Department of Physics & Astronomy

Excitons and correlated states in Moiré WSe₂/MoSe₂ heterostructures

August 26, 2022l Hit 251
Date : October 5, 2022 16:00 ~
Speaker : 백현준 (서강대학교 물리학과)
Professor : Prof. Dohun Kim, Prof. Sunghoon Jung
Location : 56동105호 +온라인 중계

Van der Waals heterostructures can be designed to confine electrons and holes in unique ways. One remarkable approach is to vertically stack two atomically thin layers of transition metal dichalcogenide (TMD) semiconductors. The relative twist or lattice mismatch between the two layers leads to moiré pattern formation, which modulates the electronic band structure according to the atomic registry. Single-particle wave packets can be trapped in the moiré-induced potential pockets with three-fold symmetry, leading to the formation of trapped interlayer excitons and correlated states. In this talk, I will explain photoluminescence emission of moiré confined excitons in MoSe2/WSe2. Interesting properties of moiré excitons like antibunching, large Stark shift, and doping dependence will be presented. Furthermore, correlated states, such as Mott insulating states and Wigner crystals, observed from moiré heterostructures will be presented.