Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 26: Quantum Dots and Wires 5: Optics 2

HL 26.5: Vortrag

Donnerstag, 8. September 2022, 10:30–10:45, H32

Sub- and Superradiant Effects in Bimodal Quantum-Dot Microcavity Lasers — •Isa Hedda Grothe and Jan Wiersig — Institut für Physik, Otto-von-Guericke-Universität Magdeburg, Germany

In standard nanolasers with a single cavity mode a strong influence of inter-emitter correlations on the input-output dynamics as well as the statistical properties of the emitted light has been described [1]. Below threshold subradiant emission emerges with superthermal values of the autocorrelation function g(2)(0), which is associated with strong bunching of the emitted photons. Similarly high values of g(2)(0) have also been found for the weak mode in micropillar lasers with two orthogonally polarized modes [2,3]. Here, however, this phenomenon is rooted in the interaction of both modes with a common gain medium which leads to gain competition between the two modes.

Making use of a theoretical semiconductor laser model based on the cluster-expansion method, we include correlations between the emitters in the description of bimodal microcavity lasers. This enables us to compare the influence of sub- and superradiant effects on the emission of bimodal lasers to that on lasers with a single mode. Additionally, we are able to distinguish features of the statistical properties of the emitted light that characterize either subradiance or gain competition as the source of superthermal photon bunching in bimodal lasers.

[1] H. A. M. Leymann et al., Phys. Rev. Applied 4, 044018 (2015).

[2] H. A. M. Leymann et al., Phys. Rev. A 87, 053819 (2013).

[3] M. Schmidt et al., Phys. Rev. Research 3, 013263 (2021).

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