Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 42: Charge Order
TT 42.5: Talk
Tuesday, March 13, 2018, 11:15–11:30, HFT-FT 131
Temperature-dependence of the three-dimensional band structure of 1T-TaS2 — •Sanjoy K. Mahatha1, Arlette S. Ngankeu1, Kevin Guilloy1, Marco Bianchi1, Charlotte E. Sanders1, Kerstin Hanff2, Kai Rossnagel2, Jill A. Miwa1, Christina Breth Nielsen3, Martin Bremholm3, and Philip Hofmann1 — 1Department of Physics and Astronomy, Interdisciplinary Nanoscience Center (iNANO), Aarhus University, 8000 Aarhus C, Denmark — 2Institute for Experimental and Applied Physics, Kiel University, Germany — 3Department of Chemistry, University of Aarhus, Aarhus, Denmark
The 1T polymorph of the layered transition metal dichalcogenide compound TaS2 undergoes a series of temperature-dependent phase transitions consisting of periodic structural distortions and organization of the electrons into regular patterns known as charge density waves (CDW). The different CDW phases vary remarkably in their electronic properties. The commensurate CDW phase of 1T-TaS2 has widely been studied as a quasi-two-dimensional phenomenon that coexists with a Mott insulating state. However, recent theoretical calculations predicted the coexistence of the CDW phase with a nearly one-dimensional metallic dispersion perpendicular to the crystal planes. Our recent angle-resolved photoemission spectroscopy results confirm the existence of a dispersive band which exists for all the different CDW phases at different temperatures. Here, we will give a detailed account of the three dimensional band structure of this highly correlated material.