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Tunneling between 2D electron layers with correlated disorder: anomalous sensitivity to spin-orbit coupling

V. A. Zyuzin·E. G. Mishchenko·M. E. Raikh
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Abstract

Tunneling between two-dimensional electron layers with mutually correlated disorder potentials is studied theoretically. Due to this correlation, the diffusive eigenstates in different layers are almost orthogonal to each other. As a result, a peak in the tunnel I-V characteristics shifts towards small bias, V. This "protects" the peak against the interaction-induced smearing, since the relaxation rate near the Fermi level is low. If the correlation in disorder potentials is complete, the peak position and width are governed by the spin-orbit coupling in the layers; this coupling lifts the orthogonality of the eigenstates. Possibility to use inter-layer tunneling for experimental determination of weak intrinsic spin-orbit splitting of the Fermi surface is discussed.

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V. A. Zyuzin, E. G. Mishchenko, M. E. Raikh. 2006-11-17. Tunneling between 2D electron layers with correlated disorder: anomalous sensitivity to spin-orbit coupling. https://doi.org/10.1103/physrevb.74.205322

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