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

Article

关键词: SPIN-ORBIT INTERACTION;    NORMAL-METAL RINGS;    MESOSCOPIC RINGS;    OSCILLATIONS;    INTERFEROMETER;    PHASE;    INTERFERENCE;    TRANSPORT;    REGIME;   

DOI  :  10.1103/PhysRevB.87.235417

来源: SCIE

【 摘 要 】

We study the effect of weak disorder on tunneling conductance of a single-channel quantum ring threaded by magnetic flux. We assume that the 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 the appearance 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.

【 授权许可】

Free