Ballistic Cavities
- 2010
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Ingår i: Journal of Siberian Federal University. Mathematics & Physics. ; 3, s. 280-288
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Tidskriftsartikel (refereegranskat)abstract
- A basic model for particle states and current flow in open quantum dots/billiards are investigated. The model is unconventional and extends the use of complex potentials first introduced in phenomenological nuclear inelastic scattering theory (the optical model). Attached leads/source drain are represented by complex potentials. Probability densities and currents flows for open 2D quantum dots/billiards are calculated and the results are compared with microwave measurements used to emulate the dot. We also apply the model to a recangular enclosure and report on helical flows guided by nodal lines and disc-like accumulations of flow lines. The model is of conceptual as well as practical and educational interest.
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| 9. |
- Berggren, Karl-Fredrik, et al.
(författare)
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Basic modelling of transport in 2D wave-mechanical nanodots and billiards with balanced gain and loss mediated by complex potentials
- 2018
-
Ingår i: Journal of Physics. - : IOP PUBLISHING LTD. - 0953-8984 .- 1361-648X. ; 30:20
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Tidskriftsartikel (refereegranskat)abstract
- Non-Hermitian quantum mechanics with parity-time (PT) symmetry is presently gaining great interest, especially within the fields of photonics and optics. Here, we give a brief overview of low-dimensional semiconductor nanodevices using the example of a quantum dot with input and output leads, which are mimicked by imaginary potentials for gain and loss, and how wave functions, particle flow, coalescence of levels and associated breaking of PT symmetry may be analysed within such a framework. Special attention is given to the presence of exceptional points and symmetry breaking. Related features for musical string instruments and wolf-notes are outlined briefly with suggestions for further experiments.
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| 10. |
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| 11. |
- Berggren, Karl-Fredrik, et al.
(författare)
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Chaos in a quantum dot with spin-orbit coupling
- 2001
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Ingår i: Foundations of physics. - 0015-9018 .- 1572-9516. ; 31:2, s. 233-242
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Tidskriftsartikel (refereegranskat)abstract
- Level statistics are nodal point distribution in a rectangular semiconductor quantum dot are studies for different degrees of spin-orbit coupling. The chaotic features occurring from the spin-orbit coupling have no classical counterpart. Using experimental values of GaSb/InAs/GaSb semiconductor quantum wells we find that level repulsion can lead to the semi-Poisson distribution for nearest level separations. Nodal lines and nodal points are also investigated. Comparison is made with nodal point distributions for fully chaotic states.
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| 12. |
- Berggren, Karl-Fredrik, et al.
(författare)
-
“Correlation and disorder effects on electron transport in modulation-doped semiconductor quantum point contacts” (invited)
- 2013
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- ABSTRACT We simulate effects of electron localization and quantum correlations in realistic GaAs/AlGaAs quantum point contacts (QPCs) in the presence of randomly distributed donors (1) using spin-relaxed density functional theory (DFT/LSDA). Two different configurations of gates defining the QPCs were studied: a split gate and a top gate in addition to the split gate. In both cases we recover the conventional fluctuation-free parabolic electrostatic potential when the distance between the donor layer and the 2D electron gas exceeds 70 nm. Hence we also find ballistic phenomena such as integer conductance steps as well as the 0.7 anomaly. The electrostatic potential changes dramatically,however, when the random donors are placed closer to the 2D gas. Electron localization is then increased and conductance fluctuations and resonance peaks appear. At the same time the usual conductance steps vanish. By charging asymmetrically the split gates voltage we have found that conductance fluctuations caused by random donors are shifted while the anomalies caused by interaction effects may remain. Resonance peaks in the conductance derive from localized states inside within the QPC. The nature of electron localization has been discussed in our previous study (2) where we stress the crucial role of confinement potential on the formation of electron localization. In the present study we have shown that electron localization may be caused by randomly distributed donors and play an important role in electron transport, especially near the pinch-off regime. The results of our numerical simulations agree with recent experimental studies (3). (1) J.A. Nixon, J.H. Davies, and H.U Baranger, Phys. Rev. B 43, 12638 (1991) (2) I. I. Yakimenko, V. S. Tsykunov and K.-F. Berggren, J. Phys. Condens. Matter 25, 072201 (2013)(3) L.W. Smith, K. J. Thomas, M. Pepper, D. A. Ritchie, I. Farrer, J.P. Griffiths, G.A.C. Jones, J. of Phys.: Conf. Series 376, 012018, (2012)
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| 13. |
- Berggren, Karl-Fredrik, et al.
