Singlet-Triplet Switching Induced by Electric Field in Triple Quantum Dots

Abstract

We analyze inuence of an external electric eld on magnetic properties of a triple quantum dot system in a triangular and linear geometry.The system contains four electrons and is described by an extended Hubbard model which includes electron correlations and exchange processes.The electric eld leads to splitting of energy levels (the Stark eect) and to transition between the singlet and triplet states.