Coulomb-mediated interactions of charge-transfer excitons in TMD lateral heterostructures

Authors:
Open Access
Publisher website
Google Scholar
Abstract
Lateral heterostructures of transition-metal dichalcogenides (TMDs) host spatially separated charge-transfer (CT) excitons. While analogous to interlayer excitons in vertical TMD heterostructures, these interfacial excitons possess much larger in-plane dipoles of several nanometers and an additional center-of-mass quantization. Here, we investigate mutual interactions between these highly dipolar CT excitons using a quantum mechanical approach. Accounting for the dipolar and quantum exchange interactions, we evaluate the experimentally accessible density-dependent energy renormalization and predict a net energy blueshift of a few meV for bound CT excitons. Interestingly, for small dipole moments, the energy renormalization displays a quadratic dependence with respect to the dipole moment, in contrast to the linear dependence found in vertical TMD heterostructures. We show that spatial energy offset and temperature are the key tuning knobs for controlling the density-dependent excitonic response. Overall, our results contribute to a better microscopic understanding of CT excitons and their interactions in lateral TMD heterostructures.
All Related Versions
Funding Information
  • Deutsche Forschungsgemeinschaft (535253440)
  • Deutsche Forschungsgemeinschaft (542873285)
  • Alexander von Humboldt-Stiftung
  • Deutsche Forschungsgemeinschaft (535253440)
  • Deutsche Forschungsgemeinschaft (542873285)
  • Alexander von Humboldt-Stiftung

This publication has 61 references indexed in Scilit: