Interlayer hybridization in a van der Waals quantum spin-Hall insulator/superconductor heterostructure
In this work, we present an angle-resolved photoemission spectroscopy study of a 1T′-WTe2 monolayer epitaxially grown on NbSe2 substrates, a prototypical quantum spin Hall insulator (QSHI)/superconductor heterojunction. Angle-resolved photoemission spectroscopy data indicate the formation of electro...
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sg-ntu-dr.10356-1687802023-06-19T15:34:36Z Interlayer hybridization in a van der Waals quantum spin-Hall insulator/superconductor heterostructure Bussolotti, Fabio Kawai, Hiroyo Verzhbitskiy, Ivan Tao, Wei Ho, Duc-Quan Das, Anirban Jia, Junxiang Mukherjee, Shantanu Weber, Bent Goh, Johnson Kuan Eng School of Physical and Mathematical Sciences Institute of Materials Research and Engineering, A*STAR Department of Physics, NUS Science::Physics Quantum Spin Halls Van der Waal In this work, we present an angle-resolved photoemission spectroscopy study of a 1T′-WTe2 monolayer epitaxially grown on NbSe2 substrates, a prototypical quantum spin Hall insulator (QSHI)/superconductor heterojunction. Angle-resolved photoemission spectroscopy data indicate the formation of electronic states in the bulk bandgap of WTe2, which are absent in the nearly free-standing WTe2 grown on the highly oriented pyrolytic graphite substrate, where an energy gap of ∼100 meV is reported. The results are explained in terms of hybridization effects promoted by the QSHI-superconductor interaction at WTe2/NbSe2 interfaces, in line with recent scanning probe microscopy investigation and theoretical band structure calculations. Our findings highlight the important role of interlayer interaction on the electronic properties and ultimately on the engineering of topological properties of the QSHI/superconducting heterostructure. Agency for Science, Technology and Research (A*STAR) Ministry of Education (MOE) National Research Foundation (NRF) Published version This research was supported by the National Research Foundation (NRF) Singapore, under the Competitive Research Program “Toward On-Chip Topological Quantum Devices” (Grant No. NRFCRP21-2018-0001) F.B., H.K., I.V., and K.E.J.G. acknowledge the funding support from the Agency for Science, Technology and Research (Grant No. 21709). B.W. acknowledges support from the Singapore Ministry of Education (MOE) Academic Research Fund Tier 3 Grant (No. MOE2018-T3-1-002) and acknowledges the Singapore National Research Foundation (NRF) Fellowship (Grant No. NRF-NRFF2017-11). 2023-06-19T05:47:18Z 2023-06-19T05:47:18Z 2023 Journal Article Bussolotti, F., Kawai, H., Verzhbitskiy, I., Tao, W., Ho, D., Das, A., Jia, J., Mukherjee, S., Weber, B. & Goh, J. K. E. (2023). Interlayer hybridization in a van der Waals quantum spin-Hall insulator/superconductor heterostructure. AIP Advances, 13(3), 035115-. https://dx.doi.org/10.1063/5.0130393 2158-3226 https://hdl.handle.net/10356/168780 10.1063/5.0130393 2-s2.0-85149814759 3 13 035115 en NRFCRP21-2018-0001 21709 MOE2018-T3-1-002 NRF-NRFF2017-11 AIP Advances © 2023 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). application/pdf |
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Science::Physics Quantum Spin Halls Van der Waal Bussolotti, Fabio Kawai, Hiroyo Verzhbitskiy, Ivan Tao, Wei Ho, Duc-Quan Das, Anirban Jia, Junxiang Mukherjee, Shantanu Weber, Bent Goh, Johnson Kuan Eng Interlayer hybridization in a van der Waals quantum spin-Hall insulator/superconductor heterostructure |
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In this work, we present an angle-resolved photoemission spectroscopy study of a 1T′-WTe2 monolayer epitaxially grown on NbSe2 substrates, a prototypical quantum spin Hall insulator (QSHI)/superconductor heterojunction. Angle-resolved photoemission spectroscopy data indicate the formation of electronic states in the bulk bandgap of WTe2, which are absent in the nearly free-standing WTe2 grown on the highly oriented pyrolytic graphite substrate, where an energy gap of ∼100 meV is reported. The results are explained in terms of hybridization effects promoted by the QSHI-superconductor interaction at WTe2/NbSe2 interfaces, in line with recent scanning probe microscopy investigation and theoretical band structure calculations. Our findings highlight the important role of interlayer interaction on the electronic properties and ultimately on the engineering of topological properties of the QSHI/superconducting heterostructure. |
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School of Physical and Mathematical Sciences |
author_facet |
School of Physical and Mathematical Sciences Bussolotti, Fabio Kawai, Hiroyo Verzhbitskiy, Ivan Tao, Wei Ho, Duc-Quan Das, Anirban Jia, Junxiang Mukherjee, Shantanu Weber, Bent Goh, Johnson Kuan Eng |
format |
Article |
author |
Bussolotti, Fabio Kawai, Hiroyo Verzhbitskiy, Ivan Tao, Wei Ho, Duc-Quan Das, Anirban Jia, Junxiang Mukherjee, Shantanu Weber, Bent Goh, Johnson Kuan Eng |
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Bussolotti, Fabio |
title |
Interlayer hybridization in a van der Waals quantum spin-Hall insulator/superconductor heterostructure |
title_short |
Interlayer hybridization in a van der Waals quantum spin-Hall insulator/superconductor heterostructure |
title_full |
Interlayer hybridization in a van der Waals quantum spin-Hall insulator/superconductor heterostructure |
title_fullStr |
Interlayer hybridization in a van der Waals quantum spin-Hall insulator/superconductor heterostructure |
title_full_unstemmed |
Interlayer hybridization in a van der Waals quantum spin-Hall insulator/superconductor heterostructure |
title_sort |
interlayer hybridization in a van der waals quantum spin-hall insulator/superconductor heterostructure |
publishDate |
2023 |
url |
https://hdl.handle.net/10356/168780 |
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1772826652158459904 |