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UID:news566@physik.unibas.ch
DTSTAMP;TZID=Europe/Zurich:20220727T110001
DTSTART;TZID=Europe/Zurich:20220728T130000
SUMMARY:Phenomenological theory of correlated insulators and superconductiv
 ity in twisted bilayer graphene
DESCRIPTION:Abstract: We introduce and analyze a model that sheds light on 
 the interplay between correlated insulating states\, superconductivity\, a
 nd flavor-symmetry breaking in magic-angle twisted bilayer graphene. Using
  a variational mean-field theory\, we determine the normal-state phase dia
 gram of our model as a function of the band filling. The phase diagram inc
 ludes robust insulators at even integer fillings\, occasional weaker insul
 ators at odd integer fillings\, and a pattern of flavor-symmetry breaking 
 at non-integer fillings. Adding a phonon-mediated inter-valley retarded at
 tractive interaction\, we obtain strong-coupling superconducting domes\, w
 hose structure is in qualitative agreement with experiments. Our model elu
 cidates how the intricate form of the interactions and the particle-hole a
 symmetry of the electronic spectrum determine the phase diagram. It also e
 xplains how subtle differences between devices may lead to experimentally 
 observing different behaviors. A similar model with minor modifications is
  suitable for describing other systems\, such as untwisted and twisted tri
 layer Graphene.
X-ALT-DESC:<p><strong>Abstract:</strong> We introduce and analyze a model t
 hat sheds light on the interplay between correlated insulating states\, su
 perconductivity\, and flavor-symmetry breaking in magic-angle twisted bila
 yer graphene. Using a variational mean-field theory\, we determine the nor
 mal-state phase diagram of our model as a function of the band filling. Th
 e phase diagram includes robust insulators at even integer fillings\, occa
 sional weaker insulators at odd integer fillings\, and a pattern of flavor
 -symmetry breaking at non-integer fillings. Adding a phonon-mediated inter
 -valley retarded attractive interaction\, we obtain strong-coupling superc
 onducting domes\, whose structure is in qualitative agreement with experim
 ents. Our model elucidates how the intricate form of the interactions and 
 the particle-hole asymmetry of the electronic spectrum determine the phase
  diagram. It also explains how subtle differences between devices may lead
  to experimentally observing different behaviors. A similar model with min
 or modifications is suitable for describing other systems\, such as untwis
 ted and twisted trilayer Graphene.</p>
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