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VERSION:2.0
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METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260720T103500Z
UID:https://www.mpsd.mpg.de/events/5737/42300
DTSTART:20160613T133000Z
DTEND:20160613T143000Z
CLASS:PUBLIC
CREATED:20160608T130939Z
DESCRIPTION:TiSe₂ is one of the simplest charge density wave (CDW) materi
 als\, forming a 2×2 superlattice below a transition temperature T_C = 200
  K\, but the origin of this phase is controversial. Its nearly inverted ba
 nd structure led early authors to identify TiSe₂ as an “excitonic insu
 lator\,” which is an electronic instability involving spontaneous prolif
 eration of excitons. The problem is that the CDW also exhibits a sizeable 
 lattice distortion\, leading later authors to identify it as a conventiona
 l Peierls phase. That said\, an excitonic phase would also create an incid
 ental lattice distortion\, since the interaction with phonons can’t be s
 witched off. The arguments on the matter have gone in circles for decades.
 \nVortragende(r): Peter Abbamonte
LAST-MODIFIED:20160608T130939Z
LOCATION:CFEL (Bldg. 99)\, Raum: Seminar Room IV\, O1.111
ORGANIZER;CN=Andrea Cavalleri:mailto:
SUMMARY:MPSD Seminar: Collective modes of the electron-hole condensate in t
 he (putative) excitonic insulator 1T-TiSe₂
URL;VALUE=URI:https://www.mpsd.mpg.de/events/5737/42300
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