Vertically-coupled dipolar exciton molecules

Abstract

While the interaction potential between two dipoles residing in a single plane is repulsive, in a system of two vertically adjacent layers of dipoles it changes from repulsive interaction in the long range to attractive interaction in the short range. Here we show that for dipolar excitons in semiconductor heterostructures, such a potential may give rise to bound states if two such excitons are excited in two separate layers, leading to the formation of vertically coupled dipolar exciton molecules. Our calculations prove the existence of such bound states and predict their binding energy as a function of the layers separation as well as their thermal distributions. We show that these molecules should be observed in realistic systems such as semiconductor coupled quantum well structures and the more recent van-der-Waals bound heterostructures. Formation of such molecules can lead to new effects such as a collective dipolar drag between layers and new forms of multi-particle correlations, as well as to the study of dipolar molecular dynamics in a controlled system.

References in corpus (8)

• Observation of Long-Lived Interlayer Excitons in Monolayer MoSe2-WSe2 Heterostructures
• High-temperature superfluidity with indirect excitons in van der Waals heterostructures
• Giant Rydberg Excitons in Cuprous Oxide
• Analysis of the exciton-exciton interaction in semiconductor quantum wells
• Particle correlations and evidence for dark state condensation in a cold dipolar exciton fluid
• Two-dimensional scattering and bound states of polar molecules in bilayers
• A dark incompressible dipolar liquid of excitons
• Transport of dipolar excitons in (Al,Ga)N/GaN quantum wells

Cited by in corpus (6)

• Attractive dipolar coupling between stacked exciton fluids
• Radiative lifetimes of dipolar excitons in double quantum-wells
• Collective interlayer pairing and pair superfluidity in vertically stacked layers of dipolar excitons
• Attractive and repulsive dipolar interaction in bilayers of indirect excitons
• Protocol for Fermionic Positive-Operator-Valued Measures
• Attractive interactions, molecular complexes, and polarons in coupled dipolar exciton fluids