Nonequilibrium Phase Transitions in a Two-dimensional System of Exciton-polaritons in a Strong Electromagnetic Field

Student: Ipatov Nikolay

Supervisor: Sergei Gavrilov

Educational Programme: Physics (Master)

Final Grade: 8

Year of Graduation: 2024

A quasi-two-dimensional system of exciton polaritons in a semiconductor microcavity excited by a resonant light wave is considered. The properties of the polariton system localized in a circular resonator mesa are theoretically investigated. It is predicted that in a system with a discrete energy spectrum, when several sublevels of size quantization are excited, a series of transitions from stationary to self-oscillatory and subsequently chaotic states occurs. The transition from stationary states to oscillations is accompanied by a reduction in rotational symmetry: from full SO(2) to discrete C_2. In the chaotic region symmetry disappears completely. The cause of these transitions is the instability of the stationary state with respect to parametric scattering into new low-symmetry spatial modes.

Full text (added June 5, 2024)

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