Surface superconductivity in the type Ⅱ Weyl semimetal TaIrTe4
Surface superconductivity in the type Ⅱ Weyl semimetal TaIrTe4作者机构：Department of Materials Science and EngineeringCollege of New Energy and Materials China University of Petroleum International Center for Quantum Materials School of Physics Peking University School of Physics and Information TechnologyShaanxi Normal University School of PhysicsHuazhong University of Science and Technology Wuhan National High Magnetic Field CenterHuazhong University of Science and Technology Center of Electron Microscopy State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Department of Materials Science and EngineeringUniversity of Tennessee Department of Physics and Astronomy University of Tennessee Materials Science and Technology Division Oak Ridge National Laboratory Department of Condensed Matter Physics Weizmann Institute of Science CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing Academy of Quantum Information Sciences Collaborative Innovation Center of Quantum Matter
出 版 物：《National Science Review》 (国家科学评论(英文版))
年 卷 期：2020年第7卷第3期
页 面：579-587页
核心收录：
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
基 金：supported by the National Key Research and Development Program of China (2018YFA0305604,2017YFA0303302 and 2016YFA0301604) the National Natural Science Foundation of China (11888101,11774008,11574095,11704414,11574008,11761161003,11825401,11921005 and11974430) the Beijing Natural Science Foundation (Z180010) the Science Foundation of China University of Petroleum,Beijing (2462017YJRC012 and 2462018BJC005) the Strategic Priority Research Program of Chinese Academy of Sciences (XDB28000000) partially supported by the CEM,an NSF MRSEC (DMR-1420451) supported by the US Department of Energy,Office of Science,Basic Energy Sciences,Materials Sciences and Engineering Division (J.Y.) support from the Gordon and Betty Moore Foundation’s EPiQS Initiative (GBMF4416) the financial support by the Willner Family Leadership Institute for the Weizmann Institute of Science the Benoziyo Endowment Fund for the Advancement of Science the Ruth and Herman Albert Scholars Program for New Scientists the European Research Council (ERC) under the EuropeanUnion’s Horizon 2020 Research and Innovation Programme(815869)
主 题：surface superconductivity Weyl semimetal topological superconductivity
摘 要：The search for unconventional superconductivity in Weyl semimetal materials is currently an exciting pursuit, since such superconducting phases could potentially be topologically non-trivial and host exotic Majorana modes. The layered material TaIrTe4is a newly predicted time-reversal invariant type Ⅱ Weyl semimetal with the minimum number of Weyl points. Here, we report the discovery of surface superconductivity in Weyl semimetal Ta Ir Te4. Our scanning tunneling microscopy/spectroscopy(STM/STS) visualizes Fermi arc surface states of TaIrTe4that are consistent with the previous angle-resolved photoemission spectroscopy results. By a systematic study based on STS at ultralow temperature, we observe uniform superconducting gaps on the sample surface. The superconductivity is further confirmed by electrical transport measurements at ultralow temperature, with an onset transition temperature(Tc) up to 1.54 K being observed. The normalized upper critical field h*(T/Tc) behavior and the stability of the superconductivity against the ferromagnet indicate that the discovered superconductivity is unconventional with the p-wave pairing. The systematic STS, and thickness-and angular-dependent transport measurements reveal that the detected superconductivity is quasi-1 D and occurs in the surface states. The discovery of the surface superconductivity in TaIrTe4provides a new novel platform to explore topological superconductivity and Majorana modes.
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