Brehm, S., Arrigoni, E., Aichhorn, M., Hanke, W.
Characteristic features of the magnetic excitations in high-Tc cuprate superconductors are shown to be reproduced within a two-dimensional Hubbard model in the relevant strong-coupling regime. In...
Hochkeppel, S., Assaad, F. F., Hanke, W.
We investigate the charge- and spin dynamical structure factors for the 2D one-band Hubbard model in the strong coupling regime within an extension of the Dynamical Cluster Approximation (DCA) to...
Aichhorn, M., Arrigoni, E., Potthoff, M., Hanke, W.
Cooperation and competition between the antiferromagnetic, d-wave superconducting and Mott-insulating states are explored for the two-dimensional Hubbard model including nearest and...
Electronic structure of zinc-blende MnTe within the GW approximation (2007)
Fleszar, A., Potthoff, M., Hanke, W.
Using the local spin-density approximation (LSDA) and the (non self-consistent) GW approach, the (quasi-particle) band structure is calculated for MnTe in zinc-blende geometry. Different parameters...
Aichhorn, M., Arrigoni, E., Huang, Z. B., Hanke, W.
Recent excperiments (ARPES, Raman) suggest the presence of two distinct energy gaps in high-Tc superconductors (HTSC), exhibiting different doping dependences. Results of a variational cluster...
A. Fleszar, W. Hanke, W. Weigand, C. Kumpf, C. Heske, ...
Journal article
Aichhorn, M., Arrigoni, E., Potthoff, M., Hanke, W.
Using the variational cluster approach (VCA), we study the transition from the antiferromagnetic to the superconducting phase of the two-dimensional Hubbard model at zero temperature. Our...
Renormalization of the electron-spin-fluctuation interaction in the t-t'-U Hubbard model (2006)
Huang, Z. B., Hanke, W., Arrigoni, E., Chubukov, A. V.
We study the renormalization of the electron-spin-fluctuation (el-sp) vertex in a two-dimensional Hubbard model with nearest-neighbor (t) and next-nearest-neighbor (t') hopping by a...
Hazel, P. Van Den, Zuurbier, M., Babisch, W., Bartonova, A., Bistrup, M.L., Bolte, G., ...
Background: Facts and hypotheses on the relationship between some children's diseases or disorders and external stressors during the developmental stage of a child, both prenatally and postnatally...
Environmental tobacco smoke exposure and children's health (2006)
Polanska, K., Hanke, W., Ronchetti, R., Hazel, P. Van Den, Zuurbier, M., Koppe, J.G., ...
Almost half of the child population is involuntarily exposed to environmental tobacco smoke (ETS). The ETS exposure gives rise to an excessive risk of several diseases in infancy and childhood,...
Air pollution: A threat to the health of our children (2006)
Moshammer, H., Bartonova, A., Hanke, W., Hazel, P. Van Den, Koppe, J.G., Kraemer, U., ...
Background/methods: Current air pollution levels pose a threat to the health of children starting from conception. The scientific evidence is presented for mortality, morbidity, and sub-clinical...
Aichhorn, M., Arrigoni, E., Potthoff, M., Hanke, W.
The competition between d-wave superconductivity (SC) and antiferromagnetism (AF) in the high-Tc cuprates is investigated by studying the hole- and electron-doped two-dimensional Hubbard model with a...
Correlated band structure of electron-doped cuprate materials (2005)
Dahnken, C., Potthoff, M., Arrigoni, E., Hanke, W.
We present a numerical study of the doping dependence of the spectral function of the n-type cuprates. Using a variational cluster-perturbation theory approach based upon the self-energy-functional...
Role of vertex corrections in the spin-fluctuation mediated pairing mechanism (2004)
Huang, Z. B., Hanke, W., Arrigoni, E.
We study numerically and partly diagrammatically the renormalization of the electron-spin interaction or vertex in a two-dimensional one-band Hubbard model with spin-fluctuation momentum transfer...
Change of quasiparticle dispersion in crossing T_c in the underdoped cuprates (2004)
Eckl, T., Hanke, W., Borisenko, S. V., Kordyuk, A. A., Kim, T., Koitzsch, A., ...
