Collapse of Charge Gap in Random Mott Insulators

Details Collapse of Charge Gap in Random Mott Insulators Collapse of Charge Gap in Random Mott Insulators

1998-07-14

arxiv.org/abs/cond-mat/9807204v1

Physics

Condensed Matter

Strongly Correlated Electrons

RevTeX with 3 postscript figures

Scientific paper

10.1103/PhysRevB.58.15314

Effects of randomness on interacting fermionic systems in one dimension are investigated by quantum Monte-Carlo techniques. At first, interacting spinless fermions are studied whose ground state shows charge ordering. Quantum phase transition due to randomness is observed associated with the collapse of the charge ordering. We also treat random Hubbard model focusing on the Mott gap. Although the randomness closes the Mott gap and low-lying states are created, which is observed in the charge compressibility, no (quasi-) Fermi surface singularity is formed. It implies localized nature of the low-lying states.

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