8,676 research outputs found
Coordinate Representation of the One-Spinon One-Holon Wavefunction and Spinon-Holon Interaction
By deriving and studying the coordinate representation for the one-spinon
one-holon wavefunction we show that spinons and holons in the supersymmetric model with interaction attract each other. The interaction causes
a probability enhancement in the one-spinon one-holon wavefunction at short
separation between the particles. We express the hole spectral function for a
finite lattice in terms of the probability enhancement, given by the one-spinon
one-holon wavefunction at zero separation. In the thermodynamic limit, the
spinon-holon attraction turns into the square-root divergence in the hole
spectral function.Comment: 20 pages, 3 .eps figure
Gauge invariant dressed holon and spinon in doped cuprates
We develop a partial charge-spin separation fermion-spin theory implemented
the gauge invariant dressed holon and spinon. In this novel approach, the
physical electron is decoupled as the gauge invariant dressed holon and spinon,
with the dressed holon behaviors like a spinful fermion, and represents the
charge degree of freedom together with the phase part of the spin degree of
freedom, while the dressed spinon is a hard-core boson, and represents the
amplitude part of the spin degree of freedom, then the electron single
occupancy local constraint is satisfied. Within this approach, the charge
transport and spin response of the underdoped cuprates is studied. It is shown
that the charge transport is mainly governed by the scattering from the dressed
holons due to the dressed spinon fluctuation, while the scattering from the
dressed spinons due to the dressed holon fluctuation dominates the spin
response.Comment: 8 pages, Revtex, three figures are include
Exact two-holon wave functions in the Kuramoto-Yokoyama model
We construct the explicit two-holon eigenstates of the SU(2)
Kuramoto-Yokoyama model at the level of explicit wave functions. We derive the
exact energies and obtain the individual holon momenta, which are quantized
according to the half-Fermi statistics of the holons.Comment: 16 pages revte
Combination Rules, Charge Symmetry, and Hall Effect in Cuprates
The rule relating the observed Hall coefficient to the spin and charge
responses of the uniform doped Mott insulator is derived. It is essential to
include the contribution of holon and spinon three-current correlations to the
effective action of the gauge field. In the vicinity of the Mott insulating
point the Hall coefficient is holon dominated and weakly temperature dependent.
In the vicinity of a point of charge conjugation symmetry the holon
contribution to the observed Hall coefficient is small: the Hall coefficient
follows the temperature dependence of the diamagnetic susceptibility with a
sign determined by the Fermi surface shape. NOTE: document prepared using
REVTEX. (3 Figs, not included, available on request from: [email protected])Comment: 8 page
A gauge approach to the "pseudogap" phenomenology of the spectral weight in high Tc cuprates
We assume the t-t'-J model to describe the CuO_2 planes of hole-doped
cuprates and we adapt the spin-charge gauge approach, previously developed for
the t-J model, to describe the holes in terms of a spinless fermion carrying
the charge (holon) and a neutral boson carrying spin 1/2 (spinon), coupled by a
slave-particle gauge field. In this framework we consider the effects of a
finite density of incoherent holon pairs in the normal state. Below a crossover
temperature, identified as the experimental "upper pseudogap", the scattering
of the "quanta" of the phase of the holon-pair field against holons reproduces
the phenomenology of Fermi arcs coexisting with gap in the antinodal region. We
thus obtain a microscopic derivation of the main features of the hole spectra
due to pseudogap. This result is obtained through a holon Green function which
follows naturally from the formalism and analytically interpolates between a
Fermi liquid-like and a d-wave superconductor behavior as the coherence length
of the holon pair order parameter increases. By inserting the gauge coupling
with the spinon we construct explicitly the hole Green function and calculate
its spectral weight and the corresponding density of states. So we prove that
the formation of holon pairs induces a depletion of states on the hole Fermi
surface. We compare our results with ARPES and tunneling experimental data. In
our approach the hole preserves a finite Fermi surface until the
superconducting transition, where it reduces to four nodes. Therefore we
propose that the gap seen in the normal phase of cuprates is due to the thermal
broadening of the SC-like peaks masking the Fermi-liquid peak. The Fermi arcs
then correspond to the region of the Fermi surface where the Fermi-liquid peak
is unmasked.Comment: 10 figures, comments and references added, 2 figures change
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