Acoustic Cyclotron Resonance and Giant High Frequency Magnetoacoustic Oscillations in Metals with Locally Flattened Fermi Surface

TL;DR

This paper investigates how local flattening of the Fermi surface in metals amplifies acoustic cyclotron resonance and high-frequency magnetoacoustic oscillations, revealing unique coupling effects with ultrasonic waves.

Contribution

It introduces the impact of local Fermi surface flattening on geometric oscillations and cyclotron resonance in metals, highlighting significant enhancement effects.

Findings

Local FS flattening enhances cyclotron resonance

Significant increase in geometric oscillations observed

Coupling of ultrasound with shortwave cyclotron waves analyzed

Abstract

We consider the effect of local flattening on the Fermi surface (FS) of a metal upon geometric oscillations of the velocity and attenuation of ultrasonic waves in the neighborhood of the acoustic cyclotron resonance. It is shown that such peculiarities of the local geometry of the FS can lead to a significant enhancement of both cyclotron resonance and geometric oscillations. Characteristic features of the coupling of ultrasound to shortwave cyclotron waves arising due to the local flattening of the FS are analyzed. PACS numbers 71.18.+y; 72.15.Gd; 72.15.-v