Interlayer hybridization in a van der Waals quantum spin-Hall insulator/superconductor heterostructure

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Interlayer hybridization in a van der Waals quantum spin-Hall insulator/superconductor heterostructure
Title:
Interlayer hybridization in a van der Waals quantum spin-Hall insulator/superconductor heterostructure
Journal Title:
AIP Advances
Publication Date:
08 March 2023
Citation:
Bussolotti, F., Kawai, H., Verzhbitskiy, I., Tao, W., Ho, D.-Q., Das, A., Jia, J., Mukherjee, S., Weber, B., & Johnson Goh, K. E. (2023). Interlayer hybridization in a van der Waals quantum spin-Hall insulator/superconductor heterostructure. AIP Advances, 13(3). https://doi.org/10.1063/5.0130393
Abstract:
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.
License type:
Attribution 4.0 International (CC BY 4.0)
Funding Info:
This research / project is supported by the National Research Foundation (NRF) - Competitive Research Program
Grant Reference no. : NRF-CRP21-2018-0001

This research / project is supported by the Ministry of Education (MOE) - Academic Research Fund Tier 3
Grant Reference no. : MOE2018-T3-1-002

This research / project is supported by the National Research Foundation (NRF) - NRF Fellowship
Grant Reference no. : NRF-NRFF2017-11

This research / project is supported by the Agency for Science, Technology and Research - NA
Grant Reference no. : 21709
Description:
ISSN:
2158-3226