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journal article·2023-03-01Open access

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

Fabio Bussolotti, Hiroyo Kawai, Ivan Verzhbitskiy, Wei Tao, Duc-Quan Ho, Anirban Das, Junxiang Jia, Shantanu Mukherjee, Bent Weber, Kuan Eng Johnson Goh

AIP Advances· Volume 13· Issue 3
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Source abstract

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.
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Research context

OpenAlex topics: Topological Materials and Phenomena · Graphene research and applications · 2D Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Institute of Materials Research and Engineering, Agency for Science Technology and Research (A∗STAR) 1 , 2 Fusionopolis Way, #08-03 Innovis, Singapore 138634, Republic of Singapore

Institute of High Performance Computing, Agency for Science, Technology and Research 2 , 1 Fusionopolis Way, #16-16 Connexis, Singapore 138632, Republic of Singapore

Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University 3 , 50 Nanyang Avenue, 639798, Singapore

Department of Physics, Indian Institute of Technology Madras 4 , Chennai 600036, India

Department of Physics, National University of Singapore 5 , 2 Science Drive 3, Singapore 117551, Singapore

Funding

National Research Foundation Singapore · Agency for Science, Technology and Research

References (22)

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