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- W1967339904 abstract "We discuss critical states in random Dirac fermions on a two-dimensional lattice. They are realized on a square lattice using the π-flux state with link disorder. It has a special symmetry and all states are paired which is expressed as {H,γ}=0 in an effective theory of doubled Dirac Fermions with some 4×4 matrix γ. It enables us to treat quite large systems (up to 801×801) without doubling numerically. The multifractal analysis shows the zero mode is given by a critical wave function. Non-zero energy states are also investigated numerically. The density of states vanishes at zero energy as ∼Eα and the exponent α changes with the strength of the randomness. Rapid growth of the localization length near zero energy is observed." @default.
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- W1967339904 date "1998-06-01" @default.
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- W1967339904 title "Disordered critical wave functions of two-dimensional Dirac fermions on a lattice" @default.
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- W1967339904 doi "https://doi.org/10.1016/s0921-4526(98)00320-2" @default.
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