Controllable superconducting to semiconducting phase transition in topological superconductor 2M-WS2

Gautam, Sabin; McBride, Joseph; Scougale, William Roger; Samarawickrama, Piumi Indrachapa; de Camargo Branco, Danilo; Yang, Peilin; Fu, ZhuangEn; Wang, Wenyong; Tang, Jinke; Cheng, Gary J.; Ackerman, John; Chien, TeYu; Leonard, Brian; Tian, Jifa

doi:10.1088/2053-1583/ad10bb

Controllable superconducting to semiconducting phase transition in topological superconductor 2M-WS₂

Journal Article · Wed Nov 29 00:00:00 EST 2023 · 2D Materials

DOI:https://doi.org/10.1088/2053-1583/ad10bb· OSTI ID:2222843

Gautam, Sabin ^[1]; McBride, Joseph ^[2]; Scougale, William Roger ^[2]; Samarawickrama, Piumi Indrachapa ^[2]; de Camargo Branco, Danilo ^[3]; Yang, Peilin ^[3]; Fu, ZhuangEn ^[2]; Wang, Wenyong ^[2]; Tang, Jinke ^[2]; ^[3]; Ackerman, John ^[2]; ^[2]; ^[4]; ^[2]

University of Wyoming, Laramie, WY (United States); University of Wyoming
University of Wyoming, Laramie, WY (United States)
Purdue University, West Lafayette, IN (United States)
Wyoming University, Laramie, WY (United States)

The investigation of exotic properties in two-dimensional (2D) topological superconductors has garnered increasing attention in condensed matter physics, particularly for applications in topological qubits. Despite this interest, a reliable way of fabricating topological Josephson junctions (JJs) utilizing topological superconductors has yet to be demonstrated. Controllable structural phase transition presents a unique approach to achieving topological JJs in atomically thin 2D topological superconductors. In this work, we report the pioneering demonstration of a structural phase transition from the superconducting to the semiconducting phase in the 2D topological superconductor 2M-WS₂. We reveal that the metastable 2M phase of WS₂ remains stable in ambient conditions but transitions to the 2H phase when subjected to temperatures above 150°C. We further locally induced the 2H phase within 2M-WS₂ nanolayers using laser irradiation. Notably, the 2H phase region exhibits a hexagonal shape, and scanning tunneling microscopy (STM) uncovers an atomically sharp crystal structural transition between the 2H and 2M phase regions. Moreover, the 2M to 2H phase transition can be induced at the nanometer scale by a 200 keV electron beam. The electrical transport measurements further confirmed the superconductivity of the pristine 2M-WS₂ and the semiconducting behavior of the laser-irradiated 2M-WS₂. Furthermore, our results establish a novel approach for controllable topological phase change in 2D topological superconductors, significantly impacting the development of atomically scaled planar topological JJs.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Wyoming, Laramie, WY (United States); University of Wyoming, Laramie, WY (United States)

Sponsoring Organization:: U.S. National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: SC0021281; SC0024188

OSTI ID:: 2222843

Alternate ID(s):: OSTI ID: 2335862
OSTI ID: 2335863
OSTI ID: 2341715
OSTI ID: 2553073

Journal Information:: 2D Materials, Journal Name: 2D Materials Journal Issue: 1 Vol. 11; ISSN 2053-1583

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Controllable superconducting to semiconducting phase transition in topological superconductor 2M-WS2

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Controllable superconducting to semiconducting phase transition in topological superconductor 2M-WS₂