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Dynamical multistability in a quantum dot laser

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


Mattia Mantovani

Wolfgang Belzig

Gianluca Rastelli


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.

Journal Article Type Article
Publication Date Jan 30, 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
APA6 Citation Mantovani, M., Armour, A. D., Belzig, W., & Rastelli, G. (2019). Dynamical multistability in a quantum dot laser. Physical Review B, 99(4),
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