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BEGIN:VEVENT
DTSTAMP:20260525T130231Z
DTSTART;VALUE=DATE-TIME:20240214T163000
DTEND;VALUE=DATE-TIME:20240214T173000
SUMMARY:Guy Trambly de Laissardière (Cergy Paris Université\, France): "E
 lectronic and magnetic properties magic angle twisted bilayer graphene a
 nd MoS2 "
TZID:Europe/London
UID:20240214-8a1785d78ce92907018ce9546ed70100@warwick.ac.uk
CREATED:20240108T134753Z
DESCRIPTION:The Moiré pattern of the magic-angle twisted bilayers graphen
 e and twisted bilayer MoS2 leads to localization of the low energy elect
 rons in the AA-stacking regions\, reflected by very flat bands. This str
 ong reduction of the kinetic energy enhances the importance of interacti
 ons and thus renders the bilayer systems much more susceptible to correl
 ation effects\, as show experimentally by the discovery of correlated in
 sulators and superconductivity. Despite numerous theoretical and experim
 ental studies\, the understanding of this new electronic localization is
  still incomplete. The rotation angle is of course a key parameter\, but
  it has also been shown that slight expansion or contraction of one laye
 r relative to the other (“heterostrain”) can strongly modify the flat ba
 nds. We will present theoretical study of the electronic structure and q
 uantum transport properties of electronic flat bands\, considering as we
 ll as possible the structural parameters that condition them (rotation a
 ngle\, bias voltage\, heterostrain\, local defects or atomic relaxation)
 . We also investigate the magnetic instabilities in twisted bilayer grap
 hene using a real-space Hartree-Fock mean-field theories. Starting from 
 a tight-binding description of the non-interacting bilayer systems we ad
 d a local Coulomb interaction U in order to model the Coulomb repulsion 
 between electron. At half filling\, localized magnetic states emerge for
  U values well below those required to render an insulated layer antifer
 romagnetic.
LOCATION:PLT
URL:
ATTACH:
CATEGORIES:Departmental Colloquium
LAST-MODIFIED:20240108T134753Z
ORGANIZER;CN=Valery Nakariakov:
END:VEVENT
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