Regensburg 2025 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 34: Focus Session: Quantum Emission from Chaotic Microcavities (joint session HL/DY)

HL 34.1: Hauptvortrag

Mittwoch, 19. März 2025, 09:30–10:00, H17

From complex internal dynamics to emission characteristics control in quantum billiards — •Martina Hentschel — 1 Institute of Physics, Technische Universität Chemnitz, D-09107 Chemnitz, Germany

The field of mesoscopic physics has given access to new classes of fascinating model systems ranging from ballistic quantum dots via microcavity lasers to graphene billiards over the past decades. Their rich internal dynamics, subject to quantum chaos and often successfully accessed employing wave-particle correspondence in real and phase space, is directly related to their emission properties. Here, we illustrate this close connection for various examples and system classes. For optical microcavities, we vary the internal dynamics by changing the geometric shape of the resonator and explain how the far-field emission characteristics is determined by the underlying steady probability distribution and a possibility to achieve directional emission required for microlasing devices with the Limaçon geometry. Placing sources into the cavity will affect the internal dynamics of the cavity by, taking the particle point-of-view, effectively changing the set of initial conditions, as observed for optical cavities as well as for graphene billiards in the form of Dirac fermion optics. A further way to change the dynamics of a system is the existence of anisotropies that can either be intrinsically present such as in bilayer graphene in the form of trigonal warping [1], or can be induced to a given system by, for example, applying a mechanical strain. [1] L. Seemann, A. Knothe, and M. Hentschel, New J. Phys. 26, 103045 (2024).

Keywords: chaotic microcavities; directional emission; anisotropy; ray-wave correspondence