Negative plasmon dispersion in the transition-metal dichalcogenide 2H-TaSe2

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.


Published in:
Physical Review B, 79, -
Year:
2009
Keywords:
Laboratories:




 Record created 2010-11-30, last modified 2018-03-17


Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)