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Title: An Exact SU(2) Symmetry and Persistent Spin Helix ina Spin-orbit Coupled System

Abstract

Spin-orbit coupled systems generally break the spin rotation symmetry. However, for a model with equal Rashba and Dresselhauss coupling constant (the ReD model), and for the [110] Dresselhauss model, a new type of SU(2) spin rotation symmetry is discovered. This symmetry is robust against spin-independent disorder and interactions, and is generated by operators whose wavevector depends on the coupling strength. It renders the spin lifetime infinite at this wavevector, giving rise to a Persistent Spin Helix (PSH). We obtain the spin fluctuation dynamics at, and away, from the symmetry point, and suggest experiments to observe the PSH.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
898147
Report Number(s):
SLAC-PUB-12313
TRN: US0700572
DOE Contract Number:
AC02-76SF00515
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Lettters
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; SU-2 GROUPS; COUPLING CONSTANTS; FLUCTUATIONS; LIFETIME; ROTATION; SPIN; SYMMETRY; Accelerators,ACCSYS

Citation Formats

Bernevig, B.A., /Stanford U., Phys. Dept. /Santa Barbara, KITP, Orenstein, J., /LBL, Berkeley /UC, Berkeley, Zhang, Shou-Cheng, and /Stanford U., Phys. Dept. An Exact SU(2) Symmetry and Persistent Spin Helix ina Spin-orbit Coupled System. United States: N. p., 2007. Web.
Bernevig, B.A., /Stanford U., Phys. Dept. /Santa Barbara, KITP, Orenstein, J., /LBL, Berkeley /UC, Berkeley, Zhang, Shou-Cheng, & /Stanford U., Phys. Dept. An Exact SU(2) Symmetry and Persistent Spin Helix ina Spin-orbit Coupled System. United States.
Bernevig, B.A., /Stanford U., Phys. Dept. /Santa Barbara, KITP, Orenstein, J., /LBL, Berkeley /UC, Berkeley, Zhang, Shou-Cheng, and /Stanford U., Phys. Dept. Mon . "An Exact SU(2) Symmetry and Persistent Spin Helix ina Spin-orbit Coupled System". United States. doi:. https://www.osti.gov/servlets/purl/898147.
@article{osti_898147,
title = {An Exact SU(2) Symmetry and Persistent Spin Helix ina Spin-orbit Coupled System},
author = {Bernevig, B.A. and /Stanford U., Phys. Dept. /Santa Barbara, KITP and Orenstein, J. and /LBL, Berkeley /UC, Berkeley and Zhang, Shou-Cheng and /Stanford U., Phys. Dept.},
abstractNote = {Spin-orbit coupled systems generally break the spin rotation symmetry. However, for a model with equal Rashba and Dresselhauss coupling constant (the ReD model), and for the [110] Dresselhauss model, a new type of SU(2) spin rotation symmetry is discovered. This symmetry is robust against spin-independent disorder and interactions, and is generated by operators whose wavevector depends on the coupling strength. It renders the spin lifetime infinite at this wavevector, giving rise to a Persistent Spin Helix (PSH). We obtain the spin fluctuation dynamics at, and away, from the symmetry point, and suggest experiments to observe the PSH.},
doi = {},
journal = {Physical Review Lettters},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 22 00:00:00 EST 2007},
month = {Mon Jan 22 00:00:00 EST 2007}
}