Dresden 2026 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 39: 2D semiconductors VII – CrSBr and related heterostructures
HL 39.8: Vortrag
Donnerstag, 12. März 2026, 11:30–11:45, POT/0081
Magnetically controllable exciton-polariton condensation in CrSBr microwires — •Christian Weidgans1, Heng Zhang1, Niloufar Nilforoushan1,4, Julian Hirschmann2, Marlene Liebich1, Tobias Inzenhofer1, Imke Gronwald1, Josef Riepl1, Kseniia Mosina3, Zdeněk Sofer3, Fabian Mooshammer1, Florian Dirnberger2, and Rupert Huber1 — 1University of Regensburg, Germany — 2Technical University of Munich, Germany — 3University of Chemistry and Technology Prague, Czech Republic — 4Université Paris Cité, France
Coupling the macroscopic wave functions of quasiparticle condensates to other degrees of freedom, such as the electron spin, could offer valuable control knobs for future quantum applications. In particular, man-made condensates of light-matter hybrids known as exciton-polaritons have lacked a direct spin-related control mechanism. Here we demonstrate magnetically tunable exciton-polariton condensation in the antiferromagnetic semiconductor CrSBr, a van der Waals material with strongly linked optical and magnetic properties. Under photoexcitation, CrSBr microwires embedded in an optical cavity show the hallmarks of polariton condensation. The conditions for efficient optical pumping suggest a crucial role of recently discovered surface excitons. Applying an external magnetic field energetically shifts the photoemitting polariton states, enabling direct spin-based control. Our results highlight CrSBr microwires as a powerful platform for exploring magnetically tunable polariton condensates, their directional propagation and their potential for spin-based quantum devices.
Keywords: exciton-polariton condensation; CrSBr; magnetic control; van der Waals magnet; microwires