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Aharonov-Bohm conductance of a disordered single-channel quantum ring | | P.M. Shmakov
; A.P. Dmitriev
; V.Yu.Kachorovskii
; | | Date: |
14 Mar 2013 | | 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. | | Source: | arXiv, 1303.3486 | | Services: | Forum | Review | PDF | Favorites | |
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