Observation of topologically protected states at crystalline phase boundaries in single-layer WSe2
Abstract
Transition metal dichalcogenide materials are unique in the wide variety of structural and electronic phases they exhibit in the two-dimensional limit. Here we show how such polymorphic flexibility can be used to achieve topological states at highly ordered phase boundaries in a new quantum spin Hall insulator (QSHI), 1T'-WSe2. We observe edge states at the crystallographically aligned interface between a quantum spin Hall insulating domain of 1T'-WSe2 and a semiconducting domain of 1H-WSe2 in contiguous single layers. The QSHI nature of single-layer 1T'-WSe2 is verified using angle-resolved photoemission spectroscopy to determine band inversion around a 120 meV energy gap, as well as scanning tunneling spectroscopy to directly image edge-state formation. Using this edge-state geometry we confirm the predicted penetration depth of one-dimensional interface states into the two-dimensional bulk of a QSHI for a well-specified crystallographic direction. In conclusion, these interfaces create opportunities for testing predictions of the microscopic behavior of topologically protected boundary states.
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1465222
- Alternate Identifier(s):
- OSTI ID: 1475489; OSTI ID: 1477419
- Grant/Contract Number:
- AC02-05CH11231; AC02-76SF00515; MAT2017-88377-C2-1-R; 306504; EFMA-1542741
- Resource Type:
- Published Article
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Name: Nature Communications Journal Volume: 9 Journal Issue: 1; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Ugeda, Miguel M., Pulkin, Artem, Tang, Shujie, Ryu, Hyejin, Wu, Quansheng, Zhang, Yi, Wong, Dillon, Pedramrazi, Zahra, Martín-Recio, Ana, Chen, Yi, Wang, Feng, Shen, Zhi-Xun, Mo, Sung-Kwan, Yazyev, Oleg V., and Crommie, Michael F. Observation of topologically protected states at crystalline phase boundaries in single-layer WSe2. United Kingdom: N. p., 2018.
Web. doi:10.1038/s41467-018-05672-w.
Ugeda, Miguel M., Pulkin, Artem, Tang, Shujie, Ryu, Hyejin, Wu, Quansheng, Zhang, Yi, Wong, Dillon, Pedramrazi, Zahra, Martín-Recio, Ana, Chen, Yi, Wang, Feng, Shen, Zhi-Xun, Mo, Sung-Kwan, Yazyev, Oleg V., & Crommie, Michael F. Observation of topologically protected states at crystalline phase boundaries in single-layer WSe2. United Kingdom. https://doi.org/10.1038/s41467-018-05672-w
Ugeda, Miguel M., Pulkin, Artem, Tang, Shujie, Ryu, Hyejin, Wu, Quansheng, Zhang, Yi, Wong, Dillon, Pedramrazi, Zahra, Martín-Recio, Ana, Chen, Yi, Wang, Feng, Shen, Zhi-Xun, Mo, Sung-Kwan, Yazyev, Oleg V., and Crommie, Michael F. Fri .
"Observation of topologically protected states at crystalline phase boundaries in single-layer WSe2". United Kingdom. https://doi.org/10.1038/s41467-018-05672-w.
@article{osti_1465222,
title = {Observation of topologically protected states at crystalline phase boundaries in single-layer WSe2},
author = {Ugeda, Miguel M. and Pulkin, Artem and Tang, Shujie and Ryu, Hyejin and Wu, Quansheng and Zhang, Yi and Wong, Dillon and Pedramrazi, Zahra and Martín-Recio, Ana and Chen, Yi and Wang, Feng and Shen, Zhi-Xun and Mo, Sung-Kwan and Yazyev, Oleg V. and Crommie, Michael F.},
abstractNote = {Transition metal dichalcogenide materials are unique in the wide variety of structural and electronic phases they exhibit in the two-dimensional limit. Here we show how such polymorphic flexibility can be used to achieve topological states at highly ordered phase boundaries in a new quantum spin Hall insulator (QSHI), 1T'-WSe2. We observe edge states at the crystallographically aligned interface between a quantum spin Hall insulating domain of 1T'-WSe2 and a semiconducting domain of 1H-WSe2 in contiguous single layers. The QSHI nature of single-layer 1T'-WSe2 is verified using angle-resolved photoemission spectroscopy to determine band inversion around a 120 meV energy gap, as well as scanning tunneling spectroscopy to directly image edge-state formation. Using this edge-state geometry we confirm the predicted penetration depth of one-dimensional interface states into the two-dimensional bulk of a QSHI for a well-specified crystallographic direction. In conclusion, these interfaces create opportunities for testing predictions of the microscopic behavior of topologically protected boundary states.},
doi = {10.1038/s41467-018-05672-w},
journal = {Nature Communications},
number = 1,
volume = 9,
place = {United Kingdom},
year = {2018},
month = {8}
}
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https://doi.org/10.1038/s41467-018-05672-w
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