One of the most remarkable properties of the high-temperature superconductors is a pseudogap regime appearing in the underdoped cuprates above the superconducting transition temperature T_c. The...
On the nature of the magnetic transition in a Mott insulator (2004)
Fleck, M., Lichtenstein, A. I., Zacher, M. G., Hanke, W., Oleś, A. M.
Using a combination of exact enumeration and the dynamical mean-field theory (DMFT) we study the drastic change of the spectral properties, obtained in the half-filled two-dimensional Hubbard model...
Dahnken, C., Aichhorn, M., Hanke, W., Arrigoni, E., Potthoff, M.
Based on the self-energy-functional approach proposed recently [M. Potthoff, Eur. Phys. J. B 32, 429 (2003)], we present an extension of the cluster-perturbation theory to systems with spontaneously...
Asymmetric electron-phonon interactions in the three-band Peierls-Hubbard model (2003)
Huang, Z. B., Hanke, W., Arrigoni, E.
Using the Quantum Monte Carlo (QMC) technique within frozen-phonon, we studied the effects of the half-breathing O$(\pi,0)$ phonon mode on the ground-state properties of the three-band...
Electron-phonon vertex in the two-dimensional one-band Hubbard model (2003)
Huang, Z. B., Hanke, W., Arrigoni, E., Scalapino, D. J.
Using quantum Monte Carlo techniques, we study the effects of electronic correlations on the effective electron-phonon (el-ph) coupling in a two-dimensional one-band Hubbard model. We consider a...
Scaling properties of the projected SO(5) model in three dimensions (2002)
Jöstingmeier, M., Dorneich, A., Arrigoni, E., Hanke, W., Zhang, Shou-Cheng
We study the scaling properties of the quantum ``projected'' SO(5) model in three dimensions by means of a highly accurate Quantum-Monte-Carlo analysis. Within the parameter regime studied...
Phase-fluctuation induced reduction of the kinetic energy at the superconducting transition (2002)
Eckl, T., Hanke, W., Arrigoni, E.
Recent reflectivity measurements provide evidence for a "violation" of the in-plane optical integral in the underdoped high-T_c compound Bi_2Sr_2CaCu_2O_{8+\delta} up to frequencies much higher than...
A Bosonic Model for High-Temperature Superconductivity and Antiferromagnetism (2002)
Shoucheng Zhang, Horst Rollnik, Dietrich Wolf (editors, A. Dorneich, E. Arrigoni, W. Hanke, ...
Gutzwiller projection" in order to resolve several inconsistencies with experimental results on high-Tc superconductors. Here, we present a numerical study of an effective bosonic model which...
Spectral Properties of High-T$_c$ Cuprates via a Cluster-Perturbation Approach (2001)
Dahnken, C., Arrigoni, E., Hanke, W.
Angular-resolved photoemission data on half-filled doped cuprate materials are compared with an exact-diagonalization analysis of the three-band Hubbard model, which is extended to the infinite...
Pair Phase Fluctuations and the Pseudogap (2001)
Eckl, T., Scalapino, D. J., Arrigoni, E., Hanke, W.
The single-particle density of states and the tunneling conductance are studied for a two-dimensional BCS-like Hamiltonian with a d_{x^2-y^2}-gap and phase fluctuations. The latter are treated by a...
Dorneich, A., Hanke, W., Arrigoni, E., Troyer, M., Zhang, S. C.
We present numerical studies of a quantum ``projected'' SO(5) model which aims at a unifying description of antiferromagnetism and superconductivity in the high-T$_c$ cuprates, while properly taking...
Interrelation between antiferromagnetic and superconducting gaps in high-Tc materials (2001)
Arrigoni, E., Zacher, M. G., Eckl, T., Hanke, W.
We propose a phenomenological model, comprising a microscopic \sof model plus the on-site Hubbard interaction $U$ (``projected \sof model'') to understand the interrelation between the d-wave-gap...
Gröber, C., Evertz, H. G., Hanke, W.
By combining fermion Quantum Monte Carlo (QMC) simulations with diagrammatic theory, we have calculated the dielectric screening and the screened potential, in a quasi 2D Hubbard model for cuprate...