(författare)
-
Crossover from regular to irregular behavior in current flow through open billiards
- 2002
-
Ingår i: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. - 1539-3755. ; 66:1
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Tidskriftsartikel (refereegranskat)abstract
- We discuss signatures of quantum chaos in terms of distributions of nodal points, saddle points, and streamlines for coherent electron transport through two-dimensional billiards, which are either nominally integrable or chaotic. As typical examples of the two cases we select rectangular and Sinai billiards. We have numerically evaluted distribution functions for nearest distances between nodal points and found that there is a generic form for open chaotic billiards through which a net current is passed. We have also evaluated the distribution functions for nodal points with specific vorticity (winding number) as well as for saddle points. The distributions may be used as signatures of quantum chaos in open systems. All distributions are well reproduced using random complex linear combinations of nearly monochromatic states in nominally closed billiards. In the case of rectangular billiards with simple sharp-cornered leads the distributions have characteristic features related to order among the nodal points. A flaring or rounding of the contact regions may, however, induce a crossover to nodal point distributions and current flow typical for quantum chaos. For an irregular arrangement of nodal points, as for example in the Sinai billiard, the quantum flow lines become very complex and volatile, recalling chaos among classical trajectories. Similarities with percolation are pointed out. ©2002 The American Physical Society.
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| 14. |
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| 15. |
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| 16. |
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| 17. |
- Berggren, Karl-Fredrik, 1937-, et al.
(författare)
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Effects of electron interactions at crossings of Zeeman-split subbands in quantum wires
- 2005
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Ingår i: Physical Review B. - : American Physical Society. - 2469-9950 .- 2469-9969. ; 71:11, s. 115303-1-115303-5
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Tidskriftsartikel (refereegranskat)abstract
- Recent experimental studies of Zeeman-split one-dimensional subbands in ballistic quantum wires in an in-plane magnetic field show that additional nonquantized conductance structures occur as subbands cross at low electron densities [A. C. Graham et al., Phys. Rev.Lett. 91, 136404 (2003)]. These structures are called 0.7 analogs. We analyze the experimental transconductance data within the Kohn-Sham spin-density-functional method, including exchange and correlation effects for an infinite split-gate quantum wire in a parallel, in-plane magnetic field B∥. Energy levels are found to rearrange abruptly as they cross due to polarization effects driven by exchange and Coulomb interactions. Experimental qualitative features are explained well by this model. ©2005 The American Physical Society.
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| 18. |
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| 19. |
- Berggren, Karl-Fredrik, et al.
(författare)
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Effects of exchange and electron correlation on conductance and nanomagnetism in ballistic semiconductor quantum point contacts
- 2002
-
Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 66:8
-
Tidskriftsartikel (refereegranskat)abstract
- The spontaneous magnetization of a quantum point contact (QPC) formed between two large quantum dots by a lateral confinement of a high-mobility two-dimensional electron gas is studied for a realistic GaAs/AlxGa1-xAs heterostructure. The model of the device incorporates the contributions from a patterned gate, doping, surface states, and mirror charges. To explore the magnetic properties, the Kohn-Sham local spin-density formalism is used with exchange and correlation potentials that allows for local spin polarization. Exchange is the dominant mechanism behind local magnetization within the QPC, while the correlation part is less prominent. However, the correlation potential gives rise to an important correction in the QPC potential. Below the first conduction plateau we thus find a magnetized regime corresponding approximately to a single electron spin. Using an approximate separable saddle potential we compute the conductance and recover the so-called similar to0.7 (2e(2)/h) conduction anomaly plus an additional anomaly at similar to0.4 (2e(2)/h) below which the magnetization collapses.
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| 20. |
- Berggren, Karl-Fredrik, 1937-, et al.
(författare)
-
Electrical Resonance Circuits as Analogs to Quantum Mechanical Billiards
- 2006
-
Ingår i: Acta Physica Polonica. A. - 0587-4246 .- 1898-794X. ; 109, s. 33-42
-
Tidskriftsartikel (refereegranskat)abstract
- We propose that a two-dimensional electric network may be used for fundamental studies of wave function properties, transport, and related statistics. Using Kirchhoff 's current law and the jw-method we find that the network is analogous to a discretized Schrodinger equation for quantum billiards and clots. Thus the complex electric potentials play the role of quantum rnechanical wave functions.
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| 21. |
- Berggren, Karl-Fredrik, 1937-, et al.
(författare)
-
Electron transport and Nanomagnetism
- 2008
-
Ingår i: Nordforsk Network in Nanospintronics Theory and Simulations,2008.
