Aharonov-Bohm conductance of a disordered single-channel quantum ring

Abstract

We study the effect of weak disorder on tunneling conductance of a single-channel quantum ring threaded by magnetic flux. We assume that temperature is higher than the level spacing in the ring and smaller than the Fermi energy. In the absence of disorder, the conductance shows sharp dips (antiresonances) as a function of magnetic flux. We discuss different types of disorder and find that the short-range disorder broadens antiresonances, while the long-range one leads to arising of additional resonant dips. We demonstrate that the resonant dips have essentially non-Lorentzian shape. The results are generalized to account for the spin-orbit interaction which leads to splitting of the disorder-broadened resonant dips, and consequently to coexisting of two types of oscillations (both having the form of sharp dips): Aharonov-Bohm oscillations with magnetic flux and Aharonov-Casher oscillations with the strength of the spin-orbit coupling. We also discuss the effect of the Zeeman coupling.

12 pages, 7 figures

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• Coherent spin transport through helical edge states of topological insulator
• DC spin generation by junctions with AC driven spin-orbit interaction
• Tunneling Aharonov-Bohm interferometer on helical edge states
• Spin and charge transport through helical Aharonov-Bohm interferometer with strong magnetic impurity
• Photovoltaic effect generated by spin-orbit interactions
• Spin-charge separation in an Aharonov-Bohm interferometer