English  |  正體中文  |  简体中文  |  Items with full text/Total items : 56829/90592 (63%)
Visitors : 12145091      Online Users : 148
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version
    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/117382


    Title: A strongly robust type II Weyl fermion semimetal state in Ta3S2
    Authors: Chang, Guoqing;Xu, Su-Yang;Sanchez, Daniel S.;Huang, Shin-Ming;Lee, Chi-Cheng;Chang, Tay-Rong;Bian, Guang;Zheng, Hao;Belopolski, Ilya;Alidoust, Nasser;Jeng, Horng-Tay;Bansil, Arun;Lin, Hsin;Hasan, M. Zahid
    Keywords: Weyl fermion;Fermi arc;Topology
    Date: 2016-06-03
    Issue Date: 2019-10-15 12:10:57 (UTC+8)
    Abstract: Weyl semimetals are of great interest because they provide the first realization of the Weyl fermion, exhibit exotic quantum anomalies, and host Fermi arc surface states. The separation between Weyl nodes of opposite chirality gives a measure of the robustness of the Weyl semimetal state. To exploit the novel phenomena that arise from Weyl fermions in applications, it is crucially important to find robust separated Weyl nodes. We propose a methodology to design robust Weyl semimetals with well-separated Weyl nodes. Using this methodology as a guideline, we search among the material parameter space and identify by far the most robust and ideal Weyl semimetal candidate in the single-crystalline compound tantalum sulfide (Ta3S2) with new and novel properties beyond TaAs. Crucially, our results show that Ta3S2 has the largest k-space separation between Weyl nodes among known Weyl semimetal candidates, which is about twice larger than the measured value in TaAs and 20 times larger than the predicted value in WTe2. Moreover, all Weyl nodes in Ta3S2 are of type II. Therefore, Ta3S2 is a type II Weyl semimetal. Furthermore, we predict that increasing the lattice by <4% can annihilate all Weyl nodes, driving a novel topological metal-to-insulator transition from a Weyl semimetal state to a topological insulator state. The robust type II Weyl semimetal state and the topological metal-to-insulator transition in Ta3S2 are potentially useful in device applications. Our methodology can be generally applied to search for new Weyl semimetals.
    Relation: Science Advances 2(6), e1600295
    DOI: 10.1126/sciadv.1600295
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

    Files in This Item:

    File Description SizeFormat
    A strongly robust type II Weyl fermion semimetal state in Ta3S2.pdf2378KbAdobe PDF0View/Open
    index.html0KbHTML35View/Open

    All items in 機構典藏 are protected by copyright, with all rights reserved.


    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - Feedback