Geometric Phase in a Tunneling-Coupled Quantum Dot Molecule

Abstract

If a quantum system evolves periodically, the Pancharatnam geometric phase generated in one period becomes the famous Berry phase. We calculated the Berry phase of a tunneling-coupled double quantum dot driven by an external laser field, in the stationary state, by using the general theory for an open three-level quantum system. The effects of tunneling strength, intensity of the laser field, frequency difference of the tunneling levels and detuning of the laser are investigated.