Drift-induced modifications to the dynamical polarization of graphene
Mohsen Sabbaghi, Hyun-Woo Lee, Tobias Stauber, Kwang Soo Kim
TL;DR
This paper investigates how a steady current affects the dynamical polarization and plasmonic excitations in graphene, revealing drift-induced modifications and a plasmon gain region linked to interband transitions.
Contribution
It provides analytical and numerical analysis of drift effects on graphene's response function, highlighting novel plasmonic phenomena under current flow.
Findings
Analytic expressions for small drift velocities at finite chemical potential.
Identification of a plasmon gain region at zero chemical potential.
Numerical results showing drift-induced modifications to plasmon dispersion.
Abstract
The response function of graphene is calculated in the presence of a constant current across the sample. For small drift velocities and finite chemical potential, analytic expressions are obtained and consequences on the plasmonic excitations are discussed. For general drift velocities and zero chemical potential, numerical results are presented and a plasmon gain region is identified which is related to interband transitions.
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