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Paper   IPM / Nano-Sciences / 11730
School of Nano Science
  Title:   Chemical and magnetic impurity effects on electronic properties of semiconductor quantum wires
  Author(s):  Alireza Saffarzadeh
  Status:   Published
  Journal: Europhys. Lett.
  No.:  21
  Vol.:  76
  Year:  2007
  Pages:   7
  Publisher(s):   The American Physical Society
  Supported by:  IPM
We present a theoretical study of electronic states in magnetic and nonmagnetic semiconductor quantum wires. The effects of chemical and magnetic disorder at paramagnetic temperatures are investigated in single-site coherent potential approximation. It is shown that the nonmagnetic impurity shifts the band of carriers and suppresses the van Hove singularities of the local density of states (LDOS) depending on the value of impurity concentration. The magnetic impurity, however, broadens the band which depends on the strength of exchange coupling, and in the high impurity concentration, the van Hove singularities in the LDOS can completely disappear and the curves become smooth

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