Interface Sensitive Study of Spin Injection, Transport and Relaxation in Ferromagnet-Semiconductor Quantum Well Systems for Spin Applications

Abstract

In this report, we present our observation of optically excited nonequilibrium spin dynamics in (Ga,Mn)As at room temperature. Our observation demonstrates two different regimes: 1) an initial ultrafast oscillatory behavior during the subpicosecond and picosecond time scale after photo-excitation, which we find to be related to photo-induced carrier (electrons and holes) spins; 2) a slow demagnetization over hundreds of picoseconds, which, we believe, results from not only strong-coupled hole-Mn spins but also interactions between electron spins and Mn moments.

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Document Details

Document Type
Technical Report
Publication Date
Nov 29, 2006
Accession Number
ADA459452

Entities

People

  • Jinbo Qi
  • Norman Tolk
  • Ying Xu

Organizations

  • Vanderbilt University

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Conduction Bands
  • Dynamics
  • Electrons
  • Energy Bands
  • Equations
  • Excitation
  • Kerr Effects
  • Low Temperature
  • Magnetic Fields
  • Magnetization
  • Materials
  • Optical Kerr Effect
  • Picosecond Time
  • Relaxation Time
  • Rotation
  • Semiconductors
  • Waveplates

Fields of Study

  • Physics

Readers

  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.
  • Superconducting Magnet Technology

Technology Areas

  • Microelectronics
  • Quantum Computing
  • Quantum Science - Quantum Dots