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Electron states, local magnetization and conductance in realistic quantum point contacts (QPCs) with different geometry and applied gate voltages will be discussed for a model GaAs/AlGaAs device. Using the local spin density approximation (LSDA) we recover ferromagnetic spatially split solutions in the pinch-off regime as well as antisymmetric solutions that occur with increasing voltage. These kind of spin states, which may appear in a repeated fashion in the few electron regime, are precursors to an extended ferromagnetic state that may be associated with the 0.7 (2e2/h) conductance anomaly. As the length of the QPC increases, so does the spin polarization and the difference in conductance between up-spin and down-spin electrons, resulting in movement of 0.7 anomaly towards the value of 0.5 (2e2/h). Due to the strong ferromagnetic spin polarization in a long QPC it will effectively work as a spin filter which may be useful for spintronics application.
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| 22. |
- Berggren, Karl-Fredrik, et al.
(författare)
-
Electrons in one dimension
- 2010
-
Ingår i: Philosophical Transactions. Series A. - : The Royal Society. - 1364-503X .- 1471-2962. ; 368, s. 1141-1162
-
Forskningsöversikt (refereegranskat)abstract
- In this article, we present a summary of the current status of the study of the transport of electrons confined to one dimension in very low disorder GaAs–AlGaAs heterostructures. By means of suitably located gates and application of a voltage to ‘electrostatically squeeze’ the electronic wave functions, it is possible to produce a controllable size quantization and a transition from two-dimensional transport. If the length of the electron channel is sufficiently short, then transport is ballistic and the quantized subbands each have a conductance equal to the fundamental quantum value 2e2/h, where the factor of 2 arises from the spin degeneracy. This mode of conduction is discussed, and it is shown that a number of many-body effects can be observed. These effects are discussed as in the spin-incoherent regime, which is entered when the separation of the electrons is increased and the exchange energy is less than kT. Finally, results are presented in the regime where the confinement potential is decreased and the electron configuration relaxes to minimize the electron–electron repulsion to move towards a two-dimensional array. It is shown that the ground state is no longer a line determined by the size quantization alone, but becomes two distinct rows arising from minimization of the electrostatic energy and is the precursor of a two-dimensional Wigner lattice.
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| 23. |
- Berggren, Karl-Fredrik
(författare)
-
Entanglement väcker språkdebatt
- 2010
-
Ingår i: Fysikaktuellt. - 0283-9148. ; :2, s. 5-5
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Tidskriftsartikel (refereegranskat)
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| 24. |
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| 25. |
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| 26. |
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| 27. |
- Berggren, Karl-Fredrik, 1937-
(författare)
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Fysik
- 2012. - 1
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Ingår i: Naturvetarguiden. - Nacka : Naturvetarna. - 9789163704130
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Bokkapitel (populärvet., debatt m.m.)
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| 28. |
- Berggren, Karl-Fredrik, et al.
(författare)
-
Fysikersamfundet 90 år
- 2010
-
Ingår i: Fysikaktuellt. - 0283-9148. ; :2, s. 12-12
-
Tidskriftsartikel (populärvet., debatt m.m.)
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| 29. |
- Berggren, Karl-Fredrik, 1937-
(författare)
-
Förolämpande och konspiratorisk - debattinlägg
- 2005
-
Ingår i: Sydsvenska Dagbladet. - Malmö : Sydsvenska dagbladets AB. ; 28 maj 2005, s. C2-C3
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 30. |
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| 31. |
- Berggren, Karl-Fredrik
(författare)
-
Hur förstår man fysik?
- 2010
-
Ingår i: Fysikaktuellt. - : Svenska Fysikersamfundet. ; :3, s. 3-3
-
Tidskriftsartikel (populärvet., debatt m.m.)abstract
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| 32. |
- Berggren, Karl-Fredrik
(författare)
-
Hur står det till med SFS?
- 2011
-
Ingår i: Fysikaktuellt. - 0283-9148. ; :4, s. 5-5
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 33. |
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| 34. |
- Berggren, Karl-Fredrik
(författare)
-
Jakten på liv i universum
- 2013
-
Ingår i: Fysikaktuellt. - 0283-9148. ; :4, s. 26-26
-
Recension (populärvet., debatt m.m.)
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| 35. |
- Berggren, Karl-Fredrik, et al.
