Voltage-controlled Berry phases in two vertically coupled InGaAs/GaAs quantum dotsHuan Wang and Ka-Di Zhu
Department of Physics, Shanghai Jiao Tong University - Shanghai 200240, PRC
received 21 January 2008; accepted in final form 30 April 2008; published June 2008
published online 10 June 2008
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 (or 2 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.
03.65.Vf - Phases: geometric; dynamic or topological.
81.07.Ta - Quantum dots.
© EPLA 2008