### 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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#### Authors:

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.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2009.DFD.ET.3