Polariton Spin Whirls
Pasquale Cilibrizzi, Helgi Sigurdsson, Tim C.H. Liew, Hamid Ohadi,, Simon Wilkinson, Alexis Askitopoulos, Ivan A. Shelykh, and Pavlos Lagoudakis
TL;DR
This paper reports the observation of spin whirls in a polariton condensate, demonstrating complex polarization patterns and the role of spin interactions, with implications for controlling spin currents in solid state systems.
Contribution
It provides the first experimental observation of spin whirls in polariton condensates and highlights the importance of spinor interactions with an exciton reservoir for manipulating spin dynamics.
Findings
Observation of spiraling polarization patterns in real space
Simulation results showing the role of spinor exciton reservoir interactions
Potential for controlling spin currents via spin-dependent interactions
Abstract
We report on the observation of spin whirls in a radially expanding polariton condensate formed under non-resonant optical excitation. Real space imaging of polarization- and time-resolved photoluminescence reveal a spiralling polarization pattern in the plane of the microcavity. Simulations of the spatiotemporal dynamics of a spinor condensate reveal the crucial role of polariton interactions with a spinor exciton reservoir. Harnessing spin dependent interactions between the exciton reservoir and polariton condensates allows for the manipulation of spin currents and the realization of dynamic collective spin effects in solid state systems.
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