Local Flattening of the Fermi Surface and Quantum Oscillations in the Magnetoacoustic Response of a Metal

TL;DR

This paper theoretically investigates how local flattenings of the Fermi surface in metals can amplify quantum oscillations in the magnetoacoustic response, revealing a new geometric influence on electronic properties under strong magnetic fields.

Contribution

It introduces the concept that local Fermi surface flattenings can significantly enhance quantum oscillations in the velocity of acoustic waves in metals.

Findings

Local Fermi surface flattenings amplify quantum oscillations.

Amplification depends on magnetic field orientation.

Enhanced oscillations modulate electron density of states.

Abstract

In the present work we theoretically analyze the effect of the Fermi surface local geometry on quantum oscillations in the velocity of an acoustic wave travelling in metal across a strong magnetic field. We show that local flattenings of the Fermi surface could cause significant amplification of quantum oscillations. This occurs due to enhancement of commensurability oscillations modulating the quantum oscillations in the electron density of states on the Fermi surface. The amplification in the quantum oscillations could be revealed at fitting directions of the magnetic field.