Optical Measurement and Modeling of Interactions between Two Hole Spins or Two Electron Spins in Coupled InAs Quantum Dots

Abstract

Two electron spins in quantum dots coupled through coherent tunneling are generally acknowledged to approximately obey Heisenberg isotropic exchange. This has not been established for two holes. Here we measure the spectra of two holes and of two electrons in two vertically stacked self-assembled InAs quantum dots using optical spectroscopy as a function of electric and magnetic fields. We find that the exchange is approximately isotropic for both systems, but that significant asymmetric contributions, arising from spin-orbit and Zeeman interactions combined with spatial asymmetries, are required to explain large anticrossings and fine-structure energy splittings in the spectra. Asymmetric contributions to the isotropic Hamiltonian for electrons are of the order of a few percent while those for holes are an order of magnitude larger.

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Document Details

Document Type
Technical Report
Publication Date
Mar 12, 2013
Accession Number
ADA591546

Entities

People

  • A. Greilich
  • Allan S. Bracker
  • D. Gammon
  • Daehyun Kim
  • Ştefan C. Bǎdescu

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force Research Laboratories
  • Electrons
  • Energy Levels
  • Ground State
  • Information Processing
  • Magnetic Fields
  • Materials
  • Measurement
  • Military Research
  • Quantum Computing
  • Quantum Dots
  • Quantum Information
  • Quantum Properties
  • Spectra
  • Spectroscopy
  • Spin States
  • Spin-Orbit Interaction

Fields of Study

  • Physics

Readers

  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.

Technology Areas

  • Microelectronics
  • Quantum Computing
  • Quantum Science - Quantum Dots
  • Space