Vertically coupled dipolar exciton molecules

Kobi Cohen, Maxim Khodas, Boris Laikhtman, Paulo V. Santos, Ronen Rapaport

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


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 multiparticle correlations, as well as to the study of dipolar molecular dynamics in a controlled system.

Original languageAmerican English
Article number235310
JournalPhysical Review B
Issue number23
StatePublished - 23 Jun 2016

Bibliographical note

Publisher Copyright:
© 2016 American Physical Society.


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