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Effects of electron-electron interactions on the electronic Raman scattering of graphite in high magnetic fields

Accepted version
Peer-reviewed

Type

Article

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Authors

Ma, Y 
Kim, Y 
Kalugin, NG 
Ferrari, AC 

Abstract

We report the observation of strongly temperature-dependent, asymmetric spectral lines in electronic Raman scattering spectra of graphite in a high magnetic field up to 45 T applied along the c-axis. The magnetic field quantizes the in-plane motion, while the out-of-plane motion remains free, effectively reducing the system dimension from three to one. Optically created electron-hole pairs interact with, or shake up, the one-dimensional Fermi sea in the lowest Landau subbands. Based on the Tomonaga-Luttinger liquid theory, we show that interaction effects modify the van Hove singularity to the form (ωΔ)2α−1/2 at zero temperature. At finite temperature, we predict a thermal broadening factor that increases linearly with the temperature. Our model reproduces the observed temperature-dependent line-shape, determining α to be $\sim$0.05 at 40 T.

Description

Keywords

cond-mat.mes-hall, cond-mat.mes-hall

Journal Title

Physical Review B - Condensed Matter and Materials Physics

Conference Name

Journal ISSN

1098-0121
1550-235X

Volume Title

89

Publisher

American Physical Society (APS)
Sponsorship
Engineering and Physical Sciences Research Council (EP/K01711X/1)
Engineering and Physical Sciences Research Council (EP/K017144/1)
European Commission (604391)