Stripes and superconducting pairing in the t-J model with Coulomb interactions (2000)
Arrigoni, E., Harju, A. P., Hanke, W., Brendel, B., Kivelson, S. A.
We study the competition between long- and short-range interactions among charge carriers in strongly-correlated electronic systems employing a new method which combines the density-matrix...
J. J. Deisz, R. Preuss, W. Hanke
. Dynamical spectra for Hubbard lattices and simple atoms are obtained using ground state projection (zero-temperature) quantum Monte Carlo and the maximum entropy method. For Hubbard lattices we...
The Metal-Insulator Transition in the Hubbard Model (2000)
M. G. Zacher, A. Dorneich, R. Eder, W. Hanke
. The Mott{Hubbard metal{insulator transition is studied in the two{ dimensional Hubbard Model with and without next{nearest neighbor hopping at half{lling by a combination of Quantum{Monte{Carlo and...
Critical properties of projected SO(5) models at finite temperatures (2000)
We consider the projected SO(5) bosonic model introduced in order to connect the SO(5) theory of high-T$_c$ superconductivity with the physics of the Mott-insulating gap, and derive the corresponding...
Anomalous low doping phase of the Hubbard model (2000)
Groeber, C., Eder, R., Hanke, W.
We present results of a systematic Quantum-Monte-Carlo study for the single-band Hubbard model. Thereby we evaluated single-particle spectra (PES & IPES), two-particle spectra (spin & density...
Consistent Application of Maximum Entropy to (2000)
Bayesian probability theory along with the maximum entropy concept is widely used for inferential problems, particularly to infer dynamic properties of strongly correlated fermion systems from...
Continuous Evolution of the 2D Hubbard Model from an Insulator to a Metal (2000)
We present Quantum-Monte-Carlo results for the momentum and frequency dependent spectral weight A( ~ k; !) showing the evolution from insulating to metallic behavior in the two-dimensional Hubbard...
W. Hanke, R. Eder, E. Arrigoni, A. Dorneich, M. G. Zacher
We review numerical and analytical results supporting SO(5) symmetry as a concept unifying superconductivity and antiferromagnetism in the hightemperature superconductors. Mean field calculations on...
Dynamical properties of two doped, coupled Hubbard chains (1998)
Noack, R. M., Zacher, M. G., Endres, H., Hanke, W.
Using quantum Monte Carlo (QMC) simulations combined with Maximum Entropy analytic continuation as well as analytical methods, we examine the one- and two-particle dynamical properties of the Hubbard...
Magnetic fluctuations in coupled inequivalent Hubbard layers as a model for Y2Ba4Cu7O15 (1998)
Hildebrand, G., Arrigoni, E., Schmalian, J., Hanke, W.
We investigate, within the fluctuation-exchange approximation, a correlated-electron model for Y2Ba4Cu7O15 represented by two inequivalent Hubbard layers coupled by an interlayer hopping $t_\perp$....
SO(5) Symmetry in t-J and Hubbard Models (1998)
Hanke, W., Eder, R., Arrigoni, E., Dorneich, A., Meixner, S., Zacher, M. G.
Numerical and analytical results are reviewed, which support SO(5) symmetry as a concept unifying superconductivity and antiferromagnetism in the high-temperature superconductors. Exact cluster...
Interplane magnetic coupling effects in the multilattice compound Y_2Ba_4Cu_7O_{15} (1998)
Hildebrand, G., Arrigoni, E., Schmalian, J., Hanke, W.
We investigate the interplane magnetic coupling of the multilattice compound Y_2Ba_4Cu_7O_{15} by means of a bilayer Hubbard model with inequivalent planes. We evaluate the spin response, effective...
Overscreening in Hubbard electron systems (1998)
Gröber, C., Evertz, H. G., Hanke, W.
We show that doping-induced charge fluctuations in strongly correlated Hubbard electron systems near the 1/2-filled, insulating limit cause overscreening of the electron-electron Coulomb repulsion....
