Modelling the angle-dependent magnetoresistance oscillations of Fermi surfaces with hexagonal symmetry

TL;DR

This paper theoretically investigates how angle-dependent magnetoresistance oscillations in hexagonal quasi-two-dimensional systems reveal Fermi surface topology, considering effects of interplane warping and isotropic scattering.

Contribution

It provides a theoretical framework for understanding and predicting angle-dependent magnetotransport signatures in hexagonal layered materials.

Findings

Angular oscillations follow lattice symmetry for in-plane rotation.

Inter-plane rotation features depend on the degree of Fermi surface warping.

Predictions made for specific signatures in materials like PdCoO2 and PtCoO2.

Abstract

By solving the Boltzmann transport equation we investigate theoretically the general form of oscillations in the resistivity caused by varying the direction of an applied magnetic field for the case of quasi-two dimensional systems on hexagonal lattices. The presence of the angular magnetoresistance oscillations can be used to map out the topology of the Fermi surface and we study how this effect varies as a function of the degree of interplane warping as well as a function of the degree of isotropic scattering. We find that the angular dependent effect due to in-plane rotation follows the symmetry imposed by the lattice whereas for inter-plane rotation the degree of warping dictates the dominant features observed in simulations. Our calculations make predictions for specific angle-dependent magnetotransport signatures in magnetic fields expected for quasi-two dimensional hexagonal compounds similar to PdCoO2 and PtCoO2.