Triangular bound potential quantum dot qubit

摘要

We study the eigenenergies and the eigenfunctions of the ground and the first excited states of an electron, which is strongly coupled to the LO-phonon in a quantum dot with triangular bound potential by using the Pekar variational method. This system may be used as a two-level qubit. Our numerical results indicate that the oscillation period of the qubit is an increasing function of the confinement length, whereas it is a decreasing one of the electron-LO-phonon coupling constant. The influence of the confinement length on the oscillation period is dominant when the electron-LO-phonon coupling constant decreases, while the effect of the coupling constant on that is strong when the confinement length increases. Meanwhile, the oscillating period of the qubit and the electron probability density vary periodically with respect to the polar angle.