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29 March 2024 |
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Article overview
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One-dimensional states residing on edges and steps in few-layer WTe$_2$ | Artem Kononov
; Gulibusitan Abulizi
; Kejian Qu
; Jiaqiang Yan
; David Mandrus
; Kenji Watanabe
; Takashi Taniguchi
; Christian Schönenberger
; | Date: |
6 Nov 2019 | Abstract: | WTe$_2$ is a layered transitional metal dichalcogenide (TMD) with a number of
intriguing topological properties. The bulk crystal is a Weyl semimetal with
Fermi arc surface states and the monolayer is a two-dimensional (2D)
topological insulator. Recently, WTe$_2$ has also been predicted to be a
higher-order topological insulator (HOTI) with hinge states along the edges.
The gapless nature of WTe$_2$ complicates the observation of one-dimensional
(1D) topological states in transport due to their small contribution relative
to the bulk. Here, the Josephson effect can help to detect the edge transport,
since the evolution of the critical current in magnetic field is sensitive to
the spatial current distribution. Here, we employ superconducting contacts in
WTe$_2$ that emerge when Pd is placed in contact with the TMD to define
Josephson junctions. Using the Josephson effect, we demonstrate the presence of
1D current carrying states residing on the edges and steps of few-layer WTe$_2$
crystals. The width of the 1D current-carrying states is deduced to be below 80
nm. A supercurrent $I_c$ is measured over distances up to 3 $mu$m and
persisting in magnetic fields up to $B=2$ T. This observation is in good
agreement with the recent prediction of HOTI states in WTe$_2$. Moreover, the
observed dependencies of $I_c(B)$ on magnetic field demonstrate a particular
symmetry with the direction of the current and the magnetic field, which
matches the prediction for topological states in systems with broken inversion
symmetry. Our observation adds another effect to a plethora of intriguing
properties of WTe$_2$ and potentially provides a new platform for obtaining
Majorana zero modes. | Source: | arXiv, 1911.2414 | Services: | Forum | Review | PDF | Favorites |
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