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Critical conductance of the chiral two-dimensional random flux model

✍ Scribed by Ludwig Schweitzer; Peter Markoš

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
182 KB
Volume
40
Category
Article
ISSN
1386-9477

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✦ Synopsis

The two-terminal conductance of a random flux model defined on a square lattice is investigated numerically at the band center using a transfer matrix method. Due to the chiral symmetry, there exists a critical point where the ensemble averaged mean conductance is scale independent. We also study the conductance distribution function which depends on the boundary conditions and on the number of lattice sites being even or odd. We derive a critical exponent n ¼ 0:42 AE 0:05 for square samples of even width using one-parameter scaling of the conductance. This result could not be obtained previously from the divergence of the localization length in quasi-onedimensional systems due to pronounced finite-size effects.

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