Issue
EPL
Volume 82, Number 6, June 2008
Article Number 60006
Number of page(s) 5
Section General
DOI http://dx.doi.org/10.1209/0295-5075/82/60006
Published online 10 June 2008
EPL, 82 (2008) 60006
DOI: 10.1209/0295-5075/82/60006

Voltage-controlled Berry phases in two vertically coupled InGaAs/GaAs quantum dots

Huan Wang and Ka-Di Zhu

Department of Physics, Shanghai Jiao Tong University - Shanghai 200240, PRC

wanghuan2626@sjtu.edu.cn

received 21 January 2008; accepted in final form 30 April 2008; published June 2008
published online 10 June 2008

Abstract
The voltage-controlled Berry phases in two vertically coupled InGaAs/GaAs quantum dots are investigated theoretically. It is found that Berry phases can be changed dramatically from 0 to 2$\pi $ (or 2$\pi $ to 0) only by simply applying an external voltage. Under realistic conditions, as the tunneling is varied from 0.8 eV to 0.9 eV via a bias voltage, the Berry phases are altered obviously, and this can be detected in an interference experiment. The scheme is expected to be useful in constructing quantum computation based on geometric phases in an asymmetrical double quantum dot controlled by voltage.

PACS
03.65.Vf - Phases: geometric; dynamic or topological.
81.07.Ta - Quantum dots.

© EPLA 2008