Room-temperature polarized spin-photon interface based on a semiconductor nanodisk-in-nanopillar structure driven by few defects

Shula Chen (), Yuqing Huang, Dennis Visser, Srinivasan Anand, Irina A. Buyanova and Weimin M. Chen ()
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Shula Chen: Linköping University
Yuqing Huang: Linköping University
Dennis Visser: KTH Royal Institute of Technology
Srinivasan Anand: KTH Royal Institute of Technology
Irina A. Buyanova: Linköping University
Weimin M. Chen: Linköping University

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract Owing to their superior optical properties, semiconductor nanopillars/nanowires in one-dimensional (1D) geometry are building blocks for nano-photonics. They also hold potential for efficient polarized spin-light conversion in future spin nano-photonics. Unfortunately, spin generation in 1D systems so far remains inefficient at room temperature. Here we propose an approach that can significantly enhance the radiative efficiency of the electrons with the desired spin while suppressing that with the unwanted spin, which simultaneously ensures strong spin and light polarization. We demonstrate high optical polarization of 20%, inferring high electron spin polarization up to 60% at room temperature in a 1D system based on a GaNAs nanodisk-in-GaAs nanopillar structure, facilitated by spin-dependent recombination via merely 2–3 defects in each nanodisk. Our approach points to a promising direction for realization of an interface for efficient spin-photon quantum information transfer at room temperature—a key element for future spin-photonic applications.

Date: 2018
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DOI: 10.1038/s41467-018-06035-1

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