Homogeneous Nucleation of Opposite Moving Dipole Domains and Current Self-Oscillations in Undoped Photoexcited Superlattices Articles uri icon

publication date

  • March 2008

start page

  • 1209

end page

  • 1211

issue

  • 5

volume

  • 40

international standard serial number (ISSN)

  • 1386-9477

electronic international standard serial number (EISSN)

  • 1873-1759

abstract

  • A model for charge transport in undoped photoexcited semiconductor superlattices with field-dependent recombination is proposed and analyzed. Under dc voltage bias and large photoexcitation, there appear self-sustained oscillations of the current due to repeated homogeneous nucleation of a number of charge dipole waves inside the sample. Different from the case of a constant recombination coefficient, nucleated dipole waves may split in two oppositely moving dipoles.