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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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Anomalous Exciton Hall Effect.

V K Kozin1,2, V A Shabashov2,3, A V Kavokin4,5,6

  • 1Science Institute, University of Iceland, Dunhagi-3, IS-107 Reykjavik, Iceland.

Physical Review Letters
|February 5, 2021
PubMed
Summary
This summary is machine-generated.

A novel anomalous exciton Hall effect is discovered, where magnetic fields and impurity scattering redirect exciton flow without electric fields. This effect can spatially separate dark and bright excitons, offering new research tools.

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Area of Science:

  • Condensed Matter Physics
  • Semiconductor Physics

Background:

  • Electrically neutral excitons are known to respond to crossed electric and magnetic fields.
  • Exciton behavior in response to external fields is crucial for understanding semiconductor properties.

Purpose of the Study:

  • To investigate the influence of charged impurities and magnetic fields on exciton flow in the absence of external electric fields.
  • To theoretically describe a new phenomenon termed the anomalous exciton Hall effect.

Main Methods:

  • Development of a theoretical framework to explain the anomalous exciton Hall effect.
  • Analysis of exciton scattering by charged impurities under magnetic field influence.

Main Results:

  • Demonstrated that exciton flow can be redirected perpendicular to both magnetic field and impurity scattering direction.
  • Quantified the effect, showing it is weak for bright excitons but significant for dark excitons in GaAs quantum wells.

Conclusions:

  • The anomalous exciton Hall effect provides a mechanism for exciton redirection independent of external electric fields.
  • This effect offers a novel method for the spatial separation of dark and bright excitons based on their differing lifetimes and scattering properties.