Please use this identifier to cite or link to this item: https://doi.org/10.1038/s41467-018-03897-3
Title: Accessing valley degree of freedom in bulk Tin(II) sulfide at room temperature
Authors: Lin, S
Carvalho, A 
Yan, S
Li, R
Kim, S
Rodin, A 
Carvalho, L 
Chan, E.M
Wang, X
Castro Neto, A.H 
Yao, J
Keywords: sulfide
tin
anisotropy
experimental study
optical method
polarization
sulfide
temperature effect
tin
two-dimensional modeling
absorption
anisotropy
Article
crystal structure
density functional theory
electrical parameters
electromagnetic radiation
energy dispersive X ray spectroscopy
oscillation
photoluminescence
polarization microscopy
room temperature
scanning electron microscopy
surface property
temperature dependence
valleytronic system
volume
Issue Date: 2018
Publisher: Nature Publishing Group
Citation: Lin, S, Carvalho, A, Yan, S, Li, R, Kim, S, Rodin, A, Carvalho, L, Chan, E.M, Wang, X, Castro Neto, A.H, Yao, J (2018). Accessing valley degree of freedom in bulk Tin(II) sulfide at room temperature. Nature Communications 9 (1) : 1455. ScholarBank@NUS Repository. https://doi.org/10.1038/s41467-018-03897-3
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. © 2018 The Author(s).
Source Title: Nature Communications
URI: https://scholarbank.nus.edu.sg/handle/10635/174230
ISSN: 2041-1723
DOI: 10.1038/s41467-018-03897-3
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