Spinon-holon binding in $ t-J $ model
Phys. Rev. B, 71 (17):
172509 (May 2005)DOI: 10.1103/PhysRevB.71.172509
Abstract
Using a phenomenological model, we discuss the consequences of spinon-holon
binding in the U(1) slave-boson approach to t-J model in the weak-coupling
limit. We find that spinon-holon binding produces a pseudogap 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 merges with the pseudogap smoothly
as temperature T→0. The quasiparticles in the superconducting state
are coupled to external electromagnetic field with a coupling constant
of order xγ∕2 (x=hole concentration), where 0⩽γ⩽1.