Two dimensional 2M-WS<sub>2</sub> nanolayers for superconductivity
ORAL
Abstract
A newly discovered VIB group transition metal dichalcogenide (TMD) material 2M-WS2 has attracted extensive attention due to its interesting physical properties such as topological superconductivity, nodeless superconductivity, and anisotropic Majorana bound states. However, the techniques to grow high-quality 2M-WS2 bulk crystals and the study of their physical properties at the nanometer scale are still limited. Here, we report a new route to grow high-quality 2M-WS2 single crystals and the observation of superconductivity in its thin layers. The crystal structure of the as-grown 2M-WS2 crystals was determined by X-ray diffraction (XRD) and scanning tunneling microscopy (STM). The chemical composition of the 2M-WS2 crystals was determined by energy dispersive x-ray spectroscopy (EDS) analysis. Our low temperature transport measurements demonstrate clear signatures of superconductivity of a 25 nm-thick 2M-WS2 flake with a critical temperature (TC) of ~8.5 K and an upper critical field of ~ 2.5 T at T = 1.5 K. Our work may pave new opportunities in studying the topological superconductivity at the atomic scale in simple 2D TMD materials.
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Presenters
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Piumi Samarawickrama
Physics and Astronomy, University of Wyoming, University of Wyoming
Authors
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Piumi Samarawickrama
Physics and Astronomy, University of Wyoming, University of Wyoming
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Rabindra Dulal
Physics and Astronomy, University of Wyoming, University of Wyoming
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Zhuangen Fu
University of Wyoming
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Uppalaiah Erugu
University of Wyoming
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Wenyong Wang
University of Wyoming
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John Ackerman
Chemical Engineering, University of Wyoming, University of Wyoming
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Brian Leonard
Chemistry, University of Wyoming, University of Wyoming
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Jinke Tang
University of Wyoming
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Te-Yu Chien
Physics and Astronomy, University of Wyoming, University of Wyoming
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Jifa Tian
Physics and Astronomy, University of Wyoming, University of Wyoming