Seminars

Piezoelectricity in marginally twisted WSe2/MoSe2 bilayers

Being an intrinsic feature of non-centrosymmetric materials, piezoelectricity emerges in twisted TMD bilayers under lattice reconstruction.  In the talk I describe an effect and evolution of piezoelectric charge and potential in marginally twisted WSe2/MoSe2bilayers with parallel and antiparallel alignments. For the antiparallel bilayers (twist around 2H alignment) the piezopotential facilitates spatial separation of electrons and holes in lateral direction, which leads to breaking down of interlayer excitons. For the parallel bilayers (twist about 3R alignment) the piezopotential produces network of one-dimensional channels for the interlayer excitons.