Vertically-coupled dipolar exciton molecules

  title={Vertically-coupled dipolar exciton molecules},
  author={Kobi Cohen and Maxim Khodas and Boris Laikhtman and Paulo Ventura Santos and Ronen Rapaport},
  journal={Physical Review B},
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… 

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