Phase separation in the vicinity of Fermi surface hot spots

Jaouen, Thomas; Hildebrand, Baptiste; Mottas, Marie-Laure; Giovannantonio, M. Di; Ruffieux, Pascal; Rumo, Maxime; Nicholson, Christopher W.; Razzoli, Elia; Barreteau, C.; Ubaldini, A.; Giannini, E.; Vanini, Fabiano; Beck, Hans; Monney, Claude; Aebi, Philipp

doi:10.1103/PhysRevB.100.075152

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Journal article

Phase separation in the vicinity of Fermi surface hot spots

Jaouen, Thomas Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, Switzerland
Hildebrand, Baptiste Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, Switzerland
Mottas, Marie-Laure Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, Switzerland
Giovannantonio, M. Di Empa, Swiss Federal Laboratories for Materials Science and Technology, nanotech@surfaces Laboratory, Dübendorf, Switzerland
Ruffieux, Pascal Empa, Swiss Federal Laboratories for Materials Science and Technology, nanotech@surfaces Laboratory, Dübendorf, Switzerland
Rumo, Maxime Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, Switzerland
Nicholson, Christopher W. Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, Switzerland
Razzoli, Elia Quantum Matter Institute, University of British Columbia, Vancouver, Canada - Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada
Barreteau, C. Department of Quantum Matter Physics, University of Geneva, Switzerland
Ubaldini, A. Department of Quantum Matter Physics, University of Geneva, Switzerland
Giannini, E. Department of Quantum Matter Physics, University of Geneva, Switzerland
Vanini, Fabiano Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, Switzerland
Beck, Hans Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, Switzerland
Monney, Claude Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, Switzerland
Aebi, Philipp Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, Switzerland

28.08.2019

Published in:

Physical Review B. - 2019, vol. 100, no. 7, p. 075152

English Spatially inhomogeneous electronic states are expected to be key ingredients for the emergence of superconducting phases in quantum materials hosting charge-density waves (CDWs). Prototypical materials are transitionmetal dichalcogenides (TMDCs) and among them, 1T-TiSe2 exhibiting intertwined CDW and superconducting states under Cu intercalation, pressure, or electrical gating. Although it has been recently proposed that the emergence of superconductivity relates to CDW fluctuations and the development of spatial inhomogeneities in the CDW order, the fundamental mechanism underlying such a phase separation (PS) is still missing. Using angle- resolved photoemission spectroscopy and variable-temperature scanning tunneling microscopy, we report on the phase diagram of the CDW in 1T-TiSe2 as a function of Ti self-doping, an overlooked degree of freedom inducing CDW texturing. We find an intrinsic tendency towards electronic PS in the vicinity of Fermi surface (FS) “hot spots,” i.e., locations with band crossigs close to, but not at the Fermi level.We therefore demonstrate an intimate relationship between the FS topology and the emergence of spatially textured electronic phases which is expected to be generalizable to many doped CDW compounds

Faculty

Faculté des sciences et de médecine

Department

Département de Physique

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