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VERSION:2.0
PRODID:icalendar-ruby
CALSCALE:GREGORIAN
X-WR-CALNAME:Magic Angle Bilayer Graphene
X-WR-TIMEZONE:Eastern Time (US & Canada)
BEGIN:VEVENT
DTSTAMP:20260520T163502Z
UID:tag:localist.com\,2008:EventInstance_34908000910179
DTSTART:20201028T173000Z
DTEND:20201028T183000Z
DESCRIPTION:Register Here:\nhttps://harvard.zoom.us/webinar/register/WN_q8r
 I_YJWS2GiLNyxVADNKA\n\nMoiré materials are formed when two-dimensional cr
 ystals are overlaid with a small difference in lattice constant or orienta
 tion.  When the two-dimensional crystals are semimetal or semiconductors\,
  the low energy states of moiré materials are described by periodic conti
 nuum models and have the electronic properties of artificial crystals with
  lattice constants on the tens of nanometer scale\, allowing the number of
  electrons per atom to be varied widely.   My talk will focus on the parti
 cular case of graphene bilayers\, which exhibit a rich set of strongly cor
 related electron states\, including superconductors and orbital magnets\, 
 when twisted close to a magic relative orientation angle at which the elec
 tron velocity at the Fermi level vanishes.     Electronic correlations in 
 Magic Angle Twisted Bilayer Graphene (MAtBG) are strong because the low-en
 ergy moiré superlattice bands are very narrow.  I will discuss efforts\, 
 still very much in progress\, to settle on answers to some of the followin
 g questions.  Does the flat-band dispersion that remains at the magic twis
 t angle play a key role in controlling the phase diagram?  Why are insulat
 ing states at odd integer filling factors not always Chern insulators? Is 
 superconductivity in MAtBG mediated by electron-phonon interactions or by 
 some other mechanism?  What is the pair wavefunction for Cooper pairs in M
 AtBG?
LOCATION:
SUMMARY:Magic Angle Bilayer Graphene
URL;VALUE=URI:https://events.seas.harvard.edu/event/magic_angle_bilayer_gra
 phene
CATEGORIES:Colloquia / Seminar / Lecture
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