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  • Letter
  • Open Access

Correlation between electronic and structural orders in 1T−TiSe2

Hiroki Ueda1,*,§, Michael Porer1,*, José R. L. Mardegan1,†, Sergii Parchenko1,‡, Namrata Gurung2,3, Federica Fabrizi4, Mahesh Ramakrishnan1, Larissa Boie5, Martin Josef Neugebauer5 et al.

Bulat Burganov5, Max Burian1, Steven Lee Johnson5,6, Kai Rossnagel7,8, and Urs Staub1,§

  • 1Swiss Light Source, Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland
  • 2Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland
  • 3Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland
  • 4Diamond Light Source Ltd., Diamond House, Harwell Science & Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
  • 5Institute for Quantum Electronics, Physics Department, ETH Zurich, 8093 Zurich, Switzerland
  • 6Laboratory for Non-linear Optics, Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland
  • 7Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
  • 8Ruprecht-Haensel-Labor, Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany

  • *These authors contributed equally to this work.
  • †Present address: Deutsches Elektronen-Synchrotron DESY, 22603 Hamburg, Germany.
  • ‡Present address: Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland.
  • §Corresponding authors: hiroki.ueda@psi.ch; urs.staub@psi.ch
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Phys. Rev. Research 3, L022003 – Published 5 April, 2021

DOI: https://doi.org/10.1103/PhysRevResearch.3.L022003

Abstract

The correlation between electronic and crystal structures of 1T−TiSe2 in the charge-density wave (CDW) state is studied by x-ray diffraction in order to clarify basic properties in the CDW state, transport properties, and chirality. Three families of reflections are used to probe atomic displacements and the orbital asymmetry in Se. Two distinct onset temperatures are found: TCDW and a lower T* indicative for an onset of Se out-of-plane atomic displacements. T* coincides with a DC resistivity maximum and the onset of the proposed gyrotropic (chiral) electronic structure. However, no indication for chirality is found. The relation between the atomic displacements and the transport properties is discussed in terms of Ti 3d and Se 4p states that only weakly couple to the CDW order.

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Phys. Rev. Research 3, L022003– Published 5 April, 2021
  • Received 17 June 2020
  • Revised 19 February 2021
  • Accepted 8 March 2021
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