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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-1886
DTSTART:20101014T150000Z
DURATION:PT1H0M0S
DTSTAMP:20240328T170800Z
LAST-MODIFIED:20101008T182148Z
LOCATION:5310 Chamberlin
SUMMARY:Quantum Fluids in Random Media: Effects of Disorder on the Pha
ses of 3He\, R. G. Herb Condensed Matter Seminar\, James A.
Sauls\, Northwestern University
DESCRIPTION:The light isotope of Helium - 3He - is the pure
st phase of matter in nature. Zero-point fluctuations drive any impuri
ty out of the bulk liquid. However\, helium can be impregnated into po
rous glass. Silica aerogel is a solid formed from a network of
strands and clusters of SiO2 that is almost entirely empty
space. The system of quantum liquid infused into silica aerogel provid
es an novel system for studying the effects of disorder on the relativ
e stability of ordered phases near a quantum critical point. I will de
scribe some of the key experiments\, and related theoretical interpret
ations\, that have been carried which elucidate the role of disorder o
n the properties of both normal and superfluid 3He. These s
tudies may also provide deeper insight into porous media with complex
structure. The gossamer structure of silica aerogel is a realization o
f a random fractal - a solid with no long-range order\, but power-law
scaling of the density correlation function. I will also discuss possi
bilities for observing the effects of fractal correlations in the diso
rdered medium on the properties of liquid 3He.
URL:https://www.physics.wisc.edu/events/?id=1886
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