Session ET: Vortex Dynamics and Vortex Flows III

4:15 PM–6:25 PM, Sunday, November 22, 2009
Room: 200H

Chair: Stefan Llewellyn Smith, University of California, San Diego

Abstract ID: BAPS.2009.DFD.ET.3

Abstract: ET.00003 : Dynamics of the Lattice Array Formation in Superfluid Helium

4:41 PM–4:54 PM

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  Kristina Gaff
    (University of Maryland, College Park)

  Enrico Fonda
    (Universit\'a di Trieste; University of Maryland at College Park)

  Matthew Paoletti
    (University of Maryland, College Park)

  Daniel Lathrop
    (University of Maryland, College Park)

  Katepalli Sreenivasan
    (International Centre for Theoretical Physics; University of Maryland at College Park)

In 1955, Feynman theorized that the lowest energy state of rotating superfluid helium would result in a lattice structure of quantized vortices. In 1979, Yarmchuk \textit{et. al.} observed a small lattice array of up to eleven vortices using clusters of ions, and later experiments observed the lattice array in superfluid $^{4}$He perpendicular to the axis of rotation using hydrogen ice particles (Bewley \textit{et. al.} 2006). Yet, the formation and dynamics of these arrays remain otherwise unexplored experimentally. Now, by visualizing sub-micron particles trapped on quantized vortices, we characterize the lattice array formation in superfluid helium. Our study investigates the lattice formation by independently varying rotation rate and temperature.

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