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Abstract: We discuss the issue of phase separation in the SU2 slave boson theory ofWen and Lee of the doped Mott insulator. It is shown that the constraintstructure of the theory leads to the interpretation of the holons to havehard-core interactions, which is demonstrated further by studying the emptylimit no electrons. Surprisingly, with hard-core interactions even the emptylimit is described well by the slave-boson theory, both as an energy densityand with the regard to dynamical properties. The consequences are investigatedin the overdoped superconducting regime, where both phase separation and a d+sstructure of the order parameter is obtained. This s-wave component is alreadyimminent in the description of the hole in the slave boson theory. Theinteracting nature of the holons also lead to sound modes in thesingle-electron propagator. The novel idea of the isospin spiral is introduced,based on the projective symmetry principles of Wen. This isospin spiralexplains the coexistence of superconductivity and the Mott insulating state,being the consequence of phase separation. Secondly, it might be able toexplain why nodal fermions survive in the presence of charge inhomogeneities.



Author: B.W.A.Leurs, K.E. Luna, J. Zaanen

Source: https://arxiv.org/







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