Measurement Induced Dephasing and Suppression of Persistent Current in a Lattice Ring
Mesoscale and Nanoscale Physics
2009-11-11 v1
Abstract
We investigate the effect of measurement on the persistent current density in a lattice ring penetrated by an Aharonov-Bohm flux and coupled to a quantum dot which is continuously monitored by a point contact detector. It is demonstrated by explicit analysis of the time-evolution of current density that the persistent current in the lattice ring is suppressed completely due to dephasing of quantum states induced by an analogous which-way-measurment that whether or not the electron is localized on the quantum dot. Practical experiments to observe the measurment induced dephasing is proposed.
Keywords
Cite
@article{arxiv.cond-mat/0511191,
title = {Measurement Induced Dephasing and Suppression of Persistent Current in a Lattice Ring},
author = {Yong-Ping Zhang and Ying-Fang Gao and J. -Q. Liang},
journal= {arXiv preprint arXiv:cond-mat/0511191},
year = {2009}
}
Comments
4 pages, 5 figures