Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1998-08-29
Physics
Condensed Matter
Strongly Correlated Electrons
21 pages, 6 figures. Enlarged version of cond-mat/9609225
Scientific paper
Considering interacting (antiferromagnetically correlated) electrons, we derive a generalized Harper's equation for the square lattice of infinite size. We obtain an analytic expression for the density of states from the newly derived Harper's equation. We present a predicted phase diagram of staggered magnetization in the plane of temperature vs doping rate and discover a possibility of reentrant behavior of the staggered magnetization even in the presence of applied magnetic field. It is shown that below a critical electron correlation strength (Coulomb repulsion) the staggered magnetization in the presence of magnetic field vanishes at an even denominator $q$ value but not at odd $q$ of a given magnetic flux quantum per plaquette, $p/q$.
Doh Hyeonjin
Hong Seung-Pyo
Salk Sung-Ho Suck
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