(författare)
-
Modeling of open quantum dots and wave billiards using imaginary potentials for the source and the sink
- 2010
-
Ingår i: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 12:073005
-
Tidskriftsartikel (refereegranskat)abstract
- A heuristic model for particle states and current flow in open ballistictwo-dimensional (2D) quantum dots/wave billiards is proposed. The modelmakes use of complex potentials first introduced in phenomenological nuclearinelastic scattering theory (the optical model). Here we assume that externalinput and output leads connecting the system to the source and the drain regionsmay be represented by complex potentials. In this way, a current may be set upbetween the two ‘pseudo-leads’. Probability densities and current flows for anopen quantum dot are analyzed here numerically and the results are comparedwith the microwave measurements used to emulate the system. The model isof conceptual as well as practical interest. In addition to quantum billiards, itmay be used as a tool per se to analyze transport in classical wave analogues,such as microwave resonators, acoustic resonators, effects of leakage on suchsystems, etc.
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| 36. |
- Berggren, Karl-Fredrik, 1937-, et al.
(författare)
-
Nature of electron states and symmetry breaking in quantum point contacts according to the local spin density approximation
- 2008
-
Ingår i: Journal of Physics. - : IOP Publishing. - 0953-8984 .- 1361-648X. ; 20:16
-
Tidskriftsartikel (refereegranskat)abstract
- Electron states and local magnetization in quantum point contacts (QPCs) with different geometries and applied gate voltages are examined for a model GaAs/AlGaAs device. Using the local spin density approximation (LSDA) we recover ferromagnetic spatially split solutions in the pinch-off regime as well as antisymmetric solutions that occur with decreasing gate voltage. These kinds of spin states, which may appear in a repeated fashion in the few-electron regime, are precursors to an extended ferromagnetic state that may be associated with the 0.7 conductance anomaly. We briefly comment on some recent experiments indicating the presence of bound states (Yoon et al 2007 Phys. Rev. Lett. 99 136805). We have not found any indication of such states but suggest that the accumulations of spin and charge at the two ends of a QPC and associated singlet and triplet states are relevant in this context. © 2008 IOP Publishing Ltd.
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| 37. |
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| 38. |
- Berggren, Karl-Fredrik, et al.
(författare)
-
Nature of streamlines for Berry-type wave functions in open 3D cavities
- 2009
-
Ingår i: MATHEMATICAL MODELING OF WAVE PHENOMENA. - : American Institute of Physics (AIP). - 9780735406438 ; , s. 253-259
-
Konferensbidrag (refereegranskat)abstract
- We explore preliminary a 3D wave cavity in which the interior complex wave functions are of Berry-type. Streamlines and novel disc-like features are uncovered by means of selective and interactive visualization.
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| 39. |
- Berggren, Karl-Fredrik, et al.
(författare)
-
New directions with fewer dimensions
- 2002
-
Ingår i: Physics world. - 0953-8585 .- 2058-7058. ; 15:10, s. 37-42
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Tidskriftsartikel (refereegranskat)
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| 40. |
- Berggren, Karl-Fredrik
(författare)
-
NSC during 20 years
- 2009
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 41. |
- Berggren, Karl-Fredrik, et al.
(författare)
-
On the role of electron exchange and correlation in semiconductor quantum dots
- 2001
-
Ingår i: Nanotechnology. - : IOP Publishing. - 0957-4484 .- 1361-6528. ; 12:4, s. 529-532
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Spontaneous magnetization of single and coupled quantum dots formed by lateral confinement of a high-mobility two-dimensional electron gas is studied for a realistic GaAs/AlGaAs heterostructure. The modelling of the device takes into account contributions from a patterned gate, doping, surface states, and mirror charges. To explore the magnetic properties we use the Kohn-Sham local spin-density formalism including the contributions from electron correlation and exchange. We show by explicit calculations that the exchange is the dominant mechanism driving a spontaneous magnetization of a dot. The correlation potential reduces the amount of level splitting and usually affects the electron content in the dot at a given gate voltage. These effects are, however, small and may be neglected under present circumstances. Single dots with up to 50 electrons have been studied.
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| 42. |
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| 43. |
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| 44. |
- Berggren, Karl-Fredrik, 1937-, et al.
(författare)
-
Quantum cellular automata - Theory, experimentation and prospects
- 2006
-
Ingår i: Quantum Cellular Automata. - London : Imperial College Press. - 1860946321 - 9781860946325 ; , s. -300
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- The Quantum Cellular Automaton (QCA) concept represents an attempt to break away from the traditional three-terminal device paradigm that has dominated digital computation. Since its early formulation in 1993 at Notre Dame University, the QCA idea has received significant attention and several physical implementations have been proposed. This book provides a comprehensive discussion of the simulation approaches and the experimental work that have been undertaken on the fabrication of devices capable of demonstrating the fundamentals of QCA action. Complementary views of future perspectives for QCA technology are presented, highlighting a process of realistic simulation and of targeted experiments that can be assumed as a model for the evaluation of future device proposals.Show more Show less
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| 45. |
- Berggren, Karl-Fredrik, et al.
