Transition Metal Dichalcogenides Heterostructure

Research Highlight

Transition Metal Dichalcogenides (TMDs) have emerged as a novel platform for investigating excitonic physics. The intrinsic valley pseudospin property could carry information for next-generation electronics and optoelectronics. When stacking atomically thin TMDs on top of each other forming hererobilayers, the phenomena can be ever more interesting. Fine structure and the selection rules of the excitonic states vary drastically due to different stacking configurations. In the lab, we are able to prepare heterobilayer samples with commensurate stacking or stacking with small twist angles and look at the light-matter interaction properties via emission, absorption, time-resolved spectrum, etc. Samples with small twist angles will form moiré superlattice with long periodicity. Subtle changes in the twist angle affects the exciton dynamics and the exciton-exciton interactions, which provides tunability for the excitonic platform. New exciting two-dimensional condensed matter physics are yet to be discovered!

Keywords

  • Transition metal dichalcogeniges

  • Heterobilayer

  • Valley

  • Excitons

  • Moiré Superlattice

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