| 1. |
- Parafilo, A. V., et al.
(author)
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Chiral effects in normal and superconducting carbon nanotube-based nanostructures
- 2010
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In: Low Temperature Physics. - : AIP Publishing. - 1063-777X .- 1090-6517. ; 36:10/11, s. 959-968
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Journal article (peer-reviewed)abstract
- The novel phenomenon of chiral tunneling in metallic single-wall carbon nanotubes is considered. It is induced by the interplay of electrostatic and pseudomagnetic effects in electron scattering in chiral nanotubes and is characterized by an oscillatory dependence of the electron transmission probability on the nanotube chiral angle and the strength of the scattering potential. The appearance of a special (Aharonov–Bohm-like) phase in chiral tunneling affects various phase-coherent phenomena in nanostructures. We examine chiral effects in: (i) persistent currents in circular nanotubes, (ii) Josephson currents in nanotube-based SNS junctions, and (iii) resonant electron tunneling through chiral nanotube-based quantum dots.
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| 2. |
- Parafilo, A. V., et al.
(author)
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Chiral tunnelling in metallic carbon nanotubes
- 2011
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In: Physical Review B. - 1098-0121. ; 83
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Journal article (peer-reviewed)abstract
- The concept of chiral tunneling in metallic single-wall carbon nanotubes, originating from the interplay of local electrostatic and pseudomagnetic potentials, is considered and applied to an evaluation of the Josephson current in a nanotube-based superconductor–normal metal–superconductor (SNS) junction and the persistent current in a circular nanotube. In the former case, an oscillatory dependence of the critical supercurrent on the potential strength and the nanotube chiral angle is predicted. In the latter case, the existence of a spontaneous persistent current in an isolated ringlike nanotube is discussed.
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| 3. |
- Parafilo, A. V., et al.
(author)
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Manifestation of polaronic effects in Josephson currents
- 2013
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In: Low temperature physics. - : AIP Publishing. - 1063-777X .- 1090-6517. ; 39:8, s. 685-694
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Journal article (peer-reviewed)abstract
- Polaronic effects on the Josephson current through a vibrating quantum dot are considered. In the regime of strong electron-vibron interactions they lead to a power-law suppression of the critical current. This is manifested in an anomalous temperature dependence of the critical current at temperatures of the order of the polaronic energy shift.
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| 4. |
- Parafilo, A. V., et al.
(author)
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Polaronic effects and thermally enhanced weak superconductivity
- 2014
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In: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121. ; 89:11
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Journal article (peer-reviewed)abstract
- We theoretically analyze the d.c Josephson current between two superconductors connected by a vibrating weak link. Assuming the weak link to be a ``quantum dot" we predict that the critical current is thermally enhanced at low temperatures if the electron-vibron interaction is strong and has an anomalous temperature dependence in a large temperature interval. We estimate that this unusual behavior, which occurs because the current through the weak link is carried by ``polaronic" Andreev states, is measurable in experiments on, e.g., carbon-nanotube based Josepshon junctions.
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| 5. |
- Parafilo, A. V., et al.
(author)
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Superconducting phase-dependent force in SNS junctions with mobile scatterers
- 2012
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In: Low Temperature Physics. - : AIP Publishing. - 1063-777X .- 1090-6517. ; 38:4, s. 349-352
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Journal article (peer-reviewed)abstract
- We calculate the quantum (Casimir-like) superconducting phase-dependent force acting on mobile scatterers in superconductor-normal metal-superconductor (SNS) junctions. Repulsive Casimir forces are predicted in short SNS junctions with nonequilibrium (inverse) Andreev level populations. An anomalous (nonmonotonic) temperature dependence of the quantum force is found in long SNS junctions. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3697970]
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| 6. |
- Parafilo, A. V., et al.
