Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 42: Charge Order
TT 42.3: Vortrag
Dienstag, 13. März 2018, 10:45–11:00, HFT-FT 131
Dynamical manipulation of crystalline symmetry — Tanay Nag, R-J Slager, and •Takashi Oka — Max Planck Institute for Physics of Complex Systems (MPI-PKS), Dresden, Germany
Our main aim is to break a discrete symmetry of honeycomb lattice model by introducing suitable laser field. Unlike the laser field with single frequency that is not able to generate a inversion symmetry breaking on-site momentum independent mass term, a bi-harmonic laser filed with commensurate frequencies can break the C3 symmetry of the model and lead to a finite charge density wave order. We show that there is a possibility that the CDW shows memory effect (hysteresis). In order to enhance the CDW order, we consider an extended Hubbard interaction implemented through a mean field approach. We explain the synchronization dynamics of CDW in the switch on and switch off region by making resort to a simple toy model namely, Kuramoto model. Furthermore, we show that van Hove singularity in density of states for this model substantially contributes to the dynamics.