Phonon-Assisted Gain in a Semiconductor Double Quantum Dot Maser
Michael J. Gullans, Y.-Y. Liu, J. Stehlik, J. R. Petta, Jacob M. Taylor · Physical Review Letters · 2015
We develop a microscopic model for the recently demonstrated double-quantum-dot maser. In characterizing the gain of this device we find that, in addition to the direct stimulated emission of photons, there is a large contribution from the simultaneous emission of a photon and a phonon, i.e., the phonon sideband. We show that this phonon-assisted gain typically dominates the overall gain, which leads to masing. Recent experimental data are well fit with our model.