Dynamics of an SO(5) symmetric ladder model (1998)
Eder, R., Dorneich, A., Zacher, M. G., Hanke, W., Zhang, Shou-Cheng
We discuss properties of an exactly SO(5) symmetric ladder model. In the strong coupling limit we demonstrate how the SO(3)-symmetric description of spin ladders in terms of bond Bosons can be...
Transport Properties of One-Dimensional Hubbard Models (1998)
Kirchner, S., Evertz, H. G., Hanke, W.
We present results for the zero and finite temperature Drude weight D(T) and for the Meissner fraction of the attractive and the repulsive Hubbard model, as well as for the model with next nearest...
Hildebrand, G., Arrigoni, E., Gröber, C., Hanke, W.
We analyze single-particle electronic and two-particle magnetic properties of the Hubbard model in the underdoped and optimally-doped regime of \YBCO by means of a modified version of the...
The band structure of BeTe - a combined experimental and theoretical study (1997)
Nagelstra\ss{}er, M., Dröge, H., Litz, T., Waag, A., Fleszar, G. Landwehr A., ...
Using angle-resolved synchrotron-radiation photoemission spectroscopy we have determined the dispersion of the valence bands of BeTe(100) along $\Gamma X$, i.e. the [100] direction. The measurements...
Renormalized SO(5) symmetry in ladders with next-nearest-neighbor hopping (1997)
We study the occurrence of SO(5) symmetry in the low-energy sector of two-chain Hubbard-like systems by analyzing the flow of the running couplings ($g$-ology) under renormalization group in the...
An SO(5) Symmetric Ladder (1997)
Scalapino, D., Zhang, Shou-Cheng, Hanke, W.
We construct an SO(5) symmetric electron model on a two-chain ladder with purely local interactions on a rung. The ground state phase diagram of this model is determined in the strong-coupling limit....
Systematic numerical study of spin-charge separation in one dimension (1997)
Zacher, M. G., Arrigoni, E., Hanke, W., Schrieffer, J. R.
The problem of spin-charge separation is analyzed numerically in the metallic phase of the one-band Hubbard model in one dimension by studying the behavior of the single-particle Green's function and...
Electron transport in coupled chains of interacting fermions with impurities (1997)
Arrigoni, E., Brendel, B., Hanke, W.
We study the low-temperature transport of a doped two-chain ladder system of interacting fermions in the presence of a barrier or of a low concentration of impurities. Above a certain value of the...
A microscopic model for the intrinsic Josephson tunneling in high-T_C superconductors (1997)
Schmitt, O., Endres, H., Hanke, W., Kleiner, R., Mueller, P.
A quantitative analysis of a microscopic model for the intrinsic Josephson effect in high-temperature superconductors based on interlayer tunneling is presented. The pairing correlations in the...
From Antiferromagnetism to Superconductivity: Numerical Evidence for SO(5) Symmetry (1997)
Eder, R., Hanke, W., Zhang, S. C.
In this work, we present numerical results which support SO(5) symmetry as a concept unifying superconductivity and antiferromagnetism in the high-temperature superconductors. Using exact cluster...
Effects of Electronic Correlations on the Thermoelectric Power of the Cuprates (1997)
Hildebrand, G., Hagenaars, T. J., Hanke, W., Grabowski, S., Schmalian, J.
We show that important anomalous features of the normal-state thermoelectric power S of high-Tc materials can be understood as being caused by doping dependent short-range antiferromagnetic...
Friedel oscillations induced by non-magnetic impurities in the two-dimensional Hubbard model (1997)
Ziegler, W., Endres, H., Hanke, W.
We study the interplay of correlations and disorder using an unrestricted Slave-Boson technique in real space. Within the saddle-point approximation, we find Friedel oscillations of the charge...
Vortex-line liquid phases: Longitudinal superconductivity in the lattice London model (1997)
Hagenaars, T. J., Brandt, E. H., Hetzel, R. E., Hanke, W., Leghissa, M., Saemann-Ischenko, G.
We study the vortex-line lattice and liquid phases of a clean type-II superconductor by means of Monte Carlo simulations of the lattice London model. Motivated by a recent controversy regarding the...
Pseudogaps and their Interplay with Magnetic Excitations in the doped 2D Hubbard Model (1997)
Preuss, R., Hanke, W., Gröber, C., Evertz, H. G.
On the basis of Quantum Monte Carlo simulations of the two-dimensional Hubbard model which cover the doping range from the under- to the over-doped regime, we find that the single-particle spectral...
Endres, H., Hanke, W., Evertz, H. G., Assaad, F. F.
In a recent Letter, Kuroki and Aoki [Phys. Rev. Lett. 76, 440 (1996)] presented quantum Monte-Carlo (QMC) results for pairing correlations in the three-band Hubbard model, which describes the...
One particle interchain hopping in coupled Hubbard chains (1996)
Poilblanc, D., Endres, H., Mila, F., Zacher, M. G., Capponi, S., Hanke, W.
Interchain hopping in systems of coupled chains of correlated electrons is investigated by exact diagonalizations and Quantum-Monte-Carlo methods. For two weakly coupled Hubbard chains at...
Multimode electron-phonon interactions in the 2-dimensional t-J-Holstein model (1995)
Poilblanc, D., Sakai, T., Scalapino, D. J., Hanke, W.
Polaronic effects are investigated in the two dimensional t--J model (describing Cu spins and holes of the planes in high-$T_c$ cuprates) in the presence of in-plane dynamic oxygen breathing modes....
T-Matrix Formulation of Impurity Scattering in Correlated Systems (1995)
Ziegler, W., Poilblanc, D., Preuss, R., Hanke, W., Scalapino, D. J.
Using a generalized T-matrix description which, in principle, exactly includes Coulomb correlations and potential scattering events, resonant and bound impurity states are discussed. Like in the...
Dynamical Properties of Two Coupled Hubbard Chains at Half-filling (1995)
Endres, H., Noack, R. M., Hanke, W., Poilblanc, D., Scalapino, D. J.
Using grand canonical Quantum Monte Carlo (QMC) simulations combined with Maximum Entropy analytic continuation, as well as analytical methods, we examine the one- and two-particle dynamical...
Evidence for a superfluid density in t--J ladders (1995)
Hayward, C. A., Poilblanc, D., Noack, M., Scalapino, D. J., Hanke, W.
Applying three independent techniques, we give numerical evidence for a finite superfluid density in isotropic hole-doped t--J ladders: We show the existence of anomalous flux quantization,...
Consistent Application of Maximum Entropy to Quantum-Monte-Carlo Data (1995)
Bayesian statistics in the frame of the maximum entropy concept has widely been used for inferential problems, particularly, to infer dynamic properties of strongly correlated fermion systems from...
Consistent Application of Maximum Entropy to Quantum-Monte-Carlo Data (1995)
Bayesian statistics in the frame of the maximum entropy concept has widely been used for inferential problems, particularly, to infer dynamic properties of strongly correlated fermion systems from...
Evaluation of Dynamical Spectra for Zero-Temperature (1995)
J. J. Deisz, R. Preuss, W. Hanke
Dynamical spectra for Hubbard lattices and simple atoms are obtained using ground state projection (zero-temperature) quantum Monte Carlo and the maximum entropy method. For Hubbard lattices we show...
SPIN AND CHARGE MODES OF THE t-J LADDER (1995)
Poilblanc, D., Scalapino, D. J., Hanke, W.
The spin and charge excitations of the t--J ladder are studied by exact diagonalization techniques for several electron densities. The various modes are classified according to their spin (singlet or...
Quasiparticle Dispersion of the 2D Hubbard Model: From an Insulator to a Metal (1994)
On the basis of Quantum-Monte-Carlo results the evolution of the spectral weight $A(\vec k, \omega)$ of the two-dimensional Hubbard model is studied from insulating to metallic behavior. As observed...
Conserving approximation for the three-band Hubbard model: flat quasiparticle dispersion (1994)
Putz, R., Preuss, R., Muramatsu, A., Hanke, W.
It is shown that the low-energy single-particle excitation-spectrum of the three-band Hubbard model at hole-dopings away from half-filling agrees remarkably well with Quantum Monte Carlo data and...