Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-08-31
Phys. Rev. B 75, 045333 (2007)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
8 pages, 2 figures
Scientific paper
10.1103/PhysRevB.75.045333
Employing diagrammatic perturbation theory, we calculate the (charge) Coulomb drag resistivity $\rho_D$ and spin Coulomb drag resistivity $\rho_{\uparrow\downarrow}$ in the presence of Rashba spin-orbit coupling. Analytical expressions for $\rho_D$ and $\rho_{\uparrow\downarrow}$ are derived, and it is found that spin-orbit interaction produces a small enhancement to $\rho_D$ and $\rho_{\uparrow\downarrow}$ in the ballistic regime while $\rho_D$ is unchanged in the diffusive regime. This enhancement in the ballistic regime is attributed to the enhancement of the nonlinear susceptibility (i.e. current produced through the rectification of the thermal electric potential fluctuations in the passive layer) while the lack of enhancement in the diffusive regime is due to the suppression by disorder.
Sarma Sankar Das
Tse Wang-Kong
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