Accessing valley degree of freedom in bulk Tin(II) sulfide at room temperature

Shuren Lin, Alexandra Carvalho, Shancheng Yan, Roger Li, Sujung Kim, Aleksandr Rodin, Lídia Carvalho, Emory M. Chan, Xi Wang, Antonio H. Castro Neto and Jie Yao ()
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Shuren Lin: University of California
Alexandra Carvalho: National University of Singapore
Shancheng Yan: Nanjing University of Posts and Telecommunications
Roger Li: University of California
Sujung Kim: University of California
Aleksandr Rodin: National University of Singapore
Lídia Carvalho: National University of Singapore
Emory M. Chan: Lawrence Berkeley National Laboratory
Xi Wang: University of California
Antonio H. Castro Neto: National University of Singapore
Jie Yao: University of California

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract The field of valleytronics has promised greater control of electronic and spintronic systems with an additional valley degree of freedom. However, conventional and two-dimensional valleytronic systems pose practical challenges in the utilization of this valley degree of freedom. Here we show experimental evidences of the valley effect in a bulk, ambient, and bias-free model system of Tin(II) sulfide. We elucidate the direct access and identification of different sets of valleys, based primarily on the selectivity in absorption and emission of linearly polarized light by optical reflection/transmission and photoluminescence measurements, and demonstrate strong optical dichroic anisotropy of up to 600% and nominal polarization degrees of up to 96% for the two valleys with band-gap values 1.28 and 1.48 eV, respectively; the ease of valley selection further manifested in their non-degenerate nature. Such discovery enables a new platform for better access and control of valley polarization.

Date: 2018
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DOI: 10.1038/s41467-018-03897-3

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