NONLINEAR CHARACTERISTIC OF TWO COUPLED QUANTUM-DOT CELLS

Abstract

The nonlinear behavior of two kinds of arrays of two coupled quantum-dot cells w as examined. Each square cell composed of four quantum dots in the corners conta ins two electrons and couples with the neighboring cell by Coulomb interaction. The electrons in one cell tend to occupy antipodal dots which results in a cell “polarization”. In steady-state regime, we have investigated the evolution of the polarization of one cell under the switch of the polarization of the other c ell. Our results demonstrated that the response of the polarization of one cell to that of the other cell exhibits a good nonlinear characteristics with suitabl e parameters.