+++ONLINE KOLLOQUIUM+++ (MCQST-Kolloquium) Strong electronic correlations in 2D semiconductors (Prof. Dr. Atac Imamoglu)
- Datum: 10.11.2020
- Uhrzeit: 14:30
- Vortragende(r): Prof. Dr. Atac Imamoglu
- ETH Zürich, Switzerland
- Ort: +++ONLINE KOLLOQUIUM+++
In this talk, I will present experiments where we use optical spectroscopy to demonstrate that electrons in a pristine monolayer semiconductor form a Wigner crystal. The interactions between resonantly injected excitons and electrons arranged in a periodic lattice modify the exciton band structure so that it exhibits a new umklapp resonance, heralding the presence of charge order. Remarkably, the combination of a relatively high electron mass and reduced dielectric screening allows us to observe electron crystals even in the absence of external magnetic fields.