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Статті в журналах з теми "Spin polarized electron gas":
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LU, MAOWANG. "VOLTAGE-TUNABLE SPIN POLARIZATION OF TWO-DIMENSIONAL ELECTRON GAS IN FERROMAGNETIC/SEMICONDUCTOR HYBRID NANOSYSTEM." Surface Review and Letters 13, no. 05 (October 2006): 599–605. http://dx.doi.org/10.1142/s0218625x06008554.
The spin-dependent electron transport in a two-dimensional electron gas (2DEG) modulated by a stripe of magnetized ferromagnetic metal under an applied voltage was investigated theoretically. It is revealed that highly spin-polarized current can be achieved in this kind of nanosystems. It is also shown that the spin polarity of the electron transport can be switched by adjusting the applied voltage to the stripe in the device. These interesting properties may provide an alternative scheme to spin polarize electrons into semiconductors, and this device may be used as a voltage-tunable spin filter.
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Baboux, F., F. Perez, C. A. Ullrich, G. Karczewski, and T. Wojtowicz. "Spin-orbit stiffness of the spin-polarized electron gas." physica status solidi (RRL) - Rapid Research Letters 10, no. 4 (February 25, 2016): 315–19. http://dx.doi.org/10.1002/pssr.201600032.
Valizadeh, Mohammad M., and Sashi Satpathy. "RKKY interaction for the spin-polarized electron gas." International Journal of Modern Physics B 29, no. 30 (November 18, 2015): 1550219. http://dx.doi.org/10.1142/s0217979215502197.
We extend the original work of Ruderman, Kittel, Kasuya and Yosida (RKKY) on the interaction between two magnetic moments embedded in an electron gas to the case where the electron gas is spin-polarized. The broken symmetry of a host material introduces the Dzyaloshinsky–Moriya (DM) vector and tensor interaction terms, in addition to the standard RKKY term, so that the net interaction energy has the form [Formula: see text]. We find that for the spin-polarized electron gas, a nonzero tensor interaction [Formula: see text] is present in addition to the scalar RKKY interaction [Formula: see text], while [Formula: see text] is zero due to the presence of inversion symmetry. Explicit expressions for these are derived for the electron gas both in 2D and 3D and we show that the net magnetic interaction can be expressed as a sum of Heisenberg and Ising like terms. The RKKY interaction exhibits a beating pattern, caused by the presence of the two Fermi momenta [Formula: see text] and [Formula: see text], while the [Formula: see text] distance dependence of the original RKKY result for the 3D electron gas is retained. This model serves as a simple example of the magnetic interaction in systems with broken symmetry, which goes beyond the RKKY interaction.
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Yi, K. S., and J. J. Quinn. "Charge and spin response of the spin-polarized electron gas." Physical Review B 54, no. 19 (November 15, 1996): 13398–401. http://dx.doi.org/10.1103/physrevb.54.13398.
Govorov, A. O., and A. V. Chaplik. "Inelastic light scattering by spin polarized electron gas." Solid State Communications 85, no. 9 (March 1993): 827–28. http://dx.doi.org/10.1016/0038-1098(93)90679-h.
Fomin, Igor Vadimovich, and Pavel Vasilievich Sasorov. "Relaxation of spin-polarized low-density electron gas." Keldysh Institute Preprints, no. 67 (2017): 1–23. http://dx.doi.org/10.20948/prepr-2017-67.
Quantum scars refer to an enhanced localization of the probability density of states in the spectral region with a high energy level density. Scars are discussed for a number of confined pure and impurity-doped electronic systems. Here, we studied the role of spin on quantum scarring for a generic system, namely a semiconductor-heterostructure-based two-dimensional electron gas subjected to a confining potential, an external magnetic field, and a Rashba-type spin-orbit coupling. Calculating the high energy spectrum for each spin channel and corresponding states, as well as employing statistical methods known for the spinless case, we showed that spin-dependent scarring occurs in a spin-coupled electronic system. Scars can be spin mixed or spin polarized and may be detected via transport measurements or spin-polarized scanning tunneling spectroscopy.
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Tereshchenko, Oleg E., Vladimir A. Golyashov, Vadim S. Rusetsky, Andrey V. Mironov, Alexander Yu Demin, and Vladimir V. Aksenov. "A new imaging concept in spin polarimetry based on the spin-filter effect." Journal of Synchrotron Radiation 28, no. 3 (March 30, 2021): 864–75. http://dx.doi.org/10.1107/s1600577521002307.
