Phase-Coherent Drag of Plasmons in a 2D Flowing Fermi Liquid
Name
gao-haoyangg-SB-physics-2021-thesis.pdf
Description
Thesis PDF
Size
467.37 KB
Format
Adobe PDF
Checksum (MD5)
4d5a02522ba911de5e03d5fd701a3290
Author(s)
Gao, Haoyang
Advisor(s)
Levitov, Leonid S.
Date Issued
June 2021
Publisher
Massachusetts Institute of Technology
Abstract
Collective modes in electron fluids feature phase-coherent drag response under a background carrier flow, resembling the optical Fizeau drag of photons by a moving medium. Time reversal breaking due to Fermi surface polarization by the flow results in nonreciprocity: collective modes acquire a ±𝑘 asymmetry in mode dispersion. This thesis explores plasmonic drag in two-dimensional electron fluids with a full account given to the Fermi-liquid interactions. These interactions are essential when the electron band is nonparabolic, as in graphene, giving rise to subtle “motional” Fermi-liquid effects which describe the flow-induced change in the quasiparticle velocities and interactions. These new Fermi-liquid effects can be represented as the flow-dependent interactions between quasiparticles on the Fermi surface deformed by the flow, in general not reducible to the standard Fermi-liquid parameters. A model of graphene Fermi-liquid predicts a substantial enhancement in the plasmon frequency shift, pointing to an opportunity to directly probe the motional Fermi-liquid effects in plasmonic near-field imaging experiments.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
In Copyright - Educational Use Permitted
Copyright retained by author(s)
Persistent DSpace Link
