Accessing valley degree of freedom in bulk Tin(II) sulfide at room temperature
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.
- Authors:
-
[2];
- Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- National Univ. of Singapore (Singapore)
- Nanjing Univ. of Posts and Telecommunications, Nanjing (People's Republic of China)
- Univ. of California, Berkeley, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1460351
- Grant/Contract Number:
- AC02-05CH11231
- Resource 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
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
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., 2018.
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. https://doi.org/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. Fri .
"Accessing valley degree of freedom in bulk Tin(II) sulfide at room temperature". United States. https://doi.org/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 = {Fri Apr 13 00:00:00 EDT 2018},
month = {Fri Apr 13 00:00:00 EDT 2018}
}
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