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Title: Rashba torque beyond the Boltzmann regime

Journal Article · · Physical Review B
 [1];  [2]
  1. Univ. of Texas, Austin, TX (United States). Dept. of Physics
  2. Univ. of Texas, Austin, TX (United States). Dept. of Physics; Peking Univ., Beijing (China). School of Physics
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We study spin torques induced by Rashba spin-orbit coupling in two-dimensional ferromagnets under the good-metal condition ε F τ / ℏ >> 1 ( ε F the Fermi energy, τ the electron lifetime) by employing the Kubo formula. We find that in the presence of spin-dependent disorder the Rashba torque changes greatly as the system evolves out of the weak-disorder limit where ℏ / τ is much smaller than any intrinsic energy scale characterizing the multiband structure. The antidamping-like component of Rashba torque can be comparable to and larger than the field-like one out of the weak-disorder limit. The semiclassical Boltzmann theory produces the same results as microscopic linear response calculations only in the weak-disorder limit. Our analysis indicates that rich behaviors of various nonequilibrium phenomena beyond the Boltzmann theory may also be present even when ε F τ / ℏ >> 1 in multiband systems where ε F is not the unique intrinsic energy scale.

Research Organization:
Univ. of Texas, Austin, TX (United States)
Sponsoring Organization:
National Science Foundation (NSF); Welch Foundation; USDOE; National Basic Research Program of China
Grant/Contract Number:
FG03-02ER45958; 2013CB921900
OSTI ID:
1418616
Alternate ID(s):
OSTI ID: 1371954
Journal Information:
Physical Review B, Vol. 96, Issue 3; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 7 works
Citation information provided by
Web of Science

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Cited By (4)

Tuning of current-induced effective magnetic field through Rashba effect engineering in hybrid multiferroic structures journal August 2018
Boltzmann approach to spin–orbit-induced transport in effective quantum theories journal September 2018
Spin-orbit related power-law dependence of the diffusive conductivity on the carrier density in disordered Rashba two-dimensional electron systems journal January 2020
Spin-orbit related power-law dependence of the diffusive conductivity on the carrier density in disordered Rashba two-dimensional electron systems text January 2019

Figures / Tables (2)

FIG. 1(p. 4)figure FIG. 1
FIG. 2(p. 4)figure FIG. 2

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