| 1. |
- Kadigrobov, Anatoli M., 1937, et al.
(author)
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Hot electrons in magnetic point contacts as a photon source
- 2011
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In: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 13
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Journal article (peer-reviewed)abstract
- We propose to use a point contact between a ferromagnetic and a normal metal in the presence of a magnetic field for creating a large inverted spin population of hot electrons in the contact core. The key point of the proposal is that when these hot electrons relax by flipping their spin, microwave photons are emitted, with a frequency tunable by the applied magnetic field. While point contacts are an established technology, their use as a photon source is a new and potentially very useful application. We show that this photon emission process can be detected by means of transport spectroscopy and demonstrate stimulated emission of radiation in the 10–100 GHz range for a model point contact system using a minority-spin ferromagnetic injector. These results can potentially lead to new types of lasers based on spin injection in metals.
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| 2. |
- Gorelik, Leonid, 1952, et al.
(author)
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Coulomb promotion of spin-dependent tunneling
- 2005
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In: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 95:11
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Journal article (peer-reviewed)abstract
- We study transport of spin-polarized electrons through a magnetic single-electron transistor (SET) in the presence of an external magnetic field. Assuming the SET to have a nanometer size central island with a single-electron level we find that the interplay on the island between coherent spin-flip dynamics and Coulomb interactions can make the Coulomb correlations promote rather than suppress the current through the device. We find the criteria for this new phenomenon-Coulomb promotion of spin-dependent tunneling-to occur. © 2005 The American Physical Society.
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| 3. |
- Gorelik, Leonid, 1952, et al.
(author)
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Giant shot noise due to mechanical transportation of spin-polarized electrons
- 2008
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In: Physical Review B. - 1098-0121. ; 77:17, s. 174304-
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Journal article (peer-reviewed)abstract
- We show that single-electron "shuttling" of electrons in a magnetic nanoelectromechanical single-electron transistor device can be an efficient tool for studying electron spin-flip relaxation on quantum dots. The reason is traced to a spin blockade of the mechanically aided shuttle current that occurs in devices with highly polarized and collinearly magnetized leads. This results in giant peaks in the shot-noise spectral function, wherein the peak heights are only limited by the rate of electronic spin flips. Therefore, we show that nanomechanical spectroscopy of the spin-flip rate is possible, allowing spin-flip relaxation times as long as 10 mu s to be detected.
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| 4. |
- Gorelik, Leonid, 1952, et al.
(author)
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Giant super poissonian shot noise in spin-polarized SET structures
- 2007
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In: Low Temperature Physics. ; 33:9, s. 757-761
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Journal article (peer-reviewed)abstract
- We study transport of spin-polarized electrons through a magnetic single-electron transistor (SET) in the presence of an external magnetic field. Assuming the SET to have a nanometer-sized central island with a single electron level, we find that the zero-frequency shot noise diverges as the on-dot spin-flip rate goes to zero, provided the source and drain leads are completely polarized in the same direction. We present an analytical expression for the low-frequency super-Poissonian shot noise that allows one to specify the necessary conditions for the experimental observation of the phenomenon. (c) 2007 American Institute of Physics.
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| 5. |
- Gorelik, Leonid, 1952, et al.
(author)
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Mechanically assisted spin-dependent transport of electrons
- 2005
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In: Physical Review B (Condensed Matter and Materials Physics). - 0163-1829. ; 71:3, s. 35327-1
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Journal article (peer-reviewed)abstract
- Spin-dependent tunneling of electrons through magnetic nanostructures containing a mechanically movable quantum dot is considered. It is shown that the mechanically assisted current can be made strongly sensitive to an external magnetic field, leading to a giant magnetotransmittance effect for weak external fields of order 1-10 Oe
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| 6. |
- Gorelik, Leonid, 1952, et al.
(author)
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Shot noise spectroscopy of electronic spin flips in quantum dots
- 2007
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In: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 90:19
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Journal article (peer-reviewed)abstract
- Spin decoherence and spin flips crucially affect the tunneling transport of spin-polarized electrons through a quantum dot connected to magnetic leads. Here, the authors show that the low-frequency shot noise in such structures diverges as the spin relaxation rate for electrons on the dot goes to zero, reaching giant super-Poissonian values for realistic spin-flip rates. It is also shown that combined measurements of the average current and the shot noise as a function of bias voltage and external magnetic field offer a spectroscopic tool for studying electronic spin relaxation rates in this system.
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| 7. |
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| 8. |
- 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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| 9. |
- Kadigrobov, Anatoli M., 1937, et al.
(author)
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Giant lasing effect in magnetic point contacts and its detection by DC electrical measurements
- 2011
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In: Proc. of SPIE. - 0277-786X. - 9780819484703 ; 7933
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Conference paper (peer-reviewed)abstract
- We propose a new principle for a compact solid-state laser in 1-100 THz regime based on a new mechanism for creating spin-flip processes in ferromagnetic conductors. On the base of this mechanism, a giant lasing effect is predicted. The optical gain is estimated to exceed the optical gain of conventional semiconductor lasers by 4 or 5 orders of magnitude. We propose to use a point contact between ferromagnetic metals in order to create an inverted spin-population of hot electrons in the contact region. While point contact spectroscopy is an established technology the use of magnetic point contacts as a photon source is a new and potentially very useful application. We show that the generated photons conveniently can be detected by measuring the current through the illuminated point contact.
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| 10. |
- Kadigrobov, Anatoli M., 1937, et al.
(author)
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Joule heating and current-induced instabilities in magnetic nanocontacts
- 2006
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In: Physical Review B. - 1098-0121 .- 1550-235X. ; 74:19
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Journal article (peer-reviewed)abstract
- We consider the electrical current through a magnetic point contact in the limit of a strong inelastic scattering of electrons. In this limit local Joule heating of the contact region plays a decisive role in determining the transport properties of the point contact. We show that if an applied constant bias voltage exceeds a critical value, the stationary state of the system is unstable, and that periodic, nonharmonic oscillations in time of both the electrical current through the contact and the local temperature in the contact region develop spontaneously. Our estimations show that the necessary experimental conditions for observing such oscillations with characteristic frequencies in the range 10(8)-10(9) Hz can easily be met. We also show a possibility to manipulate upon the magnetization direction of a magnetic grain coupled through a point contact to a bulk ferromagnet by exciting the above-mentioned thermal-electric oscillations.
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