Enhanced ultrafast relaxation rate in the Weyl semimetal phase of MoTe2 measured by time- and angle-resolved photoelectron spectroscopy


JSON Export

{
  "id": "809", 
  "updated": "2021-04-09T07:57:49.042212+00:00", 
  "metadata": {
    "description": "This record contains the results of the first experimental investigation of the change in the electron dynamics across the topological phase transition from the type-II Weyl semimetal phase of MoTe2 to the trivial phase. By using the capability of time-resolved ARPES to access the unoccupied density of states, we succeed in transiently populating the Weyl points, which are otherwise above the Fermi level and out of the reach of conventional ARPES. We observe a bottleneck in the electron dynamics when the Weyl points annihilate and gaps are opened in the high-temperature trivial phase. This interpretation is supported by the observation that, in the \u201csister\u201d compound WTe2 the dynamics is not affected by the change in temperature, and it is always much slower, thus reflecting the larger energy separation between the valence and conduction band.", 
    "contributors": [
      {
        "email": "alberto.crepaldi@epfl.ch", 
        "givennames": "Alberto", 
        "affiliations": [
          "Institute of Physics, Ecole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland"
        ], 
        "familyname": "Crepaldi"
      }, 
      {
        "affiliations": [
          "Institute of Physics, Ecole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland", 
          "National Centre for Computational Design and Discovery of Novel Materials MARVEL, Ecole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland"
        ], 
        "givennames": "Gabriel", 
        "familyname": "Aut\u00e8s"
      }, 
      {
        "affiliations": [
          "Institute of Physics, Ecole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland"
        ], 
        "givennames": "Gianmarco", 
        "familyname": "Gatti"
      }, 
      {
        "affiliations": [
          "Institute of Physics, Ecole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland"
        ], 
        "givennames": "Silvan", 
        "familyname": "Roth"
      }, 
      {
        "affiliations": [
          "Universit\u00e0 degli Studi di Trieste, Via A. Valerio 2, I-34127 Trieste, Italy"
        ], 
        "givennames": "Andrea", 
        "familyname": "Sterzi"
      }, 
      {
        "affiliations": [
          "Universit\u00e0 degli Studi di Trieste, Via A. Valerio 2, I-34127 Trieste, Italy"
        ], 
        "givennames": "Giulia", 
        "familyname": "Manzoni"
      }, 
      {
        "affiliations": [
          "C.N.R.\u2013I.O.M., Strada Statale 14, km 163.5, Trieste 34149, Italy"
        ], 
        "givennames": "Michele", 
        "familyname": "Zacchigna"
      }, 
      {
        "affiliations": [
          "Central Laser Facility, STFC Rutherford Appleton Laboratory, Harwell OX11 0QX, United Kingdom"
        ], 
        "givennames": "Cephice", 
        "familyname": "Cacho"
      }, 
      {
        "affiliations": [
          "Central Laser Facility, STFC Rutherford Appleton Laboratory, Harwell OX11 0QX, United Kingdom"
        ], 
        "givennames": "Richard T.", 
        "familyname": "Chapman"
      }, 
      {
        "affiliations": [
          "Central Laser Facility, STFC Rutherford Appleton Laboratory, Harwell OX11 0QX, United Kingdom"
        ], 
        "givennames": "Emma", 
        "familyname": "Springate"
      }, 
      {
        "affiliations": [
          "The Photon Science Institute, The University of Manchester, Manchester M13 9PL, United Kingdom", 
          "The Cockcroft Institute, Sci-Tech Daresbury, Daresbury, Warrington WA4 4AD, United Kingdom"
        ], 
        "givennames": "Elaine A.", 
        "familyname": "Seddon"
      }, 
      {
        "affiliations": [
          "Institute of Physics, Ecole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland"
        ], 
        "givennames": "Philippe", 
        "familyname": "Bugnon"
      }, 
      {
        "affiliations": [
