Display options
Cite
Yan J, Henriksen EA, Kim P, et al. Observation of anomalous phonon softening in bilayer graphene. Phys Rev Lett. 2008;101(13):136804doi: 10.1103/PhysRevLett.101.136804.
Yan, J., Henriksen, E. A., Kim, P., & Pinczuk, A. (2008). Observation of anomalous phonon softening in bilayer graphene. Physical review letters, 101(13), 136804. https://doi.org/10.1103/PhysRevLett.101.136804
Yan, Jun, et al. "Observation of anomalous phonon softening in bilayer graphene." Physical review letters vol. 101,13 (2008): 136804. doi: https://doi.org/10.1103/PhysRevLett.101.136804
Yan J, Henriksen EA, Kim P, Pinczuk A. Observation of anomalous phonon softening in bilayer graphene. Phys Rev Lett. 2008 Sep 26;101(13):136804. doi: 10.1103/PhysRevLett.101.136804. Epub 2008 Sep 25. PMID: 18851480.
Copy Download .nbib Format: NLM
Share it on

Phys Rev Lett. 2008 Sep 26;101(13):136804. doi: 10.1103/PhysRevLett.101.136804. Epub 2008 Sep 25.

Observation of anomalous phonon softening in bilayer graphene.

Physical review letters

Jun Yan, Erik A Henriksen, Philip Kim, Aron Pinczuk

Affiliations

  1. Department of Physics, Columbia University, New York, New York 10027, USA. [email protected]

PMID: 18851480 DOI: 10.1103/PhysRevLett.101.136804

Abstract

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.

Publication Types