Transient electric current through an Aharonov-Bohm ring after switching of a two-level system

Article

关键词: QUANTUM-DOT;    DISORDERED CONDUCTORS;    TIME;    NANOCONTACTS;    MAGNETORESISTANCE;    LOCALIZATION;    SPECTROSCOPY;    INTERFERENCE;    TEMPERATURE;    TRANSPORT;   

DOI  :  10.1103/PhysRevB.65.205318

来源: SCIE

【 摘 要 】

The response of the electronic current through an Aharonov-Bohm ring after a two-level-system is switched on is calculated perturbatively by use of a nonequilibrium Green function. In the ballistic case the amplitude of the Aharonov-Bohm oscillation is shown to decay to a new equilibrium value due to scattering into other electronic states. The relaxation of the Altshuler-Aronov-Spivak oscillation in the diffusive case, due to the dephasing effect, is also calculated. The time scale of the relaxation is determined by characteristic relaxation times of the system and the splitting of a two-level-system. The oscillation phase is not affected. Experimental studies of current response would give us direct information about characteristic times of mesoscopic systems.

【 授权许可】

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