3 research outputs found
Nonlinear Inverse Spin Galvanic Effect in Anisotropic Disorder-free Systems
Spin transport phenomena in solid materials suffer limitations from spin
relaxation associated to disorder or lack of translational invariance.
Ultracold atoms, free of that disorder, can provide a platform to observe
phenomena beyond the usual two-dimensional electron gas. By generalizing the
approach used for isotropic two-dimensional electron gases, we theoretically
investigate the inverse spin galvanic effect in the two-level atomic system in
the presence of anisotropic Rashba-Dresselhaus spin-orbit couplings (SOC) and
external magnetic field. We show that the combination of the SOC results in an
asymmetric case: the total spin polarization considered for a small momentum
has a longer spin state than in a two-dimensional electron gas when the SOC
field prevails over the external electric field. Our results can be relevant
for advancing experimental and theoretical investigations in spin dynamics as a
basic approach for studying spin state control
Theory of the inverse spin galvanic effect in quantum wells
The understanding of the fundamentals of spin and charge densities and
currents interconversion by spin-orbit coupling can enable efficient
applications beyond the possibilities offered by conventional electronics. For
this purpose we consider various forms of the frequency-dependent inverse spin
galvanic effect (ISGE) in semiconductor quantum wells and epilayers taking into
account the cubic in the electron momentum spin-orbit coupling in the Rashba
and Dresselhaus forms, concentrating on the current-induced spin polarization
(CISP). We find that including the cubic terms qualitatively explains recent
findings of the CISP in InGaAs epilayers being the strongest if the internal
spin-orbit coupling field is the smallest and vice versa (Norman et . 2014,
Luengo et al. 2017), in contrast to the common understanding. Our results
provide a promising framework for the control of spin transport in future
spintronics devices.Comment: 13 pages, 12 figure
Theory of the inverse spin galvanic effect in quantum wells
The understanding of the fundamentals of spin and charge densities and currents interconversion by spin-orbit coupling can enable efficient applications beyond the possibilities offered by conventional electronics. For this purpose we consider various forms of the frequency-dependent inverse spin galvanic effect in semiconductor quantum wells and epilayers taking into account the cubic in the electron momentum spin-orbit coupling in the Rashba and Dresselhaus forms, concentrating on the current-induced spin polarization (CISP). We find that including the cubic terms qualitatively explains recent findings of the CISP in InGaAs epilayers being the strongest if the internal spin-orbit coupling field is the smallest and vice versa [Norman, Phys. Rev. Lett. 112, 056601 (2014)PRLTAO0031-900710.1103/PhysRevLett.112.056601; Luengo-Kovac, Phys. Rev. B 96, 195206 (2017)2469-995010.1103/PhysRevB.96.195206], in contrast to the common understanding. Our results provide a promising framework for the control of spin transport in future spintronics devices