Study of Harper's Equation for the 2-D Systems of Antiferromagnetically Correlated Electrons in an External Magnetic Field

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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, $p/q$.
21 pages, 6 figures. Enlarged version of cond-mat/9609225

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Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/28569

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/9808328
 http://arxiv.org/abs/cond-mat/9808328

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arXiv