Effect of Magnetic-Impurity Scattering in Disordered
Two-Dimensional Square Lattices Around Half Filling |
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Authors: | QIAN Feng and YANG Yong-Hong |
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Institution: | 1. Department of Physics, Southeast University, Nanjing 210096, China
;2. National Laboratory of Solid State Microstructures,
Nanjing University, Nanjing 210008, China |
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Abstract: | Weak-localization effect in the presence of magnetic impurities is
studied in disordered two-dimensional tight-binding square lattices around half filling. Both the magnetic and nonmagnetic impurities are assumed to be randomly distributed on small
fractions of the sites, while the nonmagnetic impurities have a
strong potential yielding a unitary-limit scattering. We derive in
details the expressions of diffusive π modes in the retarded-retarded (or advanced-advanced) channel, which result
from the existence of particle-hole symmetry. The quantum interference correction to the density of states is calculated. While the magnetic-impurity scattering suppresses the quantum
correction from π-mode cooperon, it does not affect the contribution of π-mode diffuson. |
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Keywords: | weak localization magnetic impurity density of states two-dimensional lattice |
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