Th. Pruschke
YOU?
Author Swipe
View article: Quantum phases of Bose–Fermi mixtures in optical lattices
Quantum phases of Bose–Fermi mixtures in optical lattices Open
We consider a mixture of interacting bosons and fermions in optical lattices described by the Bose–Fermi Hubbard Hamiltonian. To treat bosonic degrees of freedom, we use a generalized dynamical mean field theory (GDMFT). By combining the G…
View article: Many-particle effects in adsorbed magnetic atoms with easy-axis anisotropy: the case of Fe on the CuN/Cu(100) surface
Many-particle effects in adsorbed magnetic atoms with easy-axis anisotropy: the case of Fe on the CuN/Cu(100) surface Open
We study the effects of the exchange interaction between an adsorbed magnetic atom with easy-axis magnetic anisotropy and the conduction-band electrons from the substrate. We model the system using an anisotropic Kondo model and we compute…
View article: Appearance of “Fragile” Fermi Liquids in Finite-Width Mott Insulators Sandwiched between Metallic Leads
Appearance of “Fragile” Fermi Liquids in Finite-Width Mott Insulators Sandwiched between Metallic Leads Open
Using inhomogeneous dynamical mean-field theory, we show that the normal-metal proximity effect could force any finite number of Mott-insulating "barrier" planes sandwiched between semi-infinite metallic leads to become "fragile" Fermi liq…
View article: Splitting of the Kondo resonance in anisotropic magnetic impurities on surfaces
Splitting of the Kondo resonance in anisotropic magnetic impurities on surfaces Open
Using the numerical renormalization group method, we study the splitting of the Kondo resonance by a magnetic field applied in different directions in the Kondo model for anisotropic magnetic impurities. Several types of magnetic anisotrop…
View article: Theoretical description of time‐resolved pump/probe photoemission in TaS<sub>2</sub>: a single‐band DFT+DMFT(NRG) study within the quasiequilibrium approximation
Theoretical description of time‐resolved pump/probe photoemission in TaS<sub>2</sub>: a single‐band DFT+DMFT(NRG) study within the quasiequilibrium approximation Open
In this work, we theoretically examine recent pump/probe photoemission experiments on the strongly correlated charge‐density‐wave insulator TaS 2 .We describe the general nonequilibrium many‐body formulation of time‐resolved photoemission …
View article: Theoretical Description of Time-Resolved Photoemission Spectroscopy: Application to Pump-Probe Experiments
Theoretical Description of Time-Resolved Photoemission Spectroscopy: Application to Pump-Probe Experiments Open
The theory for time-resolved, pump-probe, photoemission spectroscopy and other pump-probe experiments is developed. The formal development is completely general, incorporating all of the nonequilibrium effects of the pump pulse and the fin…
View article: Properties of anisotropic magnetic impurities on surfaces
Properties of anisotropic magnetic impurities on surfaces Open
Using numerical renormalization group techniques, we study static and dynamic properties of a family of single-channel Kondo impurity models with axial magnetic anisotropy $DS_z^2$ terms; such models are appropriate to describe magnetic im…
View article: Steady-State Nonequilibrium Density of States of Driven Strongly Correlated Lattice Models in Infinite Dimensions
Steady-State Nonequilibrium Density of States of Driven Strongly Correlated Lattice Models in Infinite Dimensions Open
An exact formalism for calculating the retarded and advanced Green's functions of strongly correlated lattice models in a uniform electric field is derived within dynamical mean-field theory. To illustrate the method, we solve for the none…
View article: Suppression of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>d</mml:mi></mml:math>-wave superconductivity in the checkerboard Hubbard model
Suppression of-wave superconductivity in the checkerboard Hubbard model Open
Using a dynamical cluster quantum Monte Carlo approximation we investigate the d-wave superconducting transition temperature $T_c$ in the doped 2D repulsive Hubbard model with a weak inhomogeneity. The inhomogeneity is introduced in the ho…
View article: Kinks in the dispersion of strongly correlated electrons
Kinks in the dispersion of strongly correlated electrons Open
The properties of condensed matter are determined by single-particle and collective excitations and their mutual interactions. These quantum-mechanical excitations are characterized by an energy, E, and a momentum, hk, which are related th…
View article: Functional renormalization group for nonequilibrium quantum many-body problems
Functional renormalization group for nonequilibrium quantum many-body problems Open
We extend the concept of the functional renormalization for quantum many-body\nproblems to non-equilibrium situations. Using a suitable generating functional\nbased on the Keldysh approach, we derive a system of coupled differential\nequat…
View article: Evidence for strong electronic correlations in the spectra of Sr$_2$RuO$_4$
Evidence for strong electronic correlations in the spectra of Sr$_2$RuO$_4$ Open
The importance of electronic correlation effects in the layered perovskite Sr$_2$RuO$_4$ is evidenced. To this end we use state-of-the-art LDA+DMFT (Local Density Approximation + Dynamical Mean-Field Theory) in the basis of Wannier functio…
View article: Pseudogaps in strongly correlated metals: A generalized dynamical mean-field theory approach
Pseudogaps in strongly correlated metals: A generalized dynamical mean-field theory approach Open
We generalize the dynamical-mean field (DMFT) approximation by including into\nthe DMFT equations some length scale via a momentum dependent ``external''\nself-energy S(k). This external self-energy describes non-local dynamical\ncorrelati…
