Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 9: Focus Session: Exceptional Points and Non-Hermitian Physics in Semiconductor Systems

HL 9.2: Hauptvortrag

Montag, 5. September 2022, 15:30–16:00, H33

Complex Skin Modes in Non-Hermitian Coupled Laser Arrays — •Mercedeh Khajavikhan and Yuzhou Liu — 1002 Childs Way, Los Angeles, CA 90089

In the realm of non-Hermitian physics, the possibility of complex and asymmetric exchange interactions between a network of oscillators has been theoretically shown to lead to novel behaviors like delocalization, skin effect, and bulk-boundary correspondence. While the ramifications of these theoretical works in optics have been recently pursued in synthetic dimensions, the Hatano-Nelson model has yet to be realized in real space. In this work, by using active optical oscillators featuring non-Hermiticity and nonlinearity, we introduce an anisotropic exchange between the resonant elements in a lattice, an aspect that enables us to observe the non-Hermitian skin effect, phase locking, and near-field beam steering in a Hatano-Nelson laser array. This work can open up new regimes of phase-locking in lasers while shedding light on the fundamental physics of non-Hermitian systems.