(author)
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Thermoelectric effects in electron chiral tunneling in metallic carbon nanotubes
- 2015
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In: Superlattices and Microstructures. - : Elsevier BV. - 0749-6036. ; 88, s. 72-79
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Journal article (peer-reviewed)abstract
- Thermoelectric effects in a metallic single-wall carbon nanotube in the presence of long-range electrostatic and pseudomagnetic potentials (produced by strain) are considered. It is shown that for strong scattering potentials (chiral tunneling) a pronounced energy "gap" appears in the energy dependence of electron transmission coefficient. This results in strong violation of Wiedemann-Franz law and in a peak-like behavior of thermopower as a function of chemical potential. The electronic figure-of-merit (ZT) is calculated and shown to be sensitive at low temperatures to nanotube chirality. By tuning chemical potential, ZT can reach high values (ZT approximate to 5) that makes specially engineered nanotube-based thermocouple to be a promising nano-device with a high thermoelectric performance. (C) 2015 Elsevier Ltd. All rights reserved.
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| 7. |
- Shekhter, Robert I., 1947, et al.
(author)
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Electronic spin working mechanically (Review Article)
- 2014
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In: Low temperature physics. - : AIP Publishing. - 1063-777X .- 1090-6517. ; 40:7, s. 600-614
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Journal article (peer-reviewed)abstract
- A single-electron tunneling (SET) device with a nanoscale central island that can move with respect to the bulk source- and drain electrodes allows for a nanoelectromechanical (NEM) coupling between the electrical current through the device and mechanical vibrations of the island. Although an electromechanical “shuttle” instability and the associated phenomenon of single-electron shuttling were predicted more than 15 years ago, both theoretical and experimental studies of NEM-SET structures are still carried out. New functionalities based on quantum coherence, Coulomb correlations and coherent electron-spin dynamics are of particular current interest. In this article we present a short review of recent activities in this area.
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| 8. |
- Shekhter, Robert I., 1947, et al.
(author)
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Nanoelectromechanics of shuttle devices
- 2013
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In: Nanoelectromechanical Systems. - : Portico. - 2299-3169. ; 1, s. 1-25
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Journal article (peer-reviewed)abstract
- A single-electron tunneling (SET) device with a nanoscale central island that can move with respect to the bulk sourceand drain electrodes allows for a nanoelectromechanical (NEM) coupling between the electrical current through the device and the mechanical vibrations of the island. Although the electromechanical “shuttle” instability and the associated phenomenon of single-electron shuttling were predicted more than 15 years ago, both theoretical and experimental studies of NEM-SET structures are still carried out. New functionalities based on quantum coherence, Coulomb correlations and coherent electron-spin dynamics are still of particular interest. In this article we present a short review of recent activities in this area.
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| 9. |
- Shkop, A. D., et al.
(author)
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Low-energy anomalies in electron tunneling through strongly asymmetric Majorana nanowire
- 2016
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In: Low Temperature Physics. - : AIP Publishing. - 1063-777X .- 1090-6517. ; 42:4, s. 308-312
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Journal article (peer-reviewed)abstract
- Electron transport through Majorana nanowire with strongly asymmetric couplings to normal metal leads is considered. In three terminal geometry (electrically grounded nanowire) it is shown that the presence of unbiased electrode restores zero-bias anomaly even for strong Majorana energy splitting. For effectively two-terminal geometry we show that electrical current through asymmetric Majorana junction is qualitatively different from the analogous current through a resonant (Breit-Wigner) level. Published by AIP Publishing.
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| 10. |
- Ilinskaya, O. A., et al.
(author)
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Magnetically controlled single-electron shuttle
- 2015
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In: Low temperature physics. - : AIP Publishing. - 1063-777X .- 1090-6517. ; 41:1, s. 70-74
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Journal article (peer-reviewed)abstract
- A theory of single-electron shuttling in an external magnetic field in nanoelectromechanical system with magnetic leads is presented. We consider partially spin-polarized electrons in the leads and electron transport in both the Coulomb blockade regime and in the limit of large bias voltages when the Coulomb blockade is lifted. The influence of the degree of spin polarization on shuttle instability is considered. It is shown that there is certain degree of spin polarization above which the magnetic field ceases to control electron transport. In the Coulomb blockade regime the depend- ence of the threshold magnetic field, which separates the “shuttle” and vibron regimes, on the degree of polarization is evaluated. The possibility of re-entrant transitions to the shuttle phase is discussed.
