Spinon-Holon binding in $t-J$ model

Details Spinon-Holon binding in $t-J$ model Spinon-Holon binding in $t-J$ model

2004-08-17

arxiv.org/abs/cond-mat/0408374v2

Physics

Condensed Matter

Superconductivity

9 pages, 3 figures

Scientific paper

10.1103/PhysRevB.71.172509

Using a phenomenological model, we discuss the consequences of spinon-holon binding in the U(1) slave-boson approach to $t-J$ model. Within a small $x$ ($x=$ hole concentration) expansion, we show that spinon-holon binding produces a pseudo-gap normal state with a segmented Fermi surface and the superconducting state is formed by opening an "additional" d-wave gap on the segmented Fermi surface. The d-wave gap merge with the pseudo-gap smoothly as temperature $T\to0$. The quasi-particles in the superconducting state are coupled to external electromagnetic field with a coupling constant of order $x^{\gamma}$ where $0\leq\gamma\leq1/2$, depending on the strength of the effective spinon-holon binding potential.

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