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arXiv · 1310.0882

A Room-temperature Spin-polarized Polariton Laser

Feng-kuo Hsu·Yi-Shan Lee·Sheng-Di Lin·Chih-Wei Lai
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Abstract

In the field of spin-controlled semiconductor lasers, massive effort has been focused upon materials with long spin relaxation times (~ns). In contrast, we demonstrate room-temperature spin-polarized ultrafast pulsed lasing in InGaAs quantum wells (~10 ps) embedded within a GaAs microcavity. The microcavity studied here is similar to vertical-cavity surface-emitting lasers (VCSEL) used in optical communication. Unlike a VCSEL, the present polariton laser has nonlinear output and energy shifts owing to the mixing of the free-carrier polarization and cavity light field. At room temperature, we observe features resembling those in exciton-polariton condensates at cryogenic temperatures, including the spontaneous build-up of spatial coherence, macroscopic occupation, and spin polarization. Our results should stimulate activities to exploit spin-orbit interaction and many-body effects for fundamental studies of quantum light-matter fluids and developments of spin-dependent optoelectronic devices.

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Feng-kuo Hsu, Yi-Shan Lee, Sheng-Di Lin, Chih-Wei Lai. 2013-10-04. A Room-temperature Spin-polarized Polariton Laser. https://doi.org/10.1103/physrevb.91.195312

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