Journal
PHYSICAL REVIEW LETTERS
Volume 101, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.136804
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Funding
- NSF [CHE- 0117752, DMR-0352738]
- NYSTAR
- ONR [N000140610138]
- FENA MARCO Center
- DOE [DE-AIO2-04ER46133]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0803691] Funding Source: National Science Foundation
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The interaction of electron-hole pairs with lattice vibrations exhibits a wealth of intriguing physical phenomena such as the renowned Kohn anomaly. Here we report the observation in bilayer graphene of an unusual phonon softening that provides the first experimental proof for another type of phonon anomaly. Similar to the Kohn anomaly, which is a logarithmic singularity in the phonon group velocity [W. Kohn, Phys. Rev. Lett. 2, 393 (1959)], the observed phonon anomaly exhibits a logarithmic singularity in the optical-phonon energy. Arising from a resonant electron-phonon coupling effect, the anomaly was also expected, albeit not observed, in monolayer graphene. We propose an explanation for why it is easier to observe in bilayer samples.
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