Exchange-induced enhancement of spin-orbit coupling in two-dimensional electronic systems

Chen, Guang-Hong; Raǐkh, M. É.

doi:10.1103/physrevb.60.4826

Cited by 117 publications

(98 citation statements)

References 46 publications

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“…Therefore, there is no cancellation between the self-energy and vertex contributions, and the frequencies of the modes are renormalized by eei. If U x = const, one can show 29,30 that δΣ s does not contain the zeroth angular harmonic of the interaction (which is why δΣ s = 0 for U x = const), whereas the vertex contribution does. Thus, there is no cancellation between the two contributions in the general case as well.…”

Section: Fig 1: Leftmentioning

confidence: 99%

Intrinsic Damping of Collective Spin Modes in a Two-Dimensional Fermi Liquid with Spin-Orbit Coupling

Maiti

Maslov

2015

Phys. Rev. Lett.

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A Fermi liquid with spin-orbit coupling (SOC) is expected to support a new kind of collective modes: oscillations of magnetization in the absence of the magnetic field. We show that these modes are damped by the electron-electron interaction even in the limit of an infinitely long wavelength (q = 0). The linewidth of the collective mode is on the order of ∆2 /EF , where ∆ is a characteristic spin-orbit energy splitting and EF is the Fermi energy. Such damping is in a stark contrast to known damping mechanisms of both charge and spin collective modes in the absence of SOC, all of which disappear at q = 0, and arises because none of the components of total spin is conserved in the presence of SOC.

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Section: Fig 1: Leftmentioning

confidence: 99%

Intrinsic Damping of Collective Spin Modes in a Two-Dimensional Fermi Liquid with Spin-Orbit Coupling

Maiti

Maslov

2015

Phys. Rev. Lett.

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“…We expect our main result that interactions enhance Rashba precession to carry over to more channel situations. Indeed, a recent careful analysis within improved versions of the RPA approximation has revealed enhancement of the Rashba precession in the two dimensional electron system [18]. One might comprehend these findings as a consequence of 'repulsion' between the two spin split bands by the interaction.…”

mentioning

confidence: 99%

Rashba precession in quantum wires with interaction

Häusler

2001

Phys. Rev. B

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Rashba precession of spins moving along a one-dimensional quantum channel is calculated, accounting for Coulomb interactions. The Tomonaga-Luttinger model is formulated in the presence of spin-orbit scattering and solved by Bosonization. Increasing interaction strength at decreasing carrier density is found to enhance spin precession and the nominal Rashba parameter due to the decreasing spin velocity compared with the Fermi velocity. This result can elucidate the observed pronounced changes of the spin splitting on applied gate voltages which are estimated to influence the interface electric field in heterostructures only little. : 71.10.Pm, 71.70.Ej, 73.20.Dx According to recent speculations spin could replace the electric charge to carry information in future electronic devices [1]. The 'spin transistor' proposed by Datta and Das [2] might switch faster than traditional transistors since during operation it avoids redistributing charges. The idea is based on the Rashba effect [3] which causes spins to precess as they move along a heterostructure [4] so that the conductance depends on the final spin orientation relative to the magnetization of the ferromagnetic drain contact [5,6]. The strength of the Rashba effect is proportional to the electric field acting perpendicular to the electron plane which, when varied by a gate, changes the final spin orientation and thus the transport properties of the device. Advantage is taken of long spin coherence times and lengths [7], found in semiconductors. In the attempt of experimental realization considerable progress has been achieved meanwhile to inject finite spin densities [8]. Polarizations of 90% have been reported in GaAs [9]. PACSBeating patterns varying with gate voltages have indeed been observed in Shubnikov-de Haas (SdH) measurements [10][11][12]. Estimates show, however, that the the gate voltage adds an electric field contribution to a much stronger intrinsic field at the interface which does not suffice to explain the observed variations in spin splittings by a factor of two. One should notice that the gate voltage not only changes the strength of the electric field but at the same time it also alters the carrier density in the heterostructure as is directly monitored by the SdH oscillations. Without interactions this would not change the Rashba precession within the effective mass approximation [13] but, since particularly in semiconductors the strength of Coulomb interactions change with density through the r s -parameter, the question arises whether interactions influence the Rashba precession. This is demonstrated in the present Communications. In principle, the two effects of the gate, changing field strength and density, can be separated experimentally by varying the voltage at a front gate and a back gate independently [11].Usually, Rashba spin precession is described as a band structure effect, resulting from spin splitting [2,4], as calculated in the original work by Rashba [3] for the homogeneous two-dimensional case. Such a single particle a...

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“…The eigenvalues (25) are spin-independent and thus doubly degenerate. The corresponding eigenstates are denoted |nqaσ , where |n and |q are respectively plane waves in circumferential and longitudinal direction.…”

Section: Continuum Limitmentioning

confidence: 99%

“…Here we confine ourselves to the noninteracting problem in order to not overly complicate the analysis, but study the many-band case and details of the band structure. Interactions can be taken into account within the Luttinger liquid approach at a later stage, and may enhance the effect of SO couplings [22,25]. We shall also neglect disorder effects.…”

Section: Introductionmentioning

confidence: 99%

Rashba spin–orbit coupling and spin precession in carbon nanotubes

Martino

Egger²

2005

J. Phys.: Condens. Matter

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This is the unspecified version of the paper.This version of the publication may differ from the final published version. Abstract. The Rashba spin-orbit coupling in carbon nanotubes and its effect on spin-dependent transport properties are analyzed theoretically. We focus on clean non-interacting nanotubes with tunable number of subbands N . The peculiar band structure is shown to allow in principle for Datta-Das oscillatory behavior in the tunneling magnetoresistance as a function of gate voltage, despite the presence of multiple bands. We discuss the conditions for observing Datta-Das oscillations in carbon nanotubes. Permanent

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Exchange-induced enhancement of spin-orbit coupling in two-dimensional electronic systems

Cited by 117 publications

References 46 publications

Intrinsic Damping of Collective Spin Modes in a Two-Dimensional Fermi Liquid with Spin-Orbit Coupling

Intrinsic Damping of Collective Spin Modes in a Two-Dimensional Fermi Liquid with Spin-Orbit Coupling

Rashba precession in quantum wires with interaction

Rashba spin–orbit coupling and spin precession in carbon nanotubes

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