The Experts below are selected from a list of 24558 Experts worldwide ranked by ideXlab platform
U Zulicke - One of the best experts on this subject based on the ideXlab platform.
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Rashba spin splitting in Quantum Wires
Solid State Communications, 2020Co-Authors: Michele Governale, U ZulickeAbstract:This article presents an overview of results pertaining to electronic structure, transport properties, and interaction effects in ballistic Quantum Wires with Rashba spin splitting. Limits of weak and strong spin--orbit coupling are distinguished, and spin properties of the electronic states elucidated. The case of strong Rashba spin splitting where the spin--precession length is comparable to the wire width turns out to be particularly interesting. Hybridization of spin--split Quantum--wire subbands leads to an unusual spin structure where the direction of motion for electrons can fix their spin state. This peculiar property has important ramifications for linear transport in the Quantum wire, giving rise to spin accumulation without magnetic fields or ferromagnetic contacts. A description for interacting Rashba--split Quantum Wires is developed, which is based on a generalization of the Tomonaga--Luttinger model.Comment: 16 pages, 7 figures, to appear in Solid State Communication
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zeeman splitting in ballistic hole Quantum Wires
Physical Review Letters, 2006Co-Authors: R Danneau, David A. Ritchie, O Klochan, W R Clarke, L H Ho, A P Micolich, M Y Simmons, A R Hamilton, M Pepper, U ZulickeAbstract:: We have studied the Zeeman splitting in ballistic hole Quantum Wires formed in a (311)A Quantum well by surface gate confinement. Transport measurements clearly show lifting of the spin degeneracy and crossings of the subbands when an in-plane magnetic field B is applied parallel to the wire. When B is oriented perpendicular to the wire, no spin splitting is discernible up to B = 8.8 T. The observed large Zeeman splitting anisotropy in our hole Quantum Wires demonstrates the importance of Quantum confinement for spin splitting in nanostructures with strong spin-orbit coupling.
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Rashba spin splitting in Quantum Wires
Solid State Communications, 2004Co-Authors: Michele Governale, U ZulickeAbstract:Abstract This article presents an overview of results pertaining to electronic structure, transport properties, and interaction effects in ballistic Quantum Wires with Rashba spin splitting. Limits of weak and strong spin–orbit coupling are distinguished, and spin properties of the electronic states elucidated. The case of strong Rashba spin splitting where the spin-precession length is comparable to the wire width turns out to be particularly interesting. Hybridization of spin-split Quantum-wire subbands leads to an unusual spin structure where the direction of motion for electrons can fix their spin state. This peculiar property has important ramifications for linear transport in the Quantum wire, giving rise to spin accumulation without magnetic fields or ferromagnetic contacts. A description for interacting Rashba-split Quantum Wires is developed, which is based on a generalization of the Tomonaga–Luttinger model.
K A Matveev - One of the best experts on this subject based on the ideXlab platform.
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transport properties of partially equilibrated Quantum Wires
Physical Review B, 2010Co-Authors: Tobias Micklitz, Jerome Rech, K A MatveevAbstract:We study the effect of thermal equilibration on the transport properties of a weakly interacting one-dimensional electron system. Although equilibration is severely suppressed due to phase-space restrictions and conservation laws, it can lead to intriguing signatures in partially equilibrated Quantum Wires. We consider an ideal homogeneous Quantum wire. At finite temperature we find a correction to the quantized conductance, which for a short wire scales with its length, but saturates in the limit of an infinitely long wire. We also discuss thermoelectric properties of long Quantum Wires. We show that the uniform Quantum wire is a perfect thermoelectric refrigerator, approaching Carnot efficiency with increasing wire length.
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spontaneous spin polarization in Quantum Wires
EPL, 2006Co-Authors: A D Klironomos, Julia S Meyer, K A MatveevAbstract:A number of recent experiments report spin polarization in Quantum Wires in the absence of magnetic fields. These observations are in apparent contradiction with the Lieb-Mattis theorem, which forbids spontaneous spin polarization in one dimension. We show that sufficiently strong interactions between electrons induce deviations from the strictly one-dimensional geometry and indeed give rise to a ferromagnetic ground state in a certain range of electron densities.
A D Klironomos - One of the best experts on this subject based on the ideXlab platform.
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spontaneous spin polarization in Quantum Wires
EPL, 2006Co-Authors: A D Klironomos, Julia S Meyer, K A MatveevAbstract:A number of recent experiments report spin polarization in Quantum Wires in the absence of magnetic fields. These observations are in apparent contradiction with the Lieb-Mattis theorem, which forbids spontaneous spin polarization in one dimension. We show that sufficiently strong interactions between electrons induce deviations from the strictly one-dimensional geometry and indeed give rise to a ferromagnetic ground state in a certain range of electron densities.
Julia S Meyer - One of the best experts on this subject based on the ideXlab platform.
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spontaneous spin polarization in Quantum Wires
EPL, 2006Co-Authors: A D Klironomos, Julia S Meyer, K A MatveevAbstract:A number of recent experiments report spin polarization in Quantum Wires in the absence of magnetic fields. These observations are in apparent contradiction with the Lieb-Mattis theorem, which forbids spontaneous spin polarization in one dimension. We show that sufficiently strong interactions between electrons induce deviations from the strictly one-dimensional geometry and indeed give rise to a ferromagnetic ground state in a certain range of electron densities.
L.n. Pfeiffer - One of the best experts on this subject based on the ideXlab platform.
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Photoluminescence excitation spectra in T-shaped Quantum Wires
Postconference Digest Quantum Electronics and Laser Science 2003. QELS., 2003Co-Authors: H. Itoh, Y. Hayamizu, M. Yoshita, H. Akiyama, K.w. West, L.n. PfeifferAbstract:We measured polarization-dependent photoluminescence-excitation spectra, of high-quality T-shaped Quantum Wires at 5 K, and revealed absorption line shape of one-dimensional (1D) continuum and exciton states resulted from strong ID Coulomb interactions.
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nonuniversal conductance quantization in Quantum Wires
Physical Review Letters, 1996Co-Authors: Amir Yacoby, L.n. Pfeiffer, H L Stormer, Ned S Wingreen, K W Baldwin, K.w. WestAbstract:We have measured the transport properties of high-quality Quantum Wires fabricated in GaAs-AlGaAs by using cleaved edge overgrowth. The low temperature conductance is quantized as the electron density in the wire is varied. While the values of the conductance plateaus are reproducible, they deviate from multiples of the universal value of 2e2yh by as much as 25%. As the temperature or dc bias increases the conductance steps approach the universal value. Several aspects of the data can be explained qualitatively using Luttinger liquid theory although there remain major inconsistencies with such an interpretation. [S0031-9007(96)01675-4]
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lasing from excitons in Quantum Wires
Physical Review Letters, 1993Co-Authors: Werner Wegscheider, K.w. West, L.n. Pfeiffer, M M Dignam, A Pinczuk, S L Mccall, R HullAbstract:Stimulated optical emission from the lowest exciton state in atomically smooth semiconductor Quantum Wires is observed for the first time. The Wires are formed by the ssT intersection of two 7 nm GaAs Quantum wells. The optical emission wavelength is nearly independent of pump levels. This absence of band-gap renormalization in the laser emission indicates a marked increase in the stability of the exciton in one dimension.
