Phase-Coherent Drag of Plasmons in a 2D Flowing Fermi Liquid

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.

Name thesis:degree_name

Bachelor

Department dc:contributor.department

Massachusetts Institute of Technology. Department of Physics

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2021

Author dc:creator

• Gao, Haoyang

Advisor dc:contributor.advisor

• Levitov, Leonid S.

Statement dc:rights

• In Copyright - Educational Use Permitted
• Copyright retained by author(s)

Licence dc:rights.uri

• https://rightsstatements.org/page/InC-EDU/1.0/

Handle dc:identifier.uri

https://hdl.handle.net/1721.1/139372

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/139372