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arXiv · 2005.00591

Spin-Lasers: Spintronics Beyond Magnetoresistance

Igor Žutić·Gaofeng Xu·Markus Lindemann·Paulo E. Faria Junior·Jeongsu Lee·Velimir Labinac·Kristian Stojšić·Guilherme M. Sipahi·Martin R. Hofmann·Nils C. Gerhardt
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Abstract

Introducing spin-polarized carriers in semiconductor lasers reveals an alternative path to realize room-temperature spintronic applications, beyond the usual magnetoresistive effects. Through carrier recombination, the angular momentum of the spin-polarized carriers is transferred to photons, thus leading to the circularly polarized emitted light. The intuition for the operation of such spin-lasers can be obtained from simple bucket and harmonic oscillator models, elucidating their steady-state and dynamic response, respectively. These lasers extend the functionalities of spintronic devices and exceed the performance of conventional (spin-unpolarized) lasers, including an order of magnitude faster modulation frequency. Surprisingly, this ultrafast operation relies on a short carrier spin relaxation time and a large anisotropy of the refractive index, both viewed as detrimental in spintronics and conventional lasers. Spin-lasers provide a platform to test novel concepts in spin devices and offer progress connected to the advances in more traditional areas of spintronics.

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Igor Žutić, Gaofeng Xu, Markus Lindemann, Paulo E. Faria Junior, Jeongsu Lee, Velimir Labinac, Kristian Stojšić, Guilherme M. Sipahi, Martin R. Hofmann, Nils C. Gerhardt. 2020-05-01. Spin-Lasers: Spintronics Beyond Magnetoresistance. https://doi.org/10.1016/j.ssc.2020.113949

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