Evolution of the charge carrier plasmon in the one-dimensional metal TTF-TCNQ as a function of temperature and momentum. (11th September 2019)

• Record Type: Journal Article
• Authors: Kovbasa, Nikolay; Graf, Lukas; Knupfer, Martin
• Is Part Of: Materials research express. Volume 6:Number 10(2019)
• Publication Date: 2019-09-11
• Subjects: plasmon dispersion -- low-dimensional metals -- EELS; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/ab3f9d
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: We have investigated the charge carrier plasmon in the quasi one-dimensional metal TTF-TCNQ using electron energy-loss spectroscopy. Our data reveal a negative plasmon dispersion with a slope that is independent of temperature, which is in agreement to predictions from model calculations and previous room temperature data. A plasmon energy shift upon temperature is observed, and we discuss possible contributions to this shift. The spectral width of the plasmon is rather temperature independent, but increases clearly above a momentum value of about 0.3 Å −1 .