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| 11. |
- Ilinskaya, O. A., et al.
(author)
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Shuttling of spin polarized electrons in molecular transistors
- 2016
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In: Synthetic Metals. - : Elsevier BV. - 0379-6779. ; 216, s. 83-87
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Journal article (peer-reviewed)abstract
- Shuttling of electrons in single-molecule transistors with magnetic leads in the presence of an external magnetic field is considered theoretically. For a current of partially spin-polarized electrons a shuttle instability is predicted to occur for a finite interval of external magnetic field strengths. The lower critical magnetic field is determined by the degree of spin polarization and it vanishes as the spin polarization approaches 100%. The feasibility of detecting magnetic shuttling in a C-60-based molecular transistor with magnetic (Ni) electrodes is discussed (Pasupathy et al. (2004) [7]). (C) 2015 Elsevier B.V. All rights reserved.
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| 12. |
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| 13. |
- Krive, Ilya V., et al.
(author)
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Carbon "peapods" - a new tunable nanoscale graphitic structure (Review)
- 2006
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In: Low Temperature Physics. - : AIP Publishing. - 1063-777X .- 1090-6517. ; 32:10, s. 887-905
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Journal article (peer-reviewed)abstract
- We consider the electronic properties of empty single-wall nanotubes (SWNT) and SWNT filled with fullerene molecules (carbon "nano-peapods"). The first part of the review (See. 11) is devoted mostly to the Luttinger liqued properties of individual metallic SWNT coupled to metallic electrodes or to superconducting leads. The discovery of carbon "nano-peapods" and their elastic, electric and thermal properties are reviewed in the second part of the paper (See. 111). We suggest in particular how fullerene and metallofullerene molecules can be released from a "nano-peapod" by a purely electrostatic method. (c) 2006 American Institute of Physics.
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| 14. |
- Krive, Ilya V., et al.
(author)
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Charge and spin effects in mesoscopic Josephson junctions
- 2004
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In: Fizika Nizkikh Temperatur (Kharkov). - 0132-6414. ; 30, s. 554-
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Journal article (peer-reviewed)abstract
- We consider the charge and spin effects in low dimensional superconducting weak, links. The first part of the review deals with the effects of electron - electron interaction in Superconductor/Luttlnger liquid/Superconductor junctions. The experimental realization of this mesoscopic hybrid system can be the individual single wall carbon nanotube that bridges the gap between two bulk superconductors. The dc Josephson current through a Luttinger liquid is evaluated in the limits of perfectly and poorly transmitting junctions. The relationship between the Josephson effect in a long SNS junction and the Casimir effect is discussed. In the second part of the paper we review the recent results concerning the influence of the Zeeman and Rashba interactions on the thermodynamical properties of ballistic S-QW-S junction fabricated in two dimensional electron gas. It is shown that in magnetically controlled junction there are conditions for resonant Cooper pair transition which results in giant supercurrent through a tunnel junction and a giant magnetic response of a multichannel SNS junction. The supercurrent induced by the joint action of the Zeeman and Rashba interactions in 1D quantum wires connected to bulk superconductors is predicted.
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| 15. |
- Krive, Ilya V., et al.