(författare)
-
Quantum chaos among nodal points and streamlines at ballistic electron transport through open quantum dots
- 2001
-
Ingår i: Nanotechnology. - : IOP Publishing. - 0957-4484 .- 1361-6528. ; 12:4, s. 562-565
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- We trace signatures of quantum chaos in the distribution of nodal points and streamlines for coherent electron transport through different types of quantum dots (chaotic and regular). We have calculated normalized distribution functions for the nearest distances between nodal points and found that this distribution may be used as a signature of quantum chaos for electron transport in open systems. Different chaotic billiards show the same characteristic distribution function for nodal points. This signature of quantum chaos is well reproduced using well known approaches for chaotic wavefunctions. We have also investigated the quantum flows which display some remarkable features.
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| 46. |
- Berggren, Karl-Fredrik, et al.
(författare)
-
Quantum stress in chaotic billiards
- 2008
-
Ingår i: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics. - 1063-651X .- 1095-3787. ; 77:066209
-
Tidskriftsartikel (refereegranskat)abstract
- This paper reports on a joint theoretical and experimental study of the Pauli quantum-mechanical stress tensor T(x,y) for open two-dimensional chaotic billiards. In the case of a finite current flow through the system the interior wave function is expressed as =u+iv. With the assumption that u and v are Gaussian random fields we derive analytic expressions for the statistical distributions for the quantum stress tensor components T. The Gaussian random field model is tested for a Sinai billiard with two opposite leads by analyzing the scattering wave functions obtained numerically from the corresponding Schrödinger equation. Two-dimensional quantum billiards may be emulated from planar microwave analogs. Hence we report on microwave measurements for an open two-dimensional cavity and how the quantum stress tensor analog is extracted from the recorded electric field. The agreement with the theoretical predictions for the distributions for T(x,y) is quite satisfactory for small net currents. However, a distinct difference between experiments and theory is observed at higher net flow, which could be explained using a Gaussian random field, where the net current was taken into account by an additional plane wave with a preferential direction and amplitude.
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| 47. |
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| 48. |
- Berggren, Karl-Fredrik, et al.
(författare)
-
Science at the ESS : a brief outline
- 2012
-
Ingår i: In Pursuit of a Promise. - : Arkiv förlag & tidskrift. - 9789179242473 ; , s. 31-47
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- On 28 May 2009, at a closed meeting in Brussels, ministers and state secretaries of education and science from several EU countries decided to build the European Spallation Source (ESS) in Lund, Sweden. Or did they?It is common for big European science projects to be surrounded by secrecy and political deceit, but the ESS is extraordinary in its elusiveness. There is a remarkable lack of concrete economic, political, technical and scientific underpinnings to the project but a boasting certainty in the promises of future paybacks.The ESS is an accelerator-based neutron spallation facility that will cost billions of Euros to build and run. It is expected to bring new knowledge in several fields including materials science, energy research, and the life sciences. But its financing is not yet certain, and future returns hard to predict. How then could the decision to build ESS occur? Why was there so little organized resistance?This book places the ESS project in its political and scientific context. It links the decisions taken to the history of Big Science in Europe and in Sweden. It looks at the dynamic political processes of establishing this megaproject in a small town in the south of Sweden. The eight chapters start from a paradoxical state of affairs: The ESS is not funded, and not formally decided in any binding agreements yet it is treated as a future reality, locally and nationally, loaded with promises of scientific, economic and social returns.The book makes a much-needed first contribution to the analysis of the ESS project and its political, environmental, and social ramifications. It should be read by scholars of science and technology studies, politicians and the interested general public.
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| 49. |
- Berggren, Karl-Fredrik
(författare)
-
Signerat: Nya krafter vid rodret
- 2012
-
Ingår i: Fysikaktuellt. - Stockholm : Svenska fysikersamfundet. - 0283-9148. ; :4, s. 3-3
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 50. |
- Berggren, Karl-Fredrik
(författare)
-
Signerat; Välkommen till år 2010
- 2010
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Ingår i: Fysikaktuellt. - 0283-9148. ; :1, s. 3-3
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Tidskriftsartikel (populärvet., debatt m.m.)
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