Random magnetic flux problem in a quantum wire

Article

关键词: DENOMINATOR FILLING FRACTIONS;    OFF-DIAGONAL DISORDER;    RANDOM DIRAC FERMIONS;    2 DIMENSIONS;    CONDUCTANCE FLUCTUATIONS;    SCALING THEORY;    FIELD-THEORY;    ANDERSON LOCALIZATION;    FOURIER-ANALYSIS;    MOBILITY EDGE;   

DOI  :  10.1103/PhysRevB.59.13221

来源: SCIE

【 摘 要 】

The random magnetic-flux problem on a lattice in a quasi-one-dimensional (wire) geometry is studied both analytically and numerically. The first two moments of the conductance are obtained analytically. Numerical simulations for the average and variance of the conductance agree with the theory. We find that the center of the band epsilon=0 plays a special role. Away from epsilon=0, transport properties are those of a disordered quantum wire in the standard unitary symmetry class. At the band center epsilon=0, the dependence on the wire length of the conductance departs from the standard unitary symmetry class and is governed by a different universality class, the chiral unitary symmetry class. The most remarkable property of this universality class is the existence of an even-odd effect in the localized regime: Exponential decay of the average conductance for an even number of channels is replaced by algebraic decay for an odd number of channels. [S0163-1829(99)06419-X].

【 授权许可】

Free