# Phonon-drag magnetoquantum oscillations in graphene

## TL;DR

This paper develops a theoretical model for phonon-drag magnetothermopower in graphene under magnetic fields, predicting quantum oscillations and large thermopower values, with comparisons to experimental data.

## Contribution

It introduces a novel theory for phonon-drag thermopower in graphene in quantizing magnetic fields, highlighting quantum oscillations and temperature dependence.

## Key findings

- Quantum oscillations of $S_{xx}^g$ as a function of magnetic field and electron density.
- Amplitude of oscillations varies with magnetic field and electron density.
- Predicted large thermopower values of a few hundred microvolts per Kelvin.

## Abstract

A theory of low-temperature phonon-drag magnetothermopower $S_{xx}^g$ is presented in graphene in a quantizing magnetic field. $S_{xx}^g$ is found to exhibit quantum oscillations as a function of magnetic field $B$ and electron concentration $n_e$. Amplitude of the oscillations is found to increase (decrease) with increasing $B$ ($n_e$). The behavior of $S_{xx}^g$ is also investigated as a function of temperature. A large value of $S_{xx}^g $($\sim$ few hundreds of $\mu $V/K) is predicted. Numerical values of $S_{xx}^g $ are compared with the measured magnetothermopower $S_{xx}$ and the diffusion component $S_{xx}^d$ from the modified Girvin-Jonson theory.