Coexistence of gapless excitations and commensurate charge-density wave in the 2H transition metal dichalcogenides

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Title: Coexistence of gapless excitations and commensurate charge-density wave in the 2H transition metal dichalcogenides
Authors: Barnett, RL
Polkovnikov, A
Demler, E
Yin, WG
Ku, W
Item Type: Journal Article
Abstract: An unexpected feature common to 2H transition metal dichalcogenides (2H TMDs) is revealed with a first-principles Wannier function analysis of the electronic structure of the prototype 2H TaSe2: The low-energy Ta “5dz2” bands governing the physics of a charge-density wave (CDW) is dominated by hopping between next-nearest neighbors. With this motivation we develop a minimal effective model for the CDW formation, in which the unusual form of the hopping leads to an approximate decoupling of the three sublattices. In the CDW phase one sublattice remains undistorted, leaving the bands associated with it ungapped everywhere in the Fermi surface, resolving the long-standing puzzle of the coexistence of gapless excitations and commensurate CDW in the 2H TMDs.
Issue Date: 20-Jan-2006
Date of Acceptance: 1-Jan-2006
URI: http://hdl.handle.net/10044/1/55409
DOI: https://dx.doi.org/10.1103/PhysRevLett.96.026406
ISSN: 0031-9007
Publisher: American Physical Society
Journal / Book Title: Physical Review Letters
Volume: 96
Issue: 2
Copyright Statement: © 2006 American Physical Society
Keywords: Science & Technology
Physical Sciences
Physics, Multidisciplinary
Physics
FERMI-SURFACE
2H-TASE2
MECHANISM
2H-NBSE2
CHALCOGENIDES
cond-mat.str-el
cond-mat.supr-con
02 Physical Sciences
General Physics
Publication Status: Published
Article Number: 026406
Appears in Collections:Mathematics
Applied Mathematics and Mathematical Physics
Faculty of Natural Sciences



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