Quantum Simulation of Multiple-Exciton Generation in a Nanocrystal by a Single Photon

Abstract

We have shown theoretically that efficient multiple exciton generation (MEG) by a single photon can be observed in small nanocrystals (NCs). Our quantum simulations that include hundreds of thousands of exciton and multi-exciton states demonstrate that the complex time-dependent dynamics of these states in a closed electronic system yields a saturated MEG effect on a picosecond timescale. Including phonon relaxation confirms that efficient MEG requires the exciton-biexciton coupling time to be faster than exciton relaxation time.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2010
Accession Number
ADA530073

Entities

People

  • Alexander Efros
  • Andrew Shabaev
  • C. S. Hellberg
  • Verne L. Jacobs
  • Wayne Witzel

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Angular Momentum
  • Bulk Semiconductors
  • Demographic Cohorts
  • Dielectric Permittivity
  • Electron Holes
  • Electrons
  • Energy
  • Energy Bands
  • Energy Gaps
  • Energy Levels
  • Ground State
  • Momentum
  • Nanocrystals
  • Picosecond Time
  • Relaxation Time
  • Simulations
  • Spherical Harmonics

Fields of Study

  • Physics

Readers

  • Mathematics or Statistics
  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.

Technology Areas

  • Microelectronics
  • Quantum Computing