View article: Publisher's Note: Efficient calculation of the antiferromagnetic phase diagram of the three-dimensional Hubbard model [Phys. Rev. B<b>72</b>, 060411 (2005)]
Publisher's Note: Efficient calculation of the antiferromagnetic phase diagram of the three-dimensional Hubbard model [Phys. Rev. B<b>72</b>, 060411 (2005)] Open
Received 13 September 2005DOI:https://doi.org/10.1103/PhysRevB.72.109902©2005 American Physical Society
View article: Pseudogaps in Strongly Correlated Metals
Pseudogaps in Strongly Correlated Metals Open
We generalize the dynamical-mean field (DMFT) approximation by including into the DMFT equations some length scale via a (momentum dependent) ``external'' self-energy Σ_k. This external self-energy describes non-local dynamical correlation…
View article: A functional renormalization group approach to zero-dimensional interacting systems
A functional renormalization group approach to zero-dimensional interacting systems Open
We apply the functional renormalization group method to the calculation of\ndynamical properties of zero-dimensional interacting quantum systems. As case\nstudies we discuss the anharmonic oscillator and the single impurity Anderson\nmodel…
View article: Phase Diagram of the Frustrated Hubbard Model
Phase Diagram of the Frustrated Hubbard Model Open
The Mott-Hubbard metal-insulator transition in the paramagnetic phase of the\none-band Hubbard model has long been used to describe similar features in real\nmaterials like V$_2$O$_3$. Here we show that this transition is hidden inside a\n…
View article: Single-Ion Non-Fermi Liquid Behavior in Ce_(1-x)La_xNi_9Ge_4
Single-Ion Non-Fermi Liquid Behavior in Ce_(1-x)La_xNi_9Ge_4 Open
We report on specific heat, magnetic susceptibility and resistivity measurements on the compound Ce_(1-x)La_xNi_9Ge_4 for various concentrations ranging from the stoichiometric system with x=0 to the dilute limit x=0.95. Our data reveal si…
View article: From Slater to Mott–Heisenberg physics: the antiferromagnetic phase of the Hubbard model
From Slater to Mott–Heisenberg physics: the antiferromagnetic phase of the Hubbard model Open
We study the optical conductivity of the one-band Hubbard model in the N\\'eel\nstate at half filling at T=0 using the dynamical mean-field theory. For small\nvalues of the Coulomb parameter clear signatures of a Slater insulator expected\…
View article: Semianalytical solution of the Kondo model in a magnetic field
Semianalytical solution of the Kondo model in a magnetic field Open
The single impurity Kondo model at zero temperature in a magnetic field is\nsolved by a semi-analytical approach based on the flow equation method. The\nresulting problem is shown to be equivalent to a resonant level model with a\nnon-cons…
View article: Nonresonant inelastic light scattering in the Hubbard model
Nonresonant inelastic light scattering in the Hubbard model Open
Inelastic light scattering from electrons is a symmetry-selective probe of the charge dynamics within correlated materials. Many measurements have been made on correlated insulators, and recent exact solutions in large dimensions explain a…
View article: Explanation of the similarity of the experimental photoemission spectra of SrVO3 and CaVO3
Explanation of the similarity of the experimental photoemission spectra of SrVO3 and CaVO3 Open
We present parameter-free LDA+DMFT results for the many-particle density of states of cubic SrVO3 and orthorhombic CaVO3. Both systems are found to be strongly correlated metals, but em not on the verge of a metal-insulator transition. In …
View article: Angle-resolved photoemission spectra of the Hubbard model
Angle-resolved photoemission spectra of the Hubbard model Open
We discuss spectra calculated for the 2D Hubbard model in the intermediate coupling regime with the dynamical cluster approximation, which is a non-perturbative approach. We find a crossover from a normal Fermi liquid with a Fermi surface …
View article: Spectral and Magnetic Properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math>- and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>γ</mml:mi></mml:math>-Ce from Dynamical Mean-Field Theory and Local Density Approximation
Spectral and Magnetic Properties of- and-Ce from Dynamical Mean-Field Theory and Local Density Approximation Open
We present excitation spectra for Ce metal obtained with an ab initio scheme combining local density approximation and dynamical mean-field theory including itinerant spd and correlated f states. The local interactions among the f electron…
View article: On the analyticity of solutions in the dynamical mean-field theory
On the analyticity of solutions in the dynamical mean-field theory Open
The unphysical solutions of the periodic Anderson model obtained by Keiter and Leuders (Keiter H and Leuders T 2000 Europhys. Lett. 49 801) in dynamical mean-field theory (DMFT) are shown to result from the authors' restricted choice of th…
View article: <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">d</mml:mi></mml:math>-Wave Superconductivity in the Hubbard Model
-Wave Superconductivity in the Hubbard Model Open
The superconducting instabilities of the doped repulsive 2D Hubbard model are studied in the intermediate to strong coupling regime with the help of the dynamical cluster approximation. To solve the effective cluster problem we employ an e…
View article: Low-energy scale of the periodic Anderson model
Low-energy scale of the periodic Anderson model Open
Wilson's Numerical Renormalization Group method is used to study the paramagnetic ground state of the periodic Anderson model within the dynamical mean-field approach. For the particle-hole symmetric model, which is a Kondo insulator, we f…