(author)
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Chiral symmetry breaking and the Josephson current in a ballistic superconductor-quantum wire-superconductor junction
- 2004
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In: Fizika Nizkikh Temperatur. - : AIP Publishing. - 0132-6414 .- 1816-0328. ; 30:5, s. 398-404
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Journal article (peer-reviewed)abstract
- We evaluate the Josephson current through a quasi-1D quantum wire coupled to bulk superconductors. It Is shown that the interplay of Rashba spin-orbit interaction and Zeeman splitting results in the appearence of a Josephson current even in the absence of any phase difference between the superconductors. In a transparent junction (D [asymptotically equal to] 1) at low temperatures this anomalous supercurrent Jan appears abruptly for a Zeeman splitting of the order of the Andreev level spacing as the magnetic field is varied. In a low transparency (D very much less than 1) junction one has Jan α root D under special (resonance) conditions. In the absence of Zeeman splitting the anomalous supercurrent disappears. We have investigated the influence of dispersion asymmetry induced by the Rashba interaction in quasi-1D quantum wires on the critical Josephson current and have shown that the breakdown of chiral symmetry enhances the supercurrent.
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| 16. |
- Krive, Ilya V., et al.
(author)
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Influence of the Rashba effect on the Josephson current through a superconductor/luttinger liquid/superconductor tunnel junction
- 2005
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In: Physical Review B (Condensed Matter and Materials Physics). - 0163-1829. ; 71:21, s. 214516-1
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Journal article (peer-reviewed)abstract
- The Josephson current through a one-dimensional quantum wire with Rashba spin-orbit and electron-electron interactions is calculated. We show that the interplay of Rashba and Zeeman interactions gives rise to an anomalous phase shift in the current-phase relation for the supercurrent. The electron dispersion asymmetry induced by the Rashba interaction in a Luttinger-liquid wire plays a significant role when the electron-electron interaction is not strong and for poorly transmitting junctions. It is shown that for a weak or moderate electron-electron interaction the spectrum of plasmonic modes confined to the normal part of the junction becomes quasi-random in the presence of dispersion asymmetry. The resonance effects which are significant for transport properties of weakly interacting electrons in symmetric junctions survive in the presence of a strong Rashba interaction only for special boundary conditions at normal metal/superconductor interfaces
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| 17. |
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| 18. |
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| 19. |
- Krive, Ilya V., et al.
(author)
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Resonant tunneling of electrons in quantum wires
- 2010
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In: Low Temperature Physics. - : AIP Publishing. - 1063-777X .- 1090-6517. ; 36:2, s. 119-141
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Research review (peer-reviewed)abstract
- We consider resonant electron tunneling in various nanostructures, including single-wall carbon nanotubes, molecular transistors, and quantum wires, formed in two-dimensional electron gas. The review starts with a textbook description of resonant tunneling of noninteracting electrons through a double-barrier structure. The effects of electron-electron interaction in sequential and resonant electron tunneling are studied by using the Luttinger liquid model of electron transport in quantum wires. The experimental aspects of the problem (fabrication of quantum wires and transport measurements) are also considered. The influence of vibrational and electromechanical effects on resonant electron tunneling in molecular transistors is discussed.
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| 20. |
- Krive, Ilya V., et al.
(author)
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The influence of electro-mechanical effects on resonant electron tunneling through small carbon nano-peapods
- 2008
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In: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 10
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Journal article (peer-reviewed)abstract
- The influence of a fullerene molecule trapped inside a single-wall carbon nanotube on resonant electron transport at low temperatures and strong polaronic coupling is theoretically discussed. Strong peak-to-peak fluctuations and anomalous temperature behavior of conductance amplitudes are predicted and investigated. The influence of the chiral properties of carbon nanotubes on transport is also studied.
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| 21. |
- Kulinich, Sergeij I., et al.
(author)
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Single-Electron Shuttle Based on Electron Spin
- 2014
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In: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 112:11
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Journal article (peer-reviewed)abstract
- A nanoelectromechanical device based on magnetic exchange forces and electron spin flips induced by a weak external magnetic field is suggested. It is shown that this device can operate as a new type of single-electron "shuttle" in the Coulomb blockade regime of electron transport.
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| 22. |
- Parafilo, A., et al.
