4,774 research outputs found
Density-Matrix Renormalization Group Study of Trapped Imbalanced Fermi Condensates
The density-matrix renormalization group is employed to investigate a
harmonically-trapped imbalanced Fermi condensate based on a one-dimensional
attractive Hubbard model. The obtained density profile shows a flattened
population difference of spin-up and spin-down components at the center of the
trap, and exhibits phase separation between the condensate and unpaired
majority atoms for a certain range of the interaction and population imabalance
. The two-particle density matrix reveals that the sign of the order
parameter changes periodically, demonstrating the realization of the
Fulde-Ferrell-Larkin-Ovchinnikov phase. The minority spin atoms contribute to
the quasi-condensate up to at least . Possible experimental
situations to test our predictions are discussed.Comment: 4 pages, 3 figures; added references; accepted for publication in
Phys. Rev. Let
Dynamical theory of superfluidity in one dimension
A theory accounting for the dynamical aspects of the superfluid response of
one dimensional (1D) quantum fluids is reported. In long 1D systems the onset
of superfluidity is related to the dynamical suppression of quantum phase slips
at low temperatures. The effect of this suppression as a function of frequency
and temperature is discussed within the framework of the relevant correlation
function that is accessible experimentally, namely the momentum response
function. Application of these results to the understanding of the superfluid
properties of helium confined in nanometer-size pores, edge dislocations in
solid He, and ultra-cold atomic gases is also briefly discussed.Comment: 4.4 pages, 2 eps figures, and 1 page of supplementary informatio
Mass Spectrum Dependence of Higgs-mediated mu-e Transition in the MSSM
In this paper, we study non-decoupling - transition effects by
Higgs-mediated contribution in the MSSM, when some SUSY mass parameters are
much greater than TeV. In order to treat CP-odd Higgs mass as a
free parameter, we consider the non-universal Higgs mass model (NUHM), and
assume the only left- or right-handed sleptons had flavor-mixing mass terms. If
both Higgs-mediated and ordinary SUSY contribution are significant, the ratio
of branching ratios \BR(\meg) / \BR(\maleal) becomes sensitive to SUSY mass
parameters. We investigated these mass-sensitive regions and the behavior of
the ratio \BR(\meg) / \BR(\maleal) in some mass spectrum of the NUHM, and
found that this ratio drastically depends on the mass spectrum structure and
chirality of flavor violation. Log factor from two split mass scale influences
the way of interference between gaugino- and Higgs-mediated contributions
significantly.Comment: 19 pages, 8 figures, it will appear in PR
Destruction of Long-range Order by Quenching the Hopping Range in One Dimension
We study the dynamics in a one dimensional hard-core Bose gas with power-law
hopping after an abrupt reduction of the hopping range using the time-dependent
density-matrix renormalization group (t-DMRG) and bosonization techniques. In
particular, we focus on the destruction of the Bose-Einstein condensate (BEC),
which is present in the initial state in the thermodynamic limit. We argue that
this type of quench is akin to a sudden reduction in the effective
dimensionality of the system (from to ). We identify two
regimes in the evolution of the BEC fraction. For short times the decay of the
BEC fraction is Gaussian while for intermediate to long times, it is well
described by a stretched exponential with an exponent that depends on the
initial effective dimensionality of the system. These results are potentially
relevant for cold trapped-ion experiments which can simulate an equivalent of
hard-core bosons, i.e. spins, with tunable long-range interactions.Comment: 8 pages, 7 figures, accepted for publication in Phys. Rev.
Effects of Freezing on Soil Temperature, Freezing Front Propagation and Moisture Redistribution in Peat: Laboratory Investigations
There are not many studies that report water movement in freezing peat. Soil column studies under controlled laboratory settings can help isolate and understand the effects of different factors controlling freezing of the active layer in organic covered permafrost terrain. In this study, four peat Mesocosms were subjected to temperature gradients by bringing the Mesocosm tops in contact with subzero air temperature while maintaining a continuously frozen layer at the bottom (proxy permafrost). Soil water movement towards the freezing front (from warmer to colder regions) was inferred from soil freezing curves, liquid water content time series and from the total water content of frozen core samples collected at the end of freezing cycle. A substantial amount of water, enough to raise the upper surface of frozen saturated soil within 15 cm of the soil surface at the end of freezing period appeared to have moved upwards during freezing. Diffusion under moisture gradients and effects of temperature on soil matric potential, at least in the initial period, appear to drive such movement as seen from analysis of freezing curves. Freezing front (separation front between soil zones containing and free of ice) propagation is controlled by latent heat for a long time during freezing. A simple conceptual model describing freezing of an organic active layer initially resembling a variable moisture landscape is proposed based upon the results of this study. The results of this study will help in understanding, and ultimately forecasting, the hydrologic response of wetland-dominated terrain underlain by discontinuous permafrost
Magnon bands of N-leg integer-spin antiferromagnetic systems in the weak interchain-coupling regime
Using the exact results of the O(3) nonlinear sigma model (NLSM) and a few
quantitative numerical data for integer-spin antiferromagnetic (AF) chains, we
systematically estimate all magnon excitation energies of N-leg integer-spin AF
ladders and tubes in the weak-interchain-coupling regime. Our method is based
on a first-order perturbation theory for the strength of the interchain
coupling. It can deal with any kind of interchain interactions, in principle.
We confirm that results of the perturbation theory are in good agreement with
those of a quantum Monte Carlo simulation and with our recent study based on a
saddle-point approximation of the NLSM [Phys. Rev. B 72, 104438 (2005)]. Our
theory further supports the existence of a Haldane (gapped) phase even in a
d-dimensional (d\geq 2) spatially anisotropic integer-spin AF model, if the
exchange coupling in one direction is sufficiently strong compared with those
in all the other directions. The strategy in this paper is applicable to other
N-leg systems consisting of gapped chains which low-energy physics is exactly
or quantitatively known.Comment: 11 pages, 4 figures, Revtex, published version, see also
cond-mat/0506049 (PRB72, 104438 (2005)
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