Effect of charge order on the plasmon dispersion in transition-metal dichalcogenides
- Wezel, Jasper van Materials Science Division, Argonne National Laboratory, Illinois, USA
- Schuster, Roman IFW Dresden, Dresden, Germany - Department of Physics, University of Fribourg, Switzerland
- König, Andreas IFW Dresden, Dresden, Germany
- Knupfer, Martin IFW Dresden, Dresden, Germany
- Brink, Jeroen van den IFW Dresden, Dresden, Germany
- Berger, Helmuth Institut de Physique de la Matière Complexe, EPFL, Lausanne, Switzerland
- Büchner, Bernd IFW Dresden, Dresden, Germany
-
18.10.2011
Published in:
- Physical Review Letters. - 2011, vol. 107, no. 17, p. 176404
English
We investigate the dispersion of the charge carrier plasmon in the three prototypical charge-density wave bearing transition-metal dichalcogenides 2H-TaSe₂, 2H-TaS₂, and 2H-NbSe₂ employing electron energy-loss spectroscopy. For all three compounds the plasmon dispersion is found to be negative for small momentum transfers. This is in contrast with the generic behavior observed in simple metals as well as the related system 2H-NbS₂, which does not exhibit charge order. We present a semiclassical Ginzburg-Landau model which accounts for these observations, and argue that the vicinity to a charge ordered state is thus reflected in the properties of the collective excitations.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Physique
- Language
-
- English
- Classification
- Physics
- License
- License undefined
- Identifiers
-
- RERO DOC 28310
- DOI 10.1103/PhysRevLett.107.176404
- Persistent URL
- https://folia.unifr.ch/unifr/documents/302127
Statistics
Document views: 19
File downloads:
- sch_ecp.pdf: 30