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UID:DSC-18362
DTSTART;TZID=Europe/Berlin:20220201T145000
SEQUENCE:1643670445
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20220201T162000
URL:https://dresden-science-calendar.org/calendar/en/detail/18362
LOCATION:TUD\,    
SUMMARY:Abbamonte: Evidence for Pines' Demon in Sr2RuO4 from Momentum-Resol
 ved EELS
CLASS:PUBLIC
DESCRIPTION:Speaker: Peter Abbamonte\nInstitute of Speaker: University of I
 llinois Urbana-Champaign\nTopics:\nPhysik\n Location:\n  Name: TUD ()\n  S
 treet:   \n  City:  \n  Phone: \n  Fax: \nDescription: <![CDATA[<p><strong
 >Abstract:</strong></p>  <p>The characteristic excitation of a metal is it
 s plasmon\, which is a quantized collective oscillation of its electron de
 nsity. In 1965\, David Pines predicted that a distinct type of plasmon\, d
 ubbed a \"demon\"\, could exist in multiband metals containing more than o
 ne species of charge carrier. A demon corresponds to an out-of-phase oscil
 lation of electrons in different bands\, i.e.\, a modulation in the band o
 ccupancy. Demons have proven difficult to detect because they are neutral\
 , meaning they do not couple to light\, and are gapless so their excitatio
 n energy vanishes in the long-wavelength limit. In this talk I will presen
 t evidence for a demon in the multiband metal Sr2RuO4 from momentum-resolv
 ed electron energy-loss spectroscopy (M-EELS). The excitation is formed fr
 om electrons in the beta and gamma bands\, is gapless with a velocity v = 
 0.5 eV·Å\, and exhibits a critical energy of 60 meV. I will discuss ho
 w this excitation violates low-energy sum rules in Sr2RuO4\, which is a de
 fining property of a demon\, as well as its Landau damping into the strong
 ly interacting continuum in this material.</p>  <p><strong>BigBlueButton:<
 /strong></p>  <p>https://selfservice.zih.tu-dresden.de/l/link.php?m=157295
 &amp\;p=94027b15 (https://selfservice.zih.tu-dresden.de/l/link.php?m=15729
 5&amp\;p=94027b15) (TUD)</p>  <p>https://selfservice.zih.tu-dresden.de/lin
 k.php?m=157295&amp\;p=3a7f32d9 (https://selfservice.zih.tu-dresden.de/link
 .php?m=157295&amp\;p=3a7f32d9) (external)</p>
DTSTAMP:20260626T161352Z
CREATED:20220127T231048Z
LAST-MODIFIED:20220131T230725Z
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