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BEGIN:VEVENT
DTSTAMP:20261019T001446Z
LAST-MODIFIED:20181024T143054Z
DTSTART:20181024T190000Z
DTEND:20181024T200000Z
UID:event2024@bu.edu
URL:http://physics.bu.edu/internal/events/show/2024
SUMMARY:Anomalous metals
DESCRIPTION:Featuring Boris Spivak\, University of Washington\nHosted by: C
	hristopher Laumann\n\nPart of the Condensed Matter Theory Seminar Series.\n
	\nThe observation of metallic ground states in a variety of two-dimensional
	 electronic\nsystems poses a fundamental challenge for the theory of electr
	on fluids. I will analyze\nevidence for the existence of a regime\, which w
	e call the "anomalous metal regime\,"\nin diverse 2D superconducting system
	s driven through a quantum superconductor to\nmetal transition by tuning ph
	ysical parameters such as the magnetic field\,\nthe gate voltage in the cas
	e of systems with a MOSFET geometry\, or the degree of\ndisorder. The princ
	ipal phenomenological observation is that in the anomalous metal\,\nas a fu
	nction of decreasing temperature\, the resistivity first drops as if the sy
	stem were\napproaching a superconducting ground state\, but then saturates 
	at low temperatures to\na value that can be orders of magnitude smaller tha
	n the Drude value. The anomalous\nmetal also shows a giant positive magneto
	-resistance. Thus\, it behaves as if it were a\nfailed superconductor." Thi
	s behavior is observed in a broad range of parameters. I will exhibit\, by 
	theoretical solution of a model of superconducting grains embedded\nin a me
	tallic matrix\, that as a matter of principle such anomalous metallic behav
	ior can\noccur in the neighborhood of a quantum superconductor-metal transi
	tion. However\, I will also argue that the robustness and ubiquitous nature
	 of the observed phenomena are difficult to reconcile with any\nexisting th
	eoretical treatment\, and speculate about the character of a more fundament
	al\ntheoretical framework.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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