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arXiv · 1410.3262

Spin-polarized dynamic transport in tubular two-dimensional electron gases

E. A. Rothstein·B. Horovitz·O. Entin-Wohlman·A. Aharony
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Abstract

The ac conductance of a finite tubular two-dimensional electron gas is studied in the presence of the Rashba spin-orbit interaction. When the tube is coupled to two reservoirs, that interaction splits the steps in the dc current, introducing energy ranges with spin-polarized currents. For this setup, we calculate the current-current correlations (the noise spectrum) and show that the existence of these dc spin-polarized currents can be deduced from the shot noise. We also find that the Wigner-Smith time delay is almost unaffected by the spin-orbit interaction. When the tube is coupled to a single reservoir, we calculate the quantum capacitance and the charge-relaxation resistance, and find that they exhibit singularities near the openings of new channels.

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E. A. Rothstein, B. Horovitz, O. Entin-Wohlman, A. Aharony. 2014-10-13. Spin-polarized dynamic transport in tubular two-dimensional electron gases. https://doi.org/10.1103/physrevb.90.245425

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