In-plane optical phonon modes of current-carrying graphene
Mohsen Sabbaghi,
Tobias Stauber,
Hyun-Woo Lee
et al.
Abstract:In this work, we study the in-plane optical phonon modes of current-carrying single-layer graphene whose coupling to the π electron gas is strong. Such modes are expected to undergo a frequency shift compared to the non-current-carrying state due to the non-equilibrium occupation of the Dirac cone electronic eigen-states with the flowing π electron gas. Large electron-phonon coupling (EPC) can be identified by an abrupt change in the slope of the phonon mode dispersion known as the Kohn anomaly, which mainly o… Show more
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