Regensburg 2025 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 31: Focus Session: Young Semiconductor Forum Poster

HL 31.1: Poster

Wednesday, March 19, 2025, 12:15–13:00, H13

Exploring Auto-Oscillations in Semiconductor Electron-Nuclear Spin System — •Alex Greilich, Nataliia E. Kopteva, Vladimir L. Korenev, and Manfred Bayer — Experimentelle Physik 2a, TU Dortmund University, Dortmund, Germany

We demonstrate self-sustained auto-oscillations in a dissipative electron-nuclear spin system (ENSS) in semiconductors, where spontaneous breaking of translational symmetry in time produces robust limit-cycle dynamics across a broad range of parameters, including laser power, temperature, and magnetic field. These periodic oscillations exhibit coherence times extending to hours, reflecting ideal "time atom" ordering within the auto-oscillatory system.

Additionally, we uncover synchronization within excited subsystems without additional modulation, identifying its microscopic origins. Under periodic driving, modulation of parameters such as excitation power and pump polarization yields parametric resonances, signaling a transition to discrete auto-oscillatory behavior. Key phenomena include frequency entrainment, Arnold tongues, bifurcation jets, and a devil's staircase, showcasing the ENSS's versatility in exploring nonlinear dynamics, with broad implications for both fundamental physics and semiconductor applications.

Keywords: time crystal; auto-oscillations; non-linear system; synchronization; electron-nuclear spin sytem