(author)
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Nanoelectromechanics of superconducting weak links
- 2012
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In: Low Temperature Physics. - : AIP Publishing. - 1063-777X .- 1090-6517. ; 38:4, s. 273-282
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Journal article (peer-reviewed)abstract
- Nanoelectromechanical effects in superconducting weak links are considered. Three different superconducting devices are studied: (i) a single-Cooper-pair transistor, (ii) a transparent SNS junction, and (iii) a single-level quantum dot coupled to superconducting electrodes. The electromechanical coupling is due to electrostatic or magnetomotive forces acting on a movable part of the device. It is demonstrated that depending on the frequency of mechanical vibrations the electromechanical coupling could either suppress or enhance the Josephson current. Nonequilibrium effects associated with cooling of the vibrational subsystem or pumping energy into it at low bias voltages are discussed.
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| 23. |
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| 24. |
- Skorobagatko, G. A., et al.
(author)
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Magnetopolaronic effects in electron transport through a single-level vibrating quantum dot
- 2011
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In: Low Temperature Physics. - 1063-777X. ; 37:12, s. 1032-1037
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Journal article (peer-reviewed)abstract
- Magnetopolaronic effects are considered in electron transport through a single-level vibrating quantum dot subjected to a transverse (to the current flow) magnetic field. It is shown that the effects are most pronounced in the regime of sequential electron tunneling, where a polaronic blockade of the current at low temperatures and an anomalous temperature dependence of the magnetoconductance are predicted. In contrast, for resonant tunneling of polarons the peak conductance is not affected by the magnetic field.
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| 25. |
- Skorobagatko, Gleb A., et al.
(author)
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Polaronic effects in electron shuttling
- 2009
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In: LOW TEMPERATURE PHYSICS. - : AIP Publishing. - 1063-777X .- 1090-6517. ; 35:12, s. 949-956
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Journal article (peer-reviewed)
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| 26. |
- Utko, P., et al.
(author)
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Coupling between electronic and vibrational excitations in carbon nanotubes filled with C(60) fullerenes
- 2011
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In: Acta Physica Polonica A. - 0587-4246. ; 120:5, s. 839-841
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Journal article (peer-reviewed)abstract
- We investigate the low-temperature electron transport through C60 peapods, which are carbon nanotubes encapsulating C60 fullerenes. We find that the temperature dependence of the Coulomb blockade oscillations in peapod quantum dots deviates from conventional Breit–Wigner behavior, showing signatures of the Franck–Condon blockade of conductance. This indicates the presence of a coupling between electronic states and vibrational excitations. Unlike for suspended empty nanotubes, these are not intrinsic vibrational modes of the tube but mechanical vibrations of the encapsulated fullerenes that affect the electronic transport. Fullerene peapods thus emerge as a new class of nanoelectromechanical systems.
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| 27. |
- Utko, Pawel, et al.
(author)
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Nanoelectromechanical coupling in fullerene peapods probed by resonant electrical transport experiments
- 2010
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In: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 1
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Journal article (peer-reviewed)abstract
- Fullerene peapods, which are carbon nanotubes encapsulating fullerene molecules, can offer enhanced functionality with respect to empty nanotubes. Their prospective applications include, for example, data storage devices, single-electron transistors and spin-qubit arrays for quantum computing. However, the present incomplete understanding of how a nanotube is affected by entrapped fullerenes is an obstacle for peapods to reach their full potential in nanoscale electronic applications. In this paper, we investigate the effect of C60 fullerenes on low-temperature electron transport through peapod quantum dots. Compared with empty nanotubes, we find an abnormal temperature dependence of Coulomb blockade oscillations, indicating the presence of a nanoelectromechanical coupling between electronic states of the nanotube and mechanical vibrations of fullerenes. This provides a method to detect the C60 presence and to probe the interplay between electrical and mechanical excitations in peapods, which thus emerge as a new class of nanoelectromechanical systems.
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