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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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Published on: May 27, 2020

Electrostatic conveyer for excitons.

A G Winbow1, J R Leonard, M Remeika

  • 1Department of Physics, University of California at San Diego, La Jolla, California 92093-0319, USA.

Physical Review Letters
|June 15, 2011
PubMed
Summary
This summary is machine-generated.

We observed excitons in moving lattices, finding a transition between localized and delocalized states. This dynamical localization-delocalization transition depends on exciton density and lattice properties.

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Area of Science:

  • Condensed matter physics
  • Quantum mechanics
  • Solid-state physics

Background:

  • Indirect excitons are crucial quasiparticles in semiconductor physics.
  • Controlling exciton dynamics is key for quantum information and optoelectronic devices.
  • Moving potential landscapes offer a novel approach to manipulate excitons.

Purpose of the Study:

  • To investigate the behavior of indirect excitons within dynamically controlled potential landscapes.
  • To explore the phenomenon of dynamical localization-delocalization transitions in these systems.
  • To determine the factors influencing this transition, including exciton density and lattice parameters.

Main Methods:

  • Creation of moving lattices-conveyers using AC voltages on surface electrodes.
  • Systematic variation of lattice wavelength, amplitude, and velocity via electrode design and applied AC frequencies.
  • Analysis of exciton localization and delocalization dynamics as a function of density and lattice parameters.

Main Results:

  • Observed a clear dynamical localization-delocalization transition for indirect excitons.
  • Quantified the dependence of this transition on exciton density.
  • Determined the influence of conveyer amplitude and velocity on the transition threshold.

Conclusions:

  • Dynamical lattices provide an effective method for controlling indirect exciton states.
  • The observed transition is sensitive to both particle density and the characteristics of the moving potential.
  • This work offers insights into exciton transport and potential applications in quantum devices.