1,080 research outputs found
Anisotropy on the Fermi Surface of the Two-Dimensional Hubbard Model
We investigate anisotropic charge fluctuations in the two-dimensional Hubbard
model at half filling. By the quantum Monte Carlo method, we calculate a
momentum-resolved charge compressibility , which shows effects of an infinitesimal doping. At the temperature
, shows peak structure at the points along the line. A similar peak
structure is reproduced in the mean-filed calculation for the d-wave pairing
state or the staggered flux state.Comment: 5 pages, 3 figures, figures and presentation are modifie
Quantum Monte Carlo study of a nonmagnetic impurity in the two-dimensional Hubbard model
In order to investigate the effects of nonmagnetic impurities in strongly
correlated systems, Quantum Monte Carlo (QMC) simulations have been carried out
for the doped two-dimensional Hubbard model with one nonmagnetic impurity.
Using a bare impurity potential which is onsite and attractive, magnetic and
single-particle properties have been calculated. The QMC results show that
giant oscillations develop in the Knight shift response around the impurity
site due to the short-range antiferromagnetic correlations. These results are
useful for interpreting the NMR data on Li and Zn substituted layered cuprates.Comment: 10 pages, 7 figure
Theory of spin and charge fluctuations in the Hubbard model
A self-consistent theory of both spin and charge fluctuations in the Hubbard
model is presented. It is in quantitative agreement with Monte Carlo data at
least up to intermediate coupling . It includes both
short-wavelength quantum renormalization effects, and long-wavelength thermal
fluctuations which can destroy long-range order in two dimensions. This last
effect leads to a small energy scale, as often observed in high temperature
superconductors. The theory is conserving, satisfies the Pauli principle and
includes three-particle correlations necessary to account for the incipient
Mott transition.Comment: J1K 2R1 10 pages, Revtex 3.0, 4 uuencoded postscript figures, report#
CRPS-93-4
Competition between spin exchange and correlated hopping
The ground-state phase diagram is numerically studied for an electronic model
consisting of the spin exchange term (J) and the correlated hopping term (t_3:
the three-site term). This model has no single-particle hopping and the ratio
of the two terms is controlled by a parameter \alpha \equiv 4 t_3 / J. The case
of \alpha=1 corresponds to complete suppression of single-particle hopping in
the strong-coupling limit of the Hubbard model. In one dimension, phase
separation takes place below a critical value \alpha_c = 0.36-0.63 which
depends on the electron density. Spin gap opens in the whole region except the
phase-separated one. For \alpha \gsim 1.2 and low hole densities,
charge-density-wave correlations are the most dominant, whereas singlet-pairing
correlations are the most dominant in the remaining region. The possibility of
superconductivity in the two-dimensional case is also discussed, based on
equal-time pairing correlations.Comment: 4 pages including 5 figures. Proceedings of ISSP-Kashiwa 2001
(submitted to J. Phys. Chem. Solids
A Proposal for Robpca Algorithm
Principal component Analysis (PCA) is one of the most frequently used multivariate statistical methods. Especially, it is used on the purpose of dimension reduction and obtaining uncorrelated variables. However, classic PCA (CPCA) is sensitive to outlier. Because it is based on classic covariance or correlation matrices influenced by outliers
Understanding the Potential In Vitro Modes of Action of Bis(beta-diketonato) Oxovanadium(IV) Complexes
To understand the potential in vitro modes of action of bis(β-diketonato) oxovanadium(IV) complexes, nine compounds of varying functionality have been screened using a range of biological techniques. The antiproliferative activity against a range of cancerous and normal cell lines has been determined, and show these complexes are particularly sensitive against the lung carcinoma cell line, A549. Annexin V (apoptosis) and Caspase-3/7 assays were studied to confirm these complexes induce programmed cell death. While gel electrophoresis was used to determine DNA cleavage activity and production of reactive oxygen species (ROS), the Comet assay was used to determine induced genomic DNA damage. Additionally, Förster resonance energy transfer (FRET)-based DNA melting and fluorescent intercalation displacement assays have been used to determine the interaction of the complexes with double strand (DS) DNA and to establish preferential DNA base-pair binding (AT versus GC)
Quasi-particle Lifetimes in a d_{x^2-y^2} Superconductor
We consider the lifetime of quasi-particles in a d-wave superconductor due to
scattering from antiferromagnetic spin-fluctuations, and explicitly separate
the contribution from Umklapp processes which determines the electrical
conductivity. Results for the temperature dependence of the total scattering
rate and the Umklapp scattering rate are compared with relaxation rates
obtained from thermal and microwave conductivity measurements, respectively.Comment: 14 pages, 4 figure
Quasiparticle Dispersion of the 2D Hubbard Model: From an Insulator to a Metal
On the basis of Quantum-Monte-Carlo results the evolution of the spectral
weight of the two-dimensional Hubbard model is studied from
insulating to metallic behavior. As observed in recent photoemission
experiments for cuprates, the electronic excitations display essentially
doping-independent features: a quasiparticle-like dispersive narrow band of
width of the order of the exchange interaction and a broad valence- and
conduction-band background. The continuous evolution is traced back to one and
the same many-body origin: the doping-dependent antiferromagnetic spin-spin
correlation.Comment: 11 pages, REVtex, 4 figures (in uuencoded postscript format
Kink Structure in the Quasiparticle Band of Doped Hubbard Systems
By making use of the self-consistent projection operator method with
high-momentum and high-energy resolutions, we find a kink structure in the
quasiparticle excitation spectrum of the two-dimensional Hubbard model in the
underdoped regime. The kink is caused by a mixing between the quasiparticle
state and excitations with short-range antiferromagnetic order. We suggest that
this might be the origin of the strong concentration dependence of the 'kink'
found in La_{2-x}Sr_{x}CuO_{4} (x=0.03-0.07).Comment: 3 pages, 4 figures. to be published in J. Phys. Soc. Jpn., Vol. 74,
No. 9, September 15, 200
Non-magnetic impurities in two- and three- dimensional Heisenberg antiferromagnets
In this paper we study in a large-S expansion effects of substituting spins
by non-magnetic impurities in two- and three- dimensional Heisenberg
antiferromagnets in a weak magnetic field. In particular, we demonstrate a
novel mechanism where magnetic moments are induced around non-magnetic
impurities when magnetic field is present. As a result, Curie-type behaviour in
magnetic susceptibility can be observed well below the Neel temperature, in
agreement with what is being observed in and
compounds.Comment: Latex fil
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