Abstract
We develop the theory of collective modes supported by a Fermi liquid of electrons in pristine graphene. Under reasonable assumptions regarding the electron-electron interaction, all the modes but the plasmon are overdamped. In addition to the -symmetric spin mode, these include also the valley imbalance modes obeying a symmetry, and a -symmetric valley spin imbalance mode. We derive the interactions and diffusion constants characterizing the overdamped modes. The corresponding relaxation rates set fundamental constraints on graphene valley- and spintronics applications.
- Received 10 November 2020
- Revised 29 January 2021
- Accepted 2 February 2021
DOI:https://doi.org/10.1103/PhysRevB.103.075422
©2021 American Physical Society