Theoretical study of nonlinear optical rectification of a cylindrical quantum dot molecule in the Born–Markov regime

Abstract

The nonlinear optical rectification of a quantum dot molecule immersed in a uniform magnetic field was investigated using the Born–Markov master equation in the Lindblad form. The study system consisted of a molecule of two identical cylindrical quantum dots. The dressed states and the two-level quantum system approximation were used to construct the wave functions. Nonlinear optical rectification was obtained for different values of the tunneling rate and magnetic field. It was observed that the tunneling rate is related to the interaction strength between the two quantum dots. That is, as this interaction strength increases, the electron tends to be more confined between the energy levels. In addition, atypical behavior was observed in the rectification peaks, which do not always increase, but oscillate. This oscillating behavior can be attributed to magnetic fields inducing confinement in the charges.