Nonexistence of intrinsic spin currents

Physical Review Letters

Volumn 96, Issue 5, 2006, Pages

  Khaetskii, Alexander ^a  

^a UNIVERSITY OF MUNICH   (Germany)

Author keywords

[No Author keywords available]

Indexed keywords

APPROXIMATION THEORY; ELECTRONS; SCATTERING;

DISORDER POTENTIAL; SPIN CURRENTS; SPIN-DENSITY MATRIX METHOD;

QUANTUM THEORY;

EID: 33144481534     PISSN: 00319007     EISSN: 10797114     Source Type: Journal    
DOI: 10.1103/PhysRevLett.96.056602     Document Type: Article

References (22)

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12. We have investigated an intrinsic spin current (i.e., its value in the ballistic limit, when a spin-orbit splitting is much larger than the disorder induced broadening) in the generalized 2D Rashba model when the spin-orbit term contains an arbitrary dependence on the electron momentum (A. Khaetskii, cond-mat/0510815).
13. In contrast to the case of a linear in momentum Hamiltonian, the intrinsic current does not necessarily vanish. However, even in the ballistic limit indicated above, its value depends explicitly on the disorder properties, namely, on the correlation radius of the disorder potential. The situation is similar for the other Hamiltonians. For example, we have also studied this problem for the Hamiltonian of 3D holes, A. Khaetskii (unpublished).
14. These calculations show that the conclusion of the paper by S. Murakami, Phys. Rev. B PRBMDO 0163-1829 69, 241202(R) (2004), about the complete absence of the corrections to the intrinsic value of the spin current due to scattering, is correct only for the δ-correlated potential. 10.1103/PhysRevB.69. 241202
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20. This is equivalent to calculating qyz through the following formula qyz/px)Sy(0)(p), where Sy(0)(p)=[Ωy(p)/2Ω][f+(0)(p)-f-(0)(p)] is the equilibrium value of the Sy spin component. This integral is zero. [M.I. D'yakonov (private communication)].
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