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Light Amplification without Inversion from Hybrid Quantum Dot–Resonator Circuit: Floquet Nonequilibrium Green's Function Approach
Author(s) -
Jahangiri Neda
Publication year - 2021
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.202000312
Subject(s) - floquet theory , andreev reflection , physics , quantum dot , condensed matter physics , biasing , non equilibrium thermodynamics , superconductivity , inversion (geology) , quantum mechanics , voltage , nonlinear system , paleontology , structural basin , biology
Herein, a new mechanism of steady‐state light amplification without inversion from a hybrid quantum dot circuit coupled to a single mode of electromagnetic resonator is theoretically investigated. Hybrid quantum dot circuit consists of a single‐level quantum dot which is connected weakly to one normal metal electrode and strongly to one superconducting electrode. Using the Floquet nonequilibrium Green's function technique, it is shown that the gain originates from the Andreev reflection processes at proper gate voltages when the bias voltage exceeds a certain threshold. Also, it is found that the inversionless light amplification is mediated by spin transitions between Andreev and Floquet–Andreev bound states in the superconducting energy gap.