Dynamical multistability in a quantum-dot laser

Year: 2019

Authors: Mantovani M., Armour A.D., Belzig W., Rastelli G.

Autors Affiliation: Univ Konstanz, Fachbereich Phys, D-78457 Constance, Germany. Univ Nottingham, Ctr Math & Theoret Phys Quantum Nonequilibrium Sy, Nottingham NG7 2RD, England. Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England. Univ Konstanz, Zukunftskolleg, D-78457 Constance, Germany.

Abstract: We study the dynamical multistability of a solid-state single-atom laser implemented in a quantum-dot spin valve. The system is formed by a resonator that interacts with a two-level system in a dot in contact with two ferromagnetic leads of antiparallel polarization. We show that a spin-polarized current provides high-efficiency pumping leading to regimes of multistable lasing, in which the Fock distribution of the oscillator displays a multipeaked distribution. The emergence of multistable lasing follows from the breakdown of the usual rotating-wave approximation for the coherent spin-resonator interaction which occurs at relatively weak couplings. The multistability manifests itself directly in the charge current flowing through the dot, switching between distinct current levels corresponding to the different states of oscillation.


Volume: 99 (4)      Pages from: 045442  to: 045442

More Information: We thank Mark Dykman, Christian Flindt, and Fabio Pistolesi for useful discussions. This research was supported by the German Excellence Initiative through the Zukunftskolleg and the Deutsche Forschungsgemeinschaft (SFB767).
KeyWords: single-atom lasing, quantum dots, quantum microwave circuits
DOI: 10.1103/PhysRevB.99.045442