Direct measurement of quantum phase gradients in superfluid 4He flow

Details Direct measurement of quantum phase gradients in superfluid 4He flow Direct measurement of quantum phase gradients in superfluid 4He flow

2007-04-17

arxiv.org/abs/0704.2082v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevLett.98.195302

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).

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