Dipolar excitons and interlayer coupling: Optics, dynamics and transport in Janus TMD heterostructures

Principal investigators

  1. Andrey Turchanin, Friedrich-Schiller-Universität Jena [webpage]
  2. Bernhard Urbaszek, Technische Universität Darmstadt [webpage]
  3. Ermin Malic, Philipps-Universität Marburg [webpage]

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Abstract

In this joint experiment-theory study, we combine state-of-the-art growth of Janus-based TMD heterostructures with their optical characterization and microscopic modelling to reveal intriguing exciton phenomena. We explore (i) the role of stacking order, choice of material, twist-angle, temperature and electric field on the optical response, (ii) exciton formation, relaxation and decay processes, where the long radiative lifetime, enhanced phonon-scattering and inherent electric dipole are of crucial importance, and (iii) exciton transport and determine how the moiré potential can be modulated to either trap or release excitons through tuning the stacking order and twist angle in Janus TMD heterostructures.

We combine innovative high-quality CVD sample growth and fabrication with sophisticated optical characterization via cryogenic spatiotemporal photoluminescence and absorption measurements complemented by material-specific and predictive many-particle modeling.