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The conductance of a quantum wire with off-diagonal disorder that preserves asublattice symmetry (the random hopping problem with chiral symmetry) isconsidered. Transport at the band center is anomalous relative to the standardproblem of Anderson localization both in the diffusive and localized regimes.In the diffusive regime, there is no weak-localization correction to theconductance and universal conductance fluctuations are twice as large as in thestandard cases. Exponential localization occurs only for an even number oftransmission channels in which case the localization length does not depend onwhether time-reversal and spin rotation symmetry are present or not. For an oddnumber of channels the conductance decays algebraically. Upon moving away fromthe band center transport characteristics undergo a crossover to those of thestandard universality classes of Anderson localization. This crossover iscalculated in the diffusive regime.Comment: 22 pages, 9 figure

Crossover from the chiral to the standard universality classes in the conductance of a quantum wire with random hopping only