7,982 research outputs found
Fermi Surface Renormalization in Two Spatial Dimensions
We discuss the renormalization induced by interactions of a two-dimensional
truncated Fermi surface (FS) model.Using a field theoretical renormalization
group method we calculate the critical renormalized physical chemical
potential. We show that it either vanishes or approaches a non-zero value. We
argue that the vanishing of the chemical potential is indicative of a further
truncation of the FS we started with and might well represent an insulating
spin liquid phase.Comment: Laboratorio de Supercondutividade Centro Intl.de Fis.da Materia
Condensada-Un
Effective spin-fermion model for strongly correlated electrons
A modified spin-fermion model is proposed to describe the physics of the
underdoped phase of the t-J model of strongly correlated electron
Limitations of the mean field slave-particle approximations
We show that the transformation properties of the mean field slave
boson/fermion order parameters under an action of the global SU(2) group impose
certain restrictions on their applications to describe the phase diagram of the
t-J model.Comment: to appear in Phys. Rev.
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