Monte Carlo simulation of intersubband relaxation in single and multiple quantum wells

Stephen M. Goodnick, S. Pennathur, Paolo Lugli, M. Gulia

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We studied intersubband relaxation of carries during ultrafast photoexcitation in single and coupled quantum wells using ensemble Monte Carlo simulation, Intra- and intersubband scattering due to polar and nonpolar optical phonons, acoustic phonons, and intercarrier scattering are included in the simulation. The polar optical mode description is given in terms of a two-pole dielectric continuum model for the alloy barriers. In the present work we focus on relaxation when the 2-1 subband spacing is smaller than the optical phonon energy so that suppression of the intersubband polar optical phonon scattering rate occurs. Our results for a single well show that intercarrier intersubband scattering dominates over acoustic phonon scattering during the initial relaxation of carriers from 2-1, with a strong contribution due to polar optical phonon emission from the tails of the heated distributions as well. We have studied optical pumping for a 3 level coupled quantum well system in which ΔE12 is less than h approximately ega0, and calculate the change in occupancy of the excited subbands through pumping of the 1-3 transition.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsDavid K. Ferry, Henry M. van Driel
Number of pages7
StatePublished - Dec 1 1994
Externally publishedYes
EventUltrafast Phenomena in Semiconductors - Los Angeles, CA, USA
Duration: Jan 27 1994Jan 28 1994

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherUltrafast Phenomena in Semiconductors
CityLos Angeles, CA, USA

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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