Journal
PHYSICAL REVIEW LETTERS
Volume 113, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.186803
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Funding
- DFG [SPP 1459, 1666]
- GIF
- BMBF
- EU FP7 IRSES InterNoM network
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We study quantum interference effects in a two-dimensional chiral metal (bipartite lattice) with vacancies. We demonstrate that randomly distributed vacancies constitute a peculiar type of chiral disorder leading to strong modifications of critical properties at zero energy as compared to those of conventional chiral metals. In particular, the average density of states diverges as rho alpha E-1 vertical bar lnE vertical bar(-3/2) and the correlation length L-c alpha root vertical bar lnE vertical bar in the limit E -> 0. When the average density of vacancies is different in the two sublattices, a finite concentration of zero modes emerges and a gap in the quasiclassical density of states opens around zero energy. Interference effects smear this gap, resulting in exponentially small tails at low energies.
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