Journal
PHYSICAL REVIEW B
Volume 89, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.89.121402
Keywords
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Funding
- NHMFL [UCGP-5068]
- DOE/BES [DE-FG02-07ER46451]
- NSF [DMR-1006663]
- DOE BES Program [DE-FG02-06ER46308]
- Robert A. Welch Foundation [C-1509]
- Royal Society Wolfson Research Merit Award
- European Research Council
- EU [604391]
- EPSRC [EP/K01711X/1, EP/K017144/1]
- Nokia Research Centre, Cambridge
- EPSRC [EP/K017144/1, EP/K01711X/1] Funding Source: UKRI
- U.S. Department of Energy (DOE) [DE-FG02-06ER46308] Funding Source: U.S. Department of Energy (DOE)
- Engineering and Physical Sciences Research Council [EP/K017144/1, EP/K01711X/1] Funding Source: researchfish
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We report the observation of strongly temperature (T)-dependent 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 3 to 1. 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 spectral line shape from (omega - Delta)(-1/2) to (omega - Delta)(2 alpha-1/2) at T = 0. At finite T, we predict a thermal broadening factor that increases linearly with T. Our model reproduces the observed T -dependent line shape, determining the electron-electron interaction parameter alpha to be similar to 0.05 at 40 T.
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