BEGIN:VCALENDAR
VERSION:2.0
PRODID:icalendar-ruby
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VTIMEZONE
TZID:Europe/Vienna
BEGIN:DAYLIGHT
DTSTART:20200329T030000
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3
TZNAME:CEST
END:DAYLIGHT
BEGIN:STANDARD
DTSTART:20191027T020000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
TZNAME:CET
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTAMP:20260405T215707Z
UID:5ddfd3c46ea3a139621520@ist.ac.at
DTSTART:20200214T110000
DTEND:20200214T120000
DESCRIPTION:Speaker: Dmitri Efetov\nhosted by Zhanybek Alpichshev\nAbstract
 : When twisted close to a magic relative orientation angle near 1 degree\,
  bilayer graphene has flat moire superlattice minibands that have emerged 
 as a rich and highly tunable source of strong correlation physics\, notabl
 y the appearance of superconductivity close to interaction-induced insulat
 ing states. Here we report on the fabrication of bilayer graphene devices 
 with exceptionally uniform twist angles. We show that the reduction in twi
 st angle disorder reveals insulating states at all integer occupancies of 
 the four-fold spin/valley degenerate flat conduction and valence bands\, i
 .e. at moire band filling factors nu = 0\, +(-) 1\, +(-) 2\, +(-) 3\, and 
 reveals new superconductivity regions below critical temperatures as high 
 as 3 K close to - 2 filling. In addition we find novel orbital magnetic st
 ates with non-zero Chern numbers. Our study shows that symmetry-broken sta
 tes\, interaction driven insulators\, and superconducting domes are common
  across the entire moire flat bands\, including near charge neutrality. We
  further will discuss recent experiments including screened interactions\,
  fragile topology and the first applications of this amazing new materials
  platform.
LOCATION:Heinzel Seminar Room / Office Bldg West (I21.EG.101)\, ISTA
ORGANIZER:swiddman@ist.ac.at
SUMMARY:Dmitri Efetov: Magic Angle Bilayer Graphene - Superconductors\, Orb
 ital Magnets\, Correlated States and beyond
URL:https://talks-calendar.ista.ac.at/events/2430
END:VEVENT
END:VCALENDAR