@article{8c1d5c409c4444b39b4eafc4f4deb93c,
title = "Temperature-driven topological transition in 1T'-MoTe2 ",
abstract = "The topology of Weyl semimetals requires the existence of unique surface states. Surface states have been visualized in spectroscopy measurements, but their connection to the topological character of the material remains largely unexplored. 1T'-MoTe2, presents a unique opportunity to study this connection. This material undergoes a phase transition at 240 K that changes the structure from orthorhombic (putative Weyl semimetal) to monoclinic (trivial metal), while largely maintaining its bulk electronic structure. Here, we show from temperature-dependent quasiparticle interference measurements that this structural transition also acts as a topological switch for surface states in 1T'-MoTe2. At low temperature, we observe strong quasiparticle scattering, consistent with theoretical predictions and photoemission measurements for the surface states in this material. In contrast, measurements performed at room temperature show the complete absence of the scattering wavevectors associated with the trivial surface states. These distinct quasiparticle scattering behaviors show that 1T'-MoTe2 is ideal for separating topological and trivial electronic phenomena via temperature-dependent measurements.",
author = "Berger, {Ayelet Notis} and Erick Andrade and Alexander Kerelsky and Drew Edelberg and Jian Li and Zhijun Wang and Lunyong Zhang and Jaewook Kim and Nader Zaki and Jose Avila and Chaoyu Chen and Asensio, {Maria C.} and Cheong, {Sang Wook} and Bernevig, {Bogdan A.} and Pasupathy, {Abhay N.}",
note = "Funding Information: This work is supported by the National Science Foundation (NSF) via the Materials Research Science and Engineering Center at Columbia University (grant DMR 1420634), by grant DMR-1610110 (A.N.) and by the Office of Naval Research grant number N00014-14-1-0501 (E.A.). Equipment support is provided by the Air Force Office of Scientific Research (grant number FA9550-16-1-0601) and FA9550-16-1-0031, J.P.). B.A.B. acknowledges support from NSF EAGER Award NOA–AWD1004957, ONR–N00014-14-1-0330, ARO MURI W911NF-12-1-0461, NSF-MRSEC DMR-1420541. Z. J.W.{\textquoteright}s work was supported by Department of Energy de-sc0016239, Simons Investigator Award, Packard Foundation and Schmidt Fund for Innovative Research. The work at Postech was supported by the Max Planck POSTECH/KOREA Research Initiative Program through National Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (No. 2016K1A4A4A01922028). The work at Rutgers was funded by the Gordon and Betty Moore Foundation{\textquoteright}s EPiOS Initiative through Grant GBMF4413 to the Rutgers Center for Emergent Materials. N.Z. acknowledges support by the NSF MRSEC program through Columbia in the Center for Precision Assembly of Superstratic and Superatomic Solids (DMR-1420634). M.C.A., J.A., and C.C. acknowledge Synchrotron SOLEIL, which is supported by the Center National de la Recherche Scientifique (CNRS) and the Commissariat a{\textquoteleft} l{\textquoteright}Energie Atomique et aux Energies Alternatives (CEA), France. Publisher Copyright: {\textcopyright} 2018 The Author(s).",
year = "2018",
month = dec,
day = "1",
doi = "10.1038/s41535-017-0075-y",
language = "English (US)",
volume = "3",
journal = "npj Quantum Materials",
issn = "2397-4648",
publisher = "Nature Publishing Group",
number = "1",
}