Direct Measurement of Quantum Phase Gradients in Superfluid He4 Flow

Yuki Sato, Aditya Joshi, and Richard Packard
Phys. Rev. Lett. 98, 195302 – Published 9 May 2007

Abstract

We report a new kind of experiment in which we generate a known superfluid velocity in a straight tube and directly determine the phase difference across the tube’s ends using a superfluid matter wave interferometer. By so doing, we quantitatively verify the relation between the superfluid velocity and the phase gradient of the condensate macroscopic wave function. Within the systematic error of the measurement (10%) we find νs=/m4ϕ.

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  • Received 28 February 2007

DOI:https://doi.org/10.1103/PhysRevLett.98.195302

©2007 American Physical Society

Authors & Affiliations

Yuki Sato, Aditya Joshi, and Richard Packard

  • Physics Department, University of California, Berkeley, California 94720, USA

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Issue

Vol. 98, Iss. 19 — 11 May 2007

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