H. Baek Research Group
@ Sogang Univ.
Moiré patterns are formed when two different lattices are overlaid with small deviations of lattice constants and/or twist angle. By this moire pattern, the electrons/holes in 2D materials can experience modulated potential circumstance in in-plane direction, which has not been realized before in solid state systems.
Exctions (quasi-particles of bound states of electrons and holes) can be spatially localized by moire potentials, and these localized excitons can emit quantum light. This kind of periodically localized quantum emitter array has not been realized in solid state systems. Therefore, this new system is highly expected to provide new chance to explore novel quantum physics such Bose-Hubbard physics.
By the effect of moiré patterns, the kinetic energy of electrons /holes are quenched and become smaller than interaction energy between charges. This enables observation of novel strongly correlated physics. Especially, since the system energy can be highly tunable by external factors like electric field and twist angle, and doping level is also highly controllable by gating, these moire heterostructures are expected to be used as new platforms to simulate quantum behaviors (quantum simulators).