Dynamical multistability in a quantum dot laser

Mantovani, Mattia; Armour, Andrew D; Belzig, Wolfgang; Rastelli, Gianluca

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 multi-peaked 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.

Citation

Mantovani, M., Armour, A. D., Belzig, W., & Rastelli, G. (2019). Dynamical multistability in a quantum dot laser. Physical Review B, 99(4), Article 045442. https://doi.org/10.1103/PhysRevB.99.045442

• Journal Article Type: Article
• Acceptance Date: Jan 16, 2019
• Online Publication Date: Jan 30, 2019
• Publication Date: Jan 30, 2019
• Deposit Date: Jan 31, 2019
• Publicly Available Date: Jan 31, 2019
• Journal: Physical Review B
• Print ISSN: 2469-9950
• Electronic ISSN: 2469-9969
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 99
• Issue: 4
• Article Number: 045442
• DOI: https://doi.org/10.1103/PhysRevB.99.045442
• Public URL: https://nottingham-repository.worktribe.com/output/1509659
• Publisher URL: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.99.045442
• Contract Date: Jan 31, 2019