The concept of an imaging-type 3D spin detector, based on the combination of spin-exchange interactions in the ferromagnetic (FM) film and spin selectivity of the electron–photon conversion effect in a semiconductor heterostructure, is proposed and demonstrated on a model system. This novel multichannel concept is based on the idea of direct transfer of a 2D spin-polarized electron distribution to image cathodoluminescence (CL). The detector is a hybrid structure consisting of a thin magnetic layer deposited on a semiconductor structure allowing measurement of the spatial and polarization-dependent CL intensity from injected spin-polarized free electrons. The idea is to use spin-dependent electron transmission through in-plane magnetized FM film for in-plane spin detection by measuring the CL intensity from recombined electrons transmitted in the semiconductor. For the incoming electrons with out-of-plane spin polarization, the intensity of circularly polarized CL light can be detected from recombined polarized electrons with holes in the semiconductor. In order to demonstrate the ability of the solid-state spin detector in the image-type mode operation, a spin detector prototype was developed, which consists of a compact proximity focused vacuum tube with a spin-polarized electron source [p-GaAs(Cs,O)], a negative electron affinity (NEA) photocathode and the target [semiconductor heterostructure with quantum wells also with NEA]. The injection of polarized low-energy electrons into the target by varying the kinetic energy in the range 0.5–3.0 eV and up to 1.3 keV was studied in image-type mode. The figure of merit as a function of electron kinetic energy and the target temperature is determined. The spin asymmetry of the CL intensity in a ferromagnetic/semiconductor (FM-SC) junction provides a compact optical method for measuring spin polarization of free-electron beams in image-type mode. The FM-SC detector has the potential for realizing multichannel 3D vectorial reconstruction of spin polarization in momentum microscope and angle-resolved photoelectron spectroscopy systems.
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Rassolov, Vitaly A., John A. Pople, and Mark A. Ratner. "Correlation holes in a spin-polarized dense electron gas." Physical Review B 59, no. 24 (June 15, 1999): 15625–31. http://dx.doi.org/10.1103/physrevb.59.15625.
Valizadeh, Mohammad Mahdi, and Sashi Satpathy. "Magnetic exchange interaction in the spin-polarized electron gas." physica status solidi (b) 253, no. 11 (September 8, 2016): 2245–51. http://dx.doi.org/10.1002/pssb.201600188.
Kato, Takashi, Yasuhito Ishikawa, Hiroyoshi Itoh, and Jun-ichiro Inoue. "Intrinsic anisotropic magnetoresistance in spin-polarized two-dimensional electron gas with Rashba spin-orbit interaction." American Physical Society, 2008. http://hdl.handle.net/2237/11252.
Zhou, Haosheng. "Theory of the magnetic resonance spectrum of spin-polarized hydrogen gas." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26678.
The Green's function method is applied to investigate the magnetic spin resonance spectra of three-dimensional and two-dimensional spin-polarized quantum gases.
The Hartree-Fock approximation is employed to calculate the one-particle Green's function of the atoms, then this one-particle Green's function is used for the calculation of the vertex part of the Green's function. Such a combination yields a self-consistent result. The absorption spectra are obtained from the calculation of the susceptibility in terms of the two-particle Green's function (bubble diagram). Some general expressions for the dispersion relation, for the effective mass of a spin wave, and for the dipolar frequency shift are given in the calculation.
In order to estimate the shift of the electron-spin-resonance (ESR) frequency, the effective dipole-dipole interactions among the hydrogen atoms are included in the calculation. These effective interactions are deduced from the ladder approximation, and hence are characterized by the scattering amplitude. The scattering amplitude is calculated numerically. The result shows that the theoretical value of the shift is smaller than the experimentally observed value by about 35%. Science, Faculty of Physics and Astronomy, Department of Graduate
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Sadeghzadeh, Kayvan. "Spin polarised Fermi gases." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610744.
Thesis (Ph. D.)--University of California, Riverside, 2009. Includes abstract. Includes bibliographical references (leaves 121-123). Issued in print and online. Available via ProQuest Digital Dissertations.
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Kuwahara, M., T. Morino, T. Nakanishi, S. Okumi, M. Yamamoto, M. Miyamoto, N. Yamamoto, et al. "Spin-Polarized Electrons Extracted from GaAs Tips using Field Emission." American Institite of Physics, 2007. http://hdl.handle.net/2237/11993.
