Three-Dimensional Electron Realm in VSe2 by Soft-X-Ray Photoelectron Spectroscopy: Origin of Charge-Density Waves

Vladimir N. Strocov, Ming Shi, Masaki Kobayashi, Claude Monney, Xiaoqiang Wang, Juraj Krempasky, Thorsten Schmitt, Luc Patthey, Helmuth Berger, and Peter Blaha
Phys. Rev. Lett. 109, 086401 – Published 20 August 2012
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Abstract

The resolution of angle-resolved photoelectron spectroscopy (ARPES) in three-dimensional (3D) momentum k is fundamentally limited by ill defined surface-perpendicular wave vector k associated with the finite photoelectron mean free path. Pushing ARPES into the soft-x-ray energy region sharpens the k definition, allowing accurate electronic structure investigations in 3D materials. We apply soft-x-ray ARPES to explore the 3D electron realm in a paradigm transition metal dichalcogenide VSe2. Essential to break through the dramatic loss of the valence band photoexcitation cross section at soft-x-ray energies is the advanced photon flux performance of our synchrotron instrumentation. By virtue of the sharp 3D momentum definition, the soft-x-ray ARPES experimental band structure and Fermi surface of VSe2 show a textbook clarity. We identify pronounced 3D warping of the Fermi surface and show that its concomitant nesting acts as the precursor for the exotic 3D charge-density waves in VSe2. Our results demonstrate the immense potential of soft-x-ray ARPES to explore details of 3D electronic structure.

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  • Received 7 June 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.086401

© 2012 American Physical Society

Authors & Affiliations

Vladimir N. Strocov1,*, Ming Shi1, Masaki Kobayashi1, Claude Monney1, Xiaoqiang Wang1, Juraj Krempasky1, Thorsten Schmitt1, Luc Patthey1, Helmuth Berger2, and Peter Blaha3

  • 1Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen-PSI, Switzerland
  • 2Institut de Physique de la Matière Complexe, EPFL, CH-1015 Lausanne, Switzerland
  • 3Institut für Materialchemie, Technische Universität Wien, A-1060 Wien, Austria

  • *Corresponding author. vladimir.strocov@psi.ch.

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Issue

Vol. 109, Iss. 8 — 24 August 2012

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