Chemical and magnetic impurity effects on electronic properties of semiconductor quantum wires

Details Chemical and magnetic impurity effects on electronic properties of semiconductor quantum wires Chemical and magnetic impurity effects on electronic properties of semiconductor quantum wires

2008-06-07

arxiv.org/abs/0806.1282v1

Phys. Rev. B 76, 214201 (2007)

Physics

Condensed Matter

Disordered Systems and Neural Networks

7 pages, 6 figures

Scientific paper

10.1103/PhysRevB.76.214201

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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