The relation between light absorption and luminescence in laser cooling of two-dimensional semiconductor systems

N. H. Kwong, G. Rupper, B. Gu, R. Binder

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

7 Scopus citations


In efforts underway to achieve laser cooling of semiconductors, an electron-hole population is generated in the sample and maintained in a steady state. The analysis of light absorption by and luminescence from this population is basic to the understanding of feasibility and efficiency issues of the cooling process. It is commonly understood that, when this electron-hole plasma is in quasi-thermal equilibrium (equilibrium at a fixed density), the KMS (Kubo-Martin-Scliwinger) relation holds between its luminescence and absorption spectra: their ratio is proportional to the Bose distribution function characterized by the temperature and chemical potential of the plasma. The proportionality factor, which affects the total luminescence rate, may generally depend on the dimensionality and geometry of the system, In this Contribution, as a preliminary step to extend our theoretical analysis of semiconductor cooling to quantum well systems, we discuss the application of the KMS relation to their spectra. In particular, we derive and discuss the geometrical proportionality factor in the KMS relation forquantum wells and compare it to its counterpart for bulk semiconductors.

Original languageEnglish (US)
Title of host publicationLaser Cooling of Solids
StatePublished - 2007
EventLaser Cooling of Solids - San Jose, CA, United States
Duration: Jan 24 2007Jan 25 2007

Publication series

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


OtherLaser Cooling of Solids
Country/TerritoryUnited States
CitySan Jose, CA

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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