6,224 research outputs found
Spin-charge coupling in quantum wires at zero magnetic field
We discuss an approximation for the dynamic charge response of nonlinear
spin-1/2 Luttinger liquids in the limit of small momentum. Besides accounting
for the broadening of the charge peak due to two-holon excitations, the
nonlinearity of the dispersion gives rise to a two-spinon peak, which at zero
temperature has an asymmetric line shape. At finite temperature the spin peak
is broadened by diffusion. As an application, we discuss the density and
temperature dependence of the Coulomb drag resistivity due to long-wavelength
scattering between quantum wires.Comment: 16 pages, 5 figures. This is an extended version of "Coulomb drag
from spin-charge coupling at zero magnetic field
Coupled electronic and morphologic changes in graphene oxide upon electrochemical reduction
Peer reviewedPostprin
Boundary Modes in the Chamon Model
We study the fracton phase described by the Chamon model in a manifold with a
boundary. The new processes and excitations emerging at the boundary can be
understood by means of a diagrammatic framework. From a continuum perspective,
the boundary theory is described by a set of scalar fields in similarity with
the standard -matrix Chern-Simons theory. The continuum theory recovers the
gapped boundaries of the lattice model once we include sufficiently strong
interactions that break charge conservation. The analysis of the perturbative
relevance of the leading interactions reveals a regime in which the Chamon
model can have a stable gapless fractonic phase at its boundary.Comment: 29 pages, 6 figures, extended discussions, references added, minor
correction
Exact edge singularities and dynamical correlations in spin-1/2 chains
Exact formulas for the singularities of the dynamical structure factor,
S^{zz}(q,omega), of the S=1/2 xxz spin chain at all q and any anisotropy and
magnetic field in the critical regime are derived, expressing the exponents in
terms of the phase shifts which are known exactly from the Bethe ansatz
solution. We also study the long time asymptotics of the self-correlation
function . Utilizing these results to supplement very
accurate time-dependent Density Matrix Renormalization Group (DMRG) for short
to moderate times, we calculate S^{zz}(q,omega) to very high precision.Comment: 4 pages, 1 figure, 1 table, published versio
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