Hatton, D. C. "Spin polarized electron scattering at ferromagnetic interfaces." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.603854.
Buckle, S. J. "Molecular field effects in electron spin polarized atomic deuterium." Thesis, University of Sussex, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372071.
Mohamad, Haidar Jawad. "Ultrafast optical measurements of spin-polarized electron dynamics in nanostructured magnetic materials." Thesis, University of Exeter, 2015. http://hdl.handle.net/10871/18425.
At present, electronic devices depend upon electric charge to transfer and record information. However, such devices are approaching a scaling limit due to Joule heating. Spintronics offers a solution by exploiting the spin rather than the charge of the electron, since the propagation of spin current can in principle occur without dissipation. Immediate applications lie in magnetic random access memory and novel media for hard disk recording. Within this thesis, the Magneto-optical Kerr effect (MOKE) has been used to measure the static and dynamic magnetic properties of a number of different thin film samples that are of interest for spintronic applications. A femtosecond laser has been used to perform time-resolved MOKE (TRMOKE) and time resolved reflectivity (TRR) measurements simultaneously, which probe the spin and charge dynamics respectively. Measurements have been performed upon a continuous thin film of CrO2 that is known to be half-metallic in bulk form, and a series of YIG/Cu/Ni81Fe19 based structures that are expected to exhibit the spin Seebeck effect (SSE). Chemical vapour deposition (CVD) was used to fabricate the continuous CrO2 thin film on a (100)-oriented TiO2 substrate. Precessional magnetisation dynamics were studied by means of the TRMOKE technique. The dependence of the precession frequency and the effective damping parameter upon the static applied magnetic field were investigated. The precession frequency exhibited a minimum at the hard axis saturation field as expected. However precession was also observed for fields greater than the hard axis saturation value, perhaps suggesting the presence of a twisted magnetic state within the film. TRMOKE and TRR measurements were performed upon the YIG/Cu/Ni81Fe19 based structures for different values of the pump fluence and applied magnetic field. For fixed pump fluence and varying applied field, the frequency of precession is well described by a numerical solution of the Landau-Lifshitz equation for the Ni81Fe19 (permalloy, Py) layer. The frequency, amplitude, damping, phase and chirp of the precessional oscillations was extracted from measurements made with a field of 3 kOe applied at 2.8° from the normal to the sample plane, in a configuration designed to maximise any spin transfer torque (STT) generated by the SSE. The oscillation parameters extracted for trilayer samples and a Py reference sample were found to be very similar. Features indicative of STT predicted by simulations were not observed. This suggests that either the YIG/Cu interface was unable to efficiently transmit spin current within the samples studied here, or else that the STT generated by means of the SSE is too small to be of practical use.
Samarin, Sergey, Oleg Artamonov, and Jim Williams. Spin-Polarized Two-Electron Spectroscopy of Surfaces. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-00657-0.
SPIN 2004 (2004 Trieste, Italy). SPIN 2004: Proceedings of the 16th International Spin Physics Symposium and Workshop on Polarized Electron Sources and Polarimeters, Trieste, Italy, 10-16 October 2004. Edited by Bradamante F and Workshop on Polarized Electron Sources and Polarimeters (2004 : Trieste, Italy). Hackensack, N.J: World Scientific, 2005.
International, Spin Physics Symposium (15th 2002 Upton N. Y. ). Spin 2002: 15th International Spin Physics Symposium, Upton, New York, 9-14 September 2002 and, Workshop on Polarized Electron Sources and Polarimeters, Danvers, Massachusetts 4-6 September 2002. Melville, N.Y: American Institute Of Physics, 2003.
Hirohata, A., and J. Y. Kim. Optically Induced and Detected Spin Current. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198787075.003.0006.
This chapter presents an alternative method of injecting spin-polarized electrons into a nonmagnetic semiconductor through photoexcitation. This method uses circularly-polarized light, whose energy needs to be the same as, or slightly larger than, the semiconductor band-gap, to excite spin-polarized electrons. This process will introduce a spin-polarized electron-hole pair, which can be detected as electrical signals. Such an optically induced spin-polarized current can only be generated in a direct band-gap semiconductor due to the selection rule described in the following sections. This introduction of circularly polarized light can also be used for spin-polarized scanning tunnelling microscopy.
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Samarin, Sergey, Oleg Artamonov, and Jim Williams. Spin-Polarized Two-Electron Spectroscopy of Surfaces. Springer, 2019.
