Bosonic Cascade Laser

TL;DR

This paper proposes a novel bosonic cascade laser using excitons and exciton-polaritons in semiconductor microcavities, which emits terahertz radiation through bosonic stimulation, differing fundamentally from traditional fermionic cascade lasers.

Contribution

It introduces a new concept of a bosonic cascade laser based on excitonic transitions, highlighting unique population dynamics and the potential for terahertz emission without an external cavity.

Findings

Populations of excitonic ladders are parity-dependent.

Excitonic populations are quantized in the absence of an external terahertz cavity.

The dynamics differ significantly from conventional fermionic cascade lasers.

Abstract

We propose a concept of a quantum cascade laser based on transitions of bosonic quasiparticles (excitons and exciton-polaritons) in a parabolic potential trap in a semiconductor microcavity. This laser would emit terahertz radiation due to bosonic stimulation of excitonic transitions. Dynamics of a bosonic cascade is strongly different from the dynamics of a conventional fermionic cascade laser. We show that populations of excitonic ladders are parity-dependent and quantized if the laser operates without an external terahertz cavity.