Phonon-assisted damping of Rabi oscillations in semiconductor quantum dots

Phys Rev Lett. 2003 Sep 19;91(12):127401. doi: 10.1103/PhysRevLett.91.127401. Epub 2003 Sep 16.

Abstract

Electron-phonon interaction is a major source of optical dephasing in semiconductor quantum dots. Within a density matrix theory the electron-phonon interaction is considered up to the second order of a correlation expansion, allowing the calculation of the quantum kinetic dephasing dynamics of optically induced nonlinearities in GaAs quantum dots for arbitrary pulse strengths and shapes. We find Rabi oscillations renormalized and a damping that depends on the input pulse strength, a behavior not known from exponential dephasing mechanisms.