Exciton-polariton Josephson interferometer in a semiconductor microcavity

Key Laboratory of Photovoltaic Materials of Henan Province, School of Physics and Electronics, Henan University Kaifeng, Henan 475004, China

^(a) zcy200883@163.com

Received: 11 August 2014
Accepted: 23 September 2014

Abstract

We propose to construct an exciton-polariton Josephson interferometer in a planar semiconductor microcavity. For a single excitation laser, the time-independent Josephson currents appear, regardless of the excitation laser, energy differences, and interactions. Exciton polaritons can exist in the trap far away from the excitation area (several micrometres), although their lifetime is very short (several picoseconds). If there are two excitation sources, the constructive and destructive interferences can be modulated, and they are related to the condensate energies, densities, interactions, and hopping energy in the dc Josephson effect. The transition is obtained by altering the condensate energies. A synchronized phase exists in the ac Josephson effect and keeps the system oscillating in the steady state. These results are useful to interpret the coherence in the driven-dissipative Josephson interferometer.