Magneto-Acoustic Spectroscopy in Superfluid 3He-B

TL;DR

This paper employs magneto-acoustic spectroscopy and acoustic cavity interferometry to measure Zeeman energies in superfluid 3He-B, revealing insights into f-wave interactions through the acoustic Faraday effect.

Contribution

It introduces a high-resolution spectroscopic method using the acoustic Faraday effect to study excited states in superfluid 3He-B, linking experimental results with theoretical models.

Findings

Measured Zeeman energies of excited states in superfluid 3He-B.

Determined the Lande g-factor from polarization rotation data.

Estimated f-wave interaction strength using theoretical analysis.

Abstract

We have used the recently discovered acoustic Faraday effect in superfluid 3He to perform high resolution spectroscopy of an excited state of the superfluid condensate. With acoustic cavity interferometry we measure the rotation of the plane of polarization of a transverse sound wave propagating in the direction of magnetic field from which we determine the Zeeman energy of the excited state. We interpret the Lande g-factor, combined with the zero-field energies of the state, using the theory of Sauls and Serene to calculate the strength of f -wave interactions in 3He.