Negative plasmon dispersion in the transition-metal dichalcogenide 2H-TaSe2
2009
Abstract
We report about an electron energy-loss study on the dispersion of the charge-carrier plasmon in the charge-density-wave system 2H-TaSe2 above and below the metal-insulator transition. In both cases we find a negative slope, which is in remarkable contrast to the traditional prediction for metals based on the random-phase approximation. Possible scenarios for this intriguing phenomenon are discussed.
Details
Title
Negative plasmon dispersion in the transition-metal dichalcogenide 2H-TaSe2
Author(s)
Schuster, R. ; Kraus, R. ; Knupfer, M. ; Berger, H. ; Buechner, B.
Published in
Physical Review B
Volume
79
Issue
4
Pages
045134
Date
2009
Keywords
charge density waves; electron energy loss spectra; metal-insulator transition; plasmons; tantalum compounds; Charge-Density-Wave; Electron-Energy Loss; Tetracyanoquinodimethane Ttf-Tcnq; Dependent Exchange Correction; One-Component Plasma; Local-Field Factor; Alkali-Metals; Dielectric Function; Neutron-Scattering; Peierls Transition
Other identifier(s)
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Laboratories
SB
Record Appears in
Scientific production and competences > Unattributed publications > SB - SB - Unattributed publications
Scientific production and competences > SB - School of Basic Sciences > SB - Unattributed publications
Peer-reviewed publications
Work produced at EPFL
Journal Articles
Published
Scientific production and competences > SB - School of Basic Sciences > SB - Unattributed publications
Peer-reviewed publications
Work produced at EPFL
Journal Articles
Published
Record creation date
2010-11-30