          "Institute of Physics, Ecole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland"
        ], 
        "givennames": "Arnaud", 
        "familyname": "Magrez"
      }, 
      {
        "affiliations": [
          "Institute of Physics, Ecole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland"
        ], 
        "givennames": "Helmuth", 
        "familyname": "Berger"
      }, 
      {
        "affiliations": [
          "C.N.R.\u2013I.O.M., Strada Statale 14, km 163.5, Trieste 34149, Italy"
        ], 
        "givennames": "Ivana", 
        "familyname": "Vobornik"
      }, 
      {
        "affiliations": [
          "Institut fu\u0308r Experimentelle und Angewandte Physik, Christian-Albrechts-Universit\u00e4t zu Kiel, 24098 Kiel, Germany"
        ], 
        "givennames": "Matthias", 
        "familyname": "Kall\u00e4ne"
      }, 
      {
        "affiliations": [
          "Institut fu\u0308r Experimentelle und Angewandte Physik, Christian-Albrechts-Universit\u00e4t zu Kiel, 24098 Kiel, Germany"
        ], 
        "givennames": "Arndt", 
        "familyname": "Quer"
      }, 
      {
        "affiliations": [
          "Institut fu\u0308r Experimentelle und Angewandte Physik, Christian-Albrechts-Universit\u00e4t zu Kiel, 24098 Kiel, Germany"
        ], 
        "givennames": "Kai", 
        "familyname": "Rossnagel"
      }, 
      {
        "affiliations": [
          "Universit\u00e0 degli Studi di Trieste, Via A. Valerio 2, I-34127 Trieste, Italy", 
          "Elettra - Sincrotrone Trieste S.C.p.A., Strada Statale 14, km 163.5, Trieste 34149, Italy", 
          "International Faculty - University of K\u00f6ln, 50937 K\u00f6ln, Germany"
        ], 
        "givennames": "Fulvio", 
        "familyname": "Parmigiani"
      }, 
      {
        "affiliations": [
          "Institute of Physics, Ecole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland", 
          "National Centre for Computational Design and Discovery of Novel Materials MARVEL, Ecole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland"
        ], 
        "givennames": "Oleg V.", 
        "familyname": "Yazyev"
      }, 
      {
        "affiliations": [
          "Institute of Physics, Ecole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland"
        ], 
        "givennames": "Marco", 
        "familyname": "Grioni"
      }
    ], 
    "title": "Enhanced ultrafast relaxation rate in the Weyl semimetal phase of MoTe2 measured by time- and angle-resolved photoelectron spectroscopy", 
    "license_addendum": null, 
    "mcid": "2021.57", 
    "id": "809", 
    "is_last": true, 
    "_oai": {
      "id": "oai:materialscloud.org:809"
    }, 
    "publication_date": "Apr 09, 2021, 09:57:48", 
    "edited_by": 100, 
    "status": "published", 
    "version": 1, 
    "license": "Creative Commons Attribution 4.0 International", 
    "_files": [
      {
        "key": "Data.zip", 
        "size": 4056800, 
        "description": "Compressed folder containing the data, divided in folders according to the Figure panels as described in the README file.", 
        "checksum": "md5:354f8269654de7738953fcc85cec59b7"
      }, 
      {
        "key": "README.txt", 
        "size": 1310, 
        "description": "Information about how the data have been exported in .txt and how to fully reconstruct the raw data.", 
        "checksum": "md5:e48c3108537994157722bef5abdb91ae"
      }
    ], 
    "owner": 348, 
    "keywords": [
      "Electronic bands", 
      "Electron dynamics", 
      "Type-II Weyl semimetal", 
      "Topological phase transition", 
      "Experimental", 
      "SNSF", 
      "MARVEL", 
      "ERC"
    ], 
    "references": [
      {
        "type": "Journal reference", 
        "url": "https://journals.aps.org/prb/abstract/10.1103/PhysRevB.96.241408", 
        "doi": "10.1103/PhysRevB.96.241408", 
        "citation": "A. Crepaldi et al., Physical Review B 96, 241408(R) (2017)", 
        "comment": "Preprint available at arXiv:1709.09854"
      }
    ], 
    "conceptrecid": "808", 
    "doi": "10.24435/materialscloud:ws-za"
  }, 
  "revision": 4, 
  "created": "2021-04-02T11:09:54.125812+00:00"
}