192 citations · 1.7k across the 51 of their papers we have counts for
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Response theory for time-resolved second-harmonic generation and two-photon photoemission
C. Timm, K. H. Bennemann
A unified response theory for the time-resolved nonlinear light generation and two-photon photoemission (2PPE) from metal surfaces is presented. The theory allows to describe the d…
Theory for two-photon photoemission: transport and temperature effects
R. Knorren, G. Bouzerar, K. H. Bennemann
Using a theory which treats on equal footing transport of excited electrons and electron-phonon scattering, we are able to explain the temperature dependence of the relaxation time…
Dynamics of Excited Electrons in Copper: Role of Auger Electrons
R. Knorren, G. Bouzerar, K. H. Bennemann
Within a theoretical model based on the Boltzmann equation, we analyze in detail the structure of the unusual peak recently observed in the relaxation time in Cu. In particular, we…
Dynamics of Excited Electrons in Copper and Ferromagnetic Transition Metals: Theory and Experiment
R. Knorren, K. H. Bennemann, R. Burgermeister +1
Both theoretical and experimental results for the dynamics of photoexcited electrons at surfaces of Cu and the ferromagnetic transition metals Fe, Co, and Ni are presented. A model…
Doping dependence of the Neel temperature in Mott-Hubbard antiferromagnets: Effect of vortices
Carsten Timm, K. H. Bennemann
The rapid destruction of long-range antiferromagnetic order upon doping of Mott-Hubbard antiferromagnetic insulators is studied within a generalized Berezinskii-Kosterlitz-Thouless…
Angular Dependences of Third Harmonic Generation from Microdroplets
J. Kasparian, B. Krämer, J. P. Dewitz +9
We present experimental and theoretical results for the angular dependence of third harmonic generation (THG) of water droplets in the micrometer range (size parameter )…
Theory for the giant magneto-optical Kerr rotation in CeSb
U. Pustogowa, W. Huebner, K. H. Bennemann
We calculate the linear magneto-optical Kerr rotation angle for CeSb in the near-infrared spectral range. Using an exact formula for large Kerