Ultrafast Physics in Microstructure and Alloy Systems

Abstract

We have continued to employ picosecond and femtosecond techniques to investigate ultrafast physics in semiconductor bulk and microstructures. We have (i) determined exciton dissociation time by ionized carbon acceptors in Gallium Arsenides Quantum wells; (ii) proposed and demonstrated a new optical approach to measure directly momentum relaxation times which are related to electron mobilities in QWs; (iii) determined intervalley scattering in GaAs bulk and double-barrier tunneling structures experimentally and theoretically; (iv) determined X6T6 scattering time of 0.5 ps in GaAs by picosecond IR absorption spectroscopy; and (v) observed stimulated excitonic emission in spherical (dot) quantum wells under picosecond UV excitation at room temperature.

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Document Details

Document Type
Technical Report
Publication Date
Jan 12, 1989
Accession Number
ADA203639

Entities

People

  • Robert Alfano

Organizations

  • City College of New York

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Dynamics
  • Electron Mobility
  • Electrons
  • Energy Bands
  • Excitons
  • Femtosecond Time
  • Free Electrons
  • Optical Properties
  • Physics
  • Picosecond Time
  • Quantum Wells
  • Semiconductors
  • Shock Waves
  • Spectroscopy
  • Two Dimensional
  • Wave Mixing
  • Waves

Fields of Study

  • Materials science
  • Physics

Readers

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

Technology Areas

  • Microelectronics
  • Quantum Computing