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

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.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [2] ;  [2] ;  [5] ;  [4] ; ORCiD logo [2] ;  [1]
  1. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. National Univ. of Singapore (Singapore)
  3. Nanjing Univ. of Posts and Telecommunications, Nanjing (People's Republic of China)
  4. Univ. of California, Berkeley, CA (United States)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Related Information: © 2018 The Author(s).; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1460351

Lin, Shuren, Carvalho, Alexandra, Yan, Shancheng, Li, Roger, Kim, Sujung, Rodin, Aleksandr, Carvalho, Lidia, Chan, Emory M., Wang, Xi, Castro Neto, Antonio H., and Yao, Jie. Accessing valley degree of freedom in bulk Tin(II) sulfide at room temperature. United States: N. p., Web. doi:10.1038/s41467-018-03897-3.
Lin, Shuren, Carvalho, Alexandra, Yan, Shancheng, Li, Roger, Kim, Sujung, Rodin, Aleksandr, Carvalho, Lidia, Chan, Emory M., Wang, Xi, Castro Neto, Antonio H., & Yao, Jie. Accessing valley degree of freedom in bulk Tin(II) sulfide at room temperature. United States. doi:10.1038/s41467-018-03897-3.
Lin, Shuren, Carvalho, Alexandra, Yan, Shancheng, Li, Roger, Kim, Sujung, Rodin, Aleksandr, Carvalho, Lidia, Chan, Emory M., Wang, Xi, Castro Neto, Antonio H., and Yao, Jie. 2018. "Accessing valley degree of freedom in bulk Tin(II) sulfide at room temperature". United States. doi:10.1038/s41467-018-03897-3. https://www.osti.gov/servlets/purl/1460351.
@article{osti_1460351,
title = {Accessing valley degree of freedom in bulk Tin(II) sulfide at room temperature},
author = {Lin, Shuren and Carvalho, Alexandra and Yan, Shancheng and Li, Roger and Kim, Sujung and Rodin, Aleksandr and Carvalho, Lidia and Chan, Emory M. and Wang, Xi and Castro Neto, Antonio H. and Yao, Jie},
abstractNote = {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.},
doi = {10.1038/s41467-018-03897-3},
journal = {Nature Communications},
number = 1,
volume = 9,
place = {United States},
year = {2018},
month = {4}
}

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Valley filter and valley valve in graphene
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  • Rycerz, A.; Tworzydło, J.; Beenakker, C. W. J.
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Optical Constants of the Noble Metals
journal, December 1972