539 research outputs found
Sign changes and resonance of intrinsic spin Hall effect in two-dimensional hole gas
The intrinsic spin Hall conductance shows rich sign changes by applying a
perpendicular magnetic field in a two-dimensional hole gas. Especially, a
notable sign changes can be achieved by adjusting the characteristic length of
the Rashba coupling and hole density at moderate magnetic fields. This sign
issue may be easily realized in experiments. The oscillations of the intrinsic
spin Hall conductance as a function of 1/ is nothing else but Shubnikov-de
Haas oscillations, and the additional beatings can be quantitatively related to
the value of the spin-orbit coupling parameter. The Zeeman splitting is too
small to introduce effective degeneracy between different Landau levels in a
two-dimensional hole gas, and the resonant intrinsic spin Hall conductance
appears in high hole density and strong magnetic field due to the transition
between mostly spin- holes and spin-3/2 holes is confirmed. Two likely
ways to establish intrinsic spin Hall effect in experiments and a possible
application are suggested.Comment: Accepted for publication in Applied Physics Letters, an enlarged
version, 5 pages, 4 fig
Unusual charge transport and spin response of doped bilayer triangular antiferromagnets
Within the t-J model, the charge transport and spin response of the doped
bilayer triangular antiferromagnet are studied by considering the bilayer
interaction. Although the bilayer interaction leads to the band splitting in
the electronic structure, the qualitative behaviors of the physical properties
are the same as in the single layer case. The conductivity spectrum shows the
low-energy peak and unusual midinfrared band, the temperature dependent
resistivity is characterized by the nonlinearity metallic-like behavior in the
higher temperature range, and the deviation from the metallic-like behavior in
the lower temperature range, and the commensurate neutron scattering peak near
the half-filling is split into six incommensurate peaks in the underdoped
regime, with the incommensurability increases with the hole concentration at
lower dopings, and saturates at higher dopings.Comment: 8 pages, Revtex, five figures are include
A gauge invariant dressed holon and spinon description of the normal-state of underdoped cuprates
A partial charge-spin separation fermion-spin theory is developed to study
the normal-state properties of the underdoped cuprates. In this approach, the
physical electron is decoupled as a gauge invariant dressed holon and spinon,
with the dressed holon behaving 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 representing the
amplitude part of the spin degree of freedom. The electron local constraint for
single occupancy is satisfied. Within this approach, the charge and spin
dynamics of the underdoped cuprates are studied based on the t-t'-J model. It
is shown that the charge dynamics 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
dynamics.Comment: 10 pages, 7 figures, corrected typo
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