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SUMMARY:Moiré superlattices in twisted bilayers of transition metal dicha
 lcogenides - Prof. Vladimir Fal'ko\, University of Manchester
DTSTART:20200130T141500Z
DTEND:20200130T151500Z
UID:TALK129565@talks.cam.ac.uk
CONTACT:Bartomeu Monserrat
DESCRIPTION:Atomically-thin layers of two-dimensional materials can be ass
 embled in vertical stacks held together by van der Waals forces\, allowing
  for coupling between monolayer crystals with incommensurate lattices and 
 arbitrary mutual rotation. A consequence of using these degrees of freedom
  is the emergence of a periodicity in the local atomic registry of the con
 stituent crystal structures\, known as a moiré superlattice. Here\, we di
 scuss the regimes for the formation of moiré SL in bilayers of transition
  metal dichalcogenides\, distinguishing between the rigid-crystal behavior
  of the two layers and lattice reconstruction into perfect stacking domain
 s (2H or 3R type\, depending on the orientation of the layers)\, separated
  by the screw dislocation networks. For both of these two regimes\, we dis
 cuss the effect of the superlattice on electronic and optical properties o
 f various twisted TMD homo- and heterobilayers\, including the tunneling c
 haracteristics\, piezoelectricity effects in the strongly reconstructed bi
 layers\, flat miniband formation for holes in twisted heterostructures\, a
 nd the SL effects for the excitons.\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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