SuperStuff

1
SuperStuff Lecture 2 Informal Seminar Series
JC Séamus Davis jcdavis_at_ccmr.cornell.edu
http//people.ccmr.cornell.edu/jcdavis/ Every
Tue., 3.00 PM, AMPEL 311, Fall 2009 Independent
of the microscopic interactions leading to their
formation, supergasses, superfluids,
superconductors and supersolids exhibit the same
macroscopic quantum phenomena including
persistent currents, circulation (or flux)
quantization, quantized vortices, vortex
crystallization, London dynamics and Josephson
Effects. We will review, informally, the
history of these ideas, their experimental
validation, and the present state of research
into such superstuff.
i D. R. Tilley, J. Tilley, Superfluidity and
Superconductivity (IOP Publishing Ltd., UK, ed.
3, 1990).
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Superfluid 4He 3He
4He
3He
4He
2-3He
Bose Einstein Condensation
Cooper Pair Condensation
3
Macroscopic Quantum Phenomena of a Superfluid
Signatures Macroscopic Quantum
State Superflow Circulation
Quantization Quantized Vortices Persistent
Mass Currents Critical Velocity Josephson
Effects
4
Macroscopic Quantum Phenomena of a Superfluid
Signatures Macroscopic Quantum
State Superflow Circulation
Quantization Quantized Vortices Persistent
Mass Currents Critical Velocity Josephson
Effects
5
Torque Measurement of Persistent Currents
John Reppy / Cornell
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Torque Measurement of Persistent Currents
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Torque Measurement of Persistent Currents
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Cool Under Rotation at Angular Speed W
4He
3He
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Persistent Current Gyroscope
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Persistent Current Gyroscope
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Persistent Current Gyroscope
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Persistent Current Gyroscope
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Persistent Current Gyroscope
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Persistent Current Gyroscope
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Persistent Current Gyroscope
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Persistent Superfluid Currents
4He
3He
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Macroscopic Quantum Phenomena of a Superfluid
Signatures Macroscopic Quantum
State Superflow Circulation
Quantization Quantized Vortices Persistent
Mass Currents Critical Velocity Josephson
Effects
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Circulation Quantization in Superfluid 4He 3He
4He
3He
One needs to work at maximum superfluid density
and minimum dissipation T?0
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Circulation Quantization in Superfluid 4He
Joe Vinen / Birmingham
The Detection of Single Quanta of Circulation in
Liquid Helium II W. F. Vinen Source Proceedings
of the Royal Society of London. Series A,
Mathematical and Physical Sciences, Vol. 260, pp
218 (Feb. 21, 1961)
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Ultra-fine Vibrating Wire
B
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Current Pulse
B
I
F
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Current Pulse
B
I
F
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Cool Under Rotation W and then Halt T?0
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Cool Under Rotation W and then Halt T?0
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Magnus Force from Circulating Current
B
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Magnus Force from Circulating Current
B
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Magnus Force from Circulating Current
B
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Superfluid 4He Quantized Circulation
B
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Superfluid 4He Quantized Circulation
The Detection of Single Quanta of Circulation in
Liquid Helium II W. F. Vinen Source Proceedings
of the Royal Society of London. Series A,
Mathematical and Physical Sciences, Vol. 260, pp
218 (Feb. 21, 1961)
30
Circulation Quantization in Superfluid 4He 3He
4He
3He
One needs to work at maximum superfluid density
and minimum dissipation T?0
31
Circulation Quantization in Superfluid 3He
32
(No Transcript)
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SuperStuff Informal Seminar Series JC Séamus
Davis jcdavis_at_ccmr.cornell.edu
http//people.ccmr.cornell.edu/jcdavis/ Every
Tue., 3.00 PM, AMPEL 311, Fall 2009 NEXT
WEEK Phase Slippage