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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-8393
DTSTART:20231102T150000Z
DTEND:20231102T230000Z
DTSTAMP:20260414T044420Z
LAST-MODIFIED:20231101T162140Z
LOCATION:5310 Chamberlin
SUMMARY:Theory of Pines' demon in multiband metals\, R. G. Herb Conden
 sed Matter Seminar\, Edwin Huang\, Notre Dame
DESCRIPTION:In 1956\, David Pines predicted the existence of an acoust
 ic plasmon\, dubbed a "demon"\, in metals with multiple and sufficient
 ly distinct charge carrier species. Despite extensive searches\, demon
 s have not been observed directly until recent momentum-resolved elect
 ron energy-loss spectroscopy (M-EELS) experiments on Sr2RuO4. Here\, w
 e discuss the theoretical conditions for the existence of demons as a 
 stable collective excitation in multiband metals. We find\, without an
 y fitting or tuning of parameters\, agreement between experimental M-E
 ELS spectra and multi-orbital random phase approximation (RPA) calcula
 tions of the charge susceptibility. A decomposition of the calculation
  of the susceptibility into intra- and inter-band components provides 
 direct evidence of the out-of-phase character of the demon. Our findin
 gs thus demonstrate the utility of numerical calculations for the micr
 oscopic interpretation of experimental spectroscopy.
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\nNature 621\,
  66–70 (2023)
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URL:https://www.physics.wisc.edu/events/?id=8393
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