Periodic orbit resonances in layered metals in tilted magnetic fields

TL;DR

This paper investigates how the interlayer conductivity of layered metals exhibits harmonic resonances when subjected to tilted magnetic fields, revealing insights into electron dynamics without requiring a three-dimensional Fermi surface.

Contribution

It demonstrates the occurrence of harmonic resonances in layered metals' interlayer conductivity under tilted magnetic fields, applicable to both coherent and incoherent transport regimes.

Findings

Resonances occur at harmonics of electron oscillation frequencies.

Resonance intensity varies with magnetic field direction.

Resonances do not require a 3D Fermi surface.

Abstract

The frequency dependence of the interlayer conductivity of a layered Fermi liquid in a magnetic field which is tilted away from the normal to the layers is considered. For both quasi-one- and quasi-two-dimensional systems resonances occur when the frequency is a harmonic of the frequency at which the magnetic field causes the electrons to oscillate on the Fermi surface within the layers. The intensity of the different harmonic resonances varies significantly with the direction of the field. The resonances occur for both coherent and weakly incoherent interlayer transport and so their observation does not imply the existence of a three-dimensional Fermi surface.