This chapter explains how the exchange splitting between up- and down-spin bands in ferromagnets unexceptionally generates spin-polarized electronic states at the Fermi energy. The quantity of spin polarization P in ferromagnets is one of the important parameters for application in spintronics, since a ferromagnet having a higher P is able to generate larger various spin-dependent effects such as the magnetoresistance effect, spin transfer torque, spin accumulation, and so on. However, the spin polarizations of general 3d transition metals or alloys generally limit the size of spin-dependent effects. Thus,“‘half-metals” attract much interest as an ideal source of spin current and spin-dependent scattering because they possess perfectly spin-polarized conduction electrons due to the energy band gap in either the up- or down-spin channel at the Fermi level.
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Aulenbacher, Kurt, Italy) Spin 200 (2004 Trieste, and Workshop on Polarized Electron Sources A. Spin 2004: 16th International Spin Physics Symposium; Workshop On Polerized Electron Sources and Polarimeters. World Scientific Publishing Company, 2005.
Частини книг з теми "Spin polarized electron gas":
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Nakanishi, T., and S. Nakamura. "Development of Polarized Electron Source of GaAs-AlGaAs Superlattice and Strained GaAs." In High Energy Spin Physics, 30–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-76661-9_7.
Testelin, C., A. Lemaître, C. Rigaux, T. Wojtowicz, G. Karczewski, and F. Teran. "Magnetooptical Evidence of Many-body Effects in Spin-polarized 2D Electron Gas." In Springer Proceedings in Physics, 551–52. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-59484-7_260.
Robins, J. L. "Spin Polarized Electron Techniques." In Springer Series in Surface Sciences, 301–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-662-02767-7_15.
Walters, H. R. J. "Theory of Electron Spin Effects in Electron-Atom Scattering." In Polarized Electron/Polarized Photon Physics, 37–60. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4899-1418-7_3.
Hardiman, M., I. R. M. Wardell, M. S. Bhella, M. Whitehouse-Yeo, P. Gendrier, C. J. Harland, G. Roussel, et al. "Spin Polarized Electron Detectors for Surface Magnetism." In Polarized Electron/Polarized Photon Physics, 147–58. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4899-1418-7_10.
Clendenin, J. E. "The SLC Polarized Electron Source." In High Energy Spin Physics, 3–7. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-76661-9_1.
Essabaa, S., C. G. Aminoff, J. Arianer, and I. Brissaud. "The Orsay Polarized Electron Source." In High Energy Spin Physics, 8–11. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-76661-9_2.
Chaudhry, Muhammad Afzal, and Hans Kleinpoppen. "Resonance Line Radiation from Spin Polarized Sodium and Potassium Atoms." In Polarized Electron/Polarized Photon Physics, 159–67. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4899-1418-7_11.
Mason, N. J. "Spin Dependent Electron Scattering from Oriented Molecules: An Experimental Appraisal." In Polarized Electron/Polarized Photon Physics, 209–23. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4899-1418-7_16.
Тези доповідей конференцій з теми "Spin polarized electron gas":
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Perez, Florent. "Whole Spectrum Of The Spin Polarized Two Dimensional Electron Gas." In PHYSICS OF SEMICONDUCTORS: 27th International Conference on the Physics of Semiconductors - ICPS-27. AIP, 2005. http://dx.doi.org/10.1063/1.1994586.
Kim, Jae-Seok, Sungkyun Park, Kyung-Soo Yi, Jisoon Ihm, and Hyeonsik Cheong. "Correlation Effects on ‘Electron—Test Charge’ Dielectric Functions of a Spin-polarized Electron Gas." In PHYSICS OF SEMICONDUCTORS: 30th International Conference on the Physics of Semiconductors. AIP, 2011. http://dx.doi.org/10.1063/1.3666564.
Perez, F., C. Aku-Leh, B. Jusserand, D. Richards, and G. Karczewski. "Spin Susceptibility Enhancement of a Spin Polarized Two Dimensional Electron Gas Determined by Raman Spectroscopy." In PHYSICS OF SEMICONDUCTORS: 28th International Conference on the Physics of Semiconductors - ICPS 2006. AIP, 2007. http://dx.doi.org/10.1063/1.2730376.
Rathmann, F. "The Polarized Internal Gas Target of ANKE at COSY." In SPIN 2002: 15th International Spin Physics Symposium and Workshop on Polarized Electron Sources and Polarimeters. AIP, 2003. http://dx.doi.org/10.1063/1.1607270.
Ruzicka, Brian A., Lalani K. Werake, Hui Zhao, Matt Mover, and G. Vignale. "Spin-Polarized Electron Transport in GaAs: Role of Holes." In Conference on Lasers and Electro-Optics. Washington, D.C.: OSA, 2009. http://dx.doi.org/10.1364/cleo.2009.jwa117.
Singh, Gurvinder, Krishan Kumar, Vinayak Garg, and R. K. Moudgil. "Dynamical correlation effects on structure factor of spin-polarized two-dimensional electron gas." In NANOFORUM 2014. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4917929.
Arora, Priya, Krishan Kumar, and R. K. Moudgil. "Role of temperature on static correlational properties in a spin-polarized electron gas." In INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2015): Proceeding of International Conference on Condensed Matter and Applied Physics. Author(s), 2016. http://dx.doi.org/10.1063/1.4946732.
Kumar, Krishan, Vinayak Garg, and R. K. Moudgil. "Dynamical correlation effects on pair-correlation functions of spin polarized two-dimensional electron gas." In PROCEEDING OF INTERNATIONAL CONFERENCE ON RECENT TRENDS IN APPLIED PHYSICS AND MATERIAL SCIENCE: RAM 2013. AIP, 2013. http://dx.doi.org/10.1063/1.4810544.
Engels, R. "A Precision Lamb-shift Polarimeter for the Polarized Gas Target at ANKE/COSY." In SPIN 2002: 15th International Spin Physics Symposium and Workshop on Polarized Electron Sources and Polarimeters. AIP, 2003. http://dx.doi.org/10.1063/1.1607264.
GRIGORIEV, K., R. ENGELS, A. GUSSEN, P. JANSEN, H. KLEINES, F. KLEHR, P. KRAVTSOV, et al. "THE POLARIZED INTERNAL GAS TARGET OF ANKE AT COSY." In Proceedings of the 16th International Spin Physics Symposium and Workshop on Polarized Electron Sources and Polarimeters. WORLD SCIENTIFIC, 2005. http://dx.doi.org/10.1142/9789812701909_0172.
Звіти організацій з теми "Spin polarized electron gas":
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D.L. Mills. Spin Polarized Electron Probes and Magnetic Nanostructures. Office of Scientific and Technical Information (OSTI), October 2003. http://dx.doi.org/10.2172/816290.
Clendenin, James E. Spin-Polarized Electron Transport and Emission from Strained Superlattices. Office of Scientific and Technical Information (OSTI), July 1999. http://dx.doi.org/10.2172/10104.
Subashiev, A. Spin polarized electron transport and emission from strained semiconductor heterostructures. Office of Scientific and Technical Information (OSTI), February 2000. http://dx.doi.org/10.2172/753305.
Clendenin, James E. Spin-Polarized Electron Emission from Superlattices with Zero Conduction Band Offset. Office of Scientific and Technical Information (OSTI), November 1998. http://dx.doi.org/10.2172/9958.
Danilov, V., V. Ptitsyn, and T. Gorlov. Creating intense polarized electron beam via laser stripping and spin-orbit interaction. Office of Scientific and Technical Information (OSTI), December 2010. http://dx.doi.org/10.2172/1013524.
Waddill, G. D., and R. F. Willis. A revolutionary rotatable electron energy analyzer for advanced high-resolution spin-polarized photoemission studies. Final Report. Office of Scientific and Technical Information (OSTI), October 1999. http://dx.doi.org/10.2172/821139.
Das, Tanmoy. Interaction induced staggered spin-orbit order in two-dimensional electron gas. Office of Scientific and Technical Information (OSTI), June 2012. http://dx.doi.org/10.2172/1043015.
Jones, C. E., J. A. Fedchak, and R. S. Kowalczyk. Electron-deuteron scattering with a polarized deuterium gas target in the VEPP-3 electron storage ring. Office of Scientific and Technical Information (OSTI), August 1995. http://dx.doi.org/10.2172/166413.
Yang, Luyi. Doppler Velocimetry of Current Driven Spin Helices in a Two-Dimensional Electron Gas. Office of Scientific and Technical Information (OSTI), May 2013. http://dx.doi.org/10.2172/1171503.
Weber, Christopher Phillip. Optical Transient-Grating Measurements of Spin Diffusion andRelaxation in a Two-Dimensional Electron Gas. Office of Scientific and Technical Information (OSTI), January 2005. http://dx.doi.org/10.2172/877338.
