Fine structure in high-resolution photoemission spectra of quasi-two-dimensional <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mn>1</mn><mi>T</mi><mo>−</mo><mrow><msub><mrow><mi mathvariant="normal">TaS</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span>

Th. Pillo; J. Hayoz; D. Naumović; H. Berger; L. Perfetti; L. Gavioli; A. Taleb-Ibrahimi; L. Schlapbach; P. Aebi

doi:10.1103/PhysRevB.64.245105

Fine structure in high-resolution photoemission spectra of quasi-two-dimensional $1 T - {TaS}_{2}$

Th. Pillo, J. Hayoz, D. Naumović, H. Berger, L. Perfetti, L. Gavioli, A. Taleb-Ibrahimi, L. Schlapbach, and P. Aebi

Phys. Rev. B 64, 245105 – Published 3 December 2001

Abstract

Using high-resolution angle-resolved photoemission spectroscopy (ARPES), we examined the charge density wave (CDW) compound $1 T - {TaS}_{2}$ as a function of the photon energy (energy range from 11 up to 33 eV) for both quasicommensurate (QC) and commensurate (C) CDW phases. While the QC-phase normal emission ARPES spectra coincide with previous results, normal emission spectra of the C phase reveal evidence for a fine structure in the CDW-induced features between 1 eV binding energy and the Fermi level. This fine structure may be explained by the subband manifold of the Ta $5 d$ band, split off due to the CDW-induced $\sqrt{13} \times \sqrt{13}$ superstructure.

Received 28 June 2001

DOI:https://doi.org/10.1103/PhysRevB.64.245105

Authors & Affiliations

Th. Pillo^1,*, J. Hayoz¹, D. Naumović¹, H. Berger², L. Perfetti², L. Gavioli^2,3, A. Taleb-Ibrahimi³, L. Schlapbach¹, and P. Aebi¹

¹Institut de Physique, Université de Fribourg, CH-1700 Fribourg, Switzerland
²Institut de Physique Appliquée, EPF, CH-1015 Lausanne, Switzerland
³LURE, Centre Universitaire de Paris-Sud, F-91898 Orsay, France

^*Corresponding author. Present address: Institut de Physique, Université de Neuchâtel, CH-2000 Neuchâtel, Switzerland. Electronic address: thorsten.pillo@unine.ch

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Vol. 64, Iss. 24 — 15 December 2001

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