Dark-exciton giant Rabi oscillations with no external magnetic field

Multiphonon physics is an emerging field that serves as a test bed for fundamental quantum physics and several applications in metrology and on-chip communication, among others. Quantum acoustic cavities or resonators are devices that are being used to study multiphonon phenomena both theoretically and experimentally. In particular, we study a system consisting of a semiconductor quantum dot pumped by a driving laser and coupled to an acoustic cavity. This kind of system has proven to yield interesting multiphonon phenomena, but the description of the quantum dot has been limited to a two-level system. This limitation restrains the complexity that a true semiconductor quantum dot can offer. Instead, in this work we consider a model where the quantum dot can have both bright and dark excitons, the latter being particularly useful due to their lower decoherence rates, because they do not present spontaneous photon emission. In this setup, we demonstrate that by fine-tuning the driving laser frequency, one is able to realize giant Rabi oscillations between the vacuum state and a dark-exciton state with N-phonon bundles. From this, we highlight two outstanding features: first, we are able to create dark-state excitations in the quantum dot without the usual external magnetic field needed to do so; and second, in a dissipative scenario where the acoustic cavity and the quantum dot suffer from losses, the system acts as a phonon gun able to emit N-phonon bundles.