Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1997-08-14
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages, RevTex, 3 eps figures
Scientific paper
10.1103/PhysRevB.56.9360
We investigate the effects of quenched disorder on two chain Hubbard models at half-filling by using bosonization and renormalization group methods. It is found that the sufficiently strong forward scattering due to impurities and the random gauge field, which is generated by impurity backward scattering, destroy the charge gaps as well as the spin gaps. Random backward scattering due to impurities then drives the resulting massless phase to the Anderson localization phase. For intermediate strength of random forward scattering, however, the spin gaps still survive, and only one of the charge gaps is collapsed. In this parameter region, one of the charge degrees of freedom is in the Anderson localized state, while the other one is still in the massive state.
Fujimoto Satoshi
Kawakami Norio
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