Direct measurement of quantum phase gradients in superfluid 4He flow
Superconductivity
2009-11-13 v1
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 v_s=(hbar/m_4)*(grad phi).
Keywords
Cite
@article{arxiv.0704.2082,
title = {Direct measurement of quantum phase gradients in superfluid 4He flow},
author = {Yuki Sato and Aditya Joshi and Richard Packard},
journal= {arXiv preprint arXiv:0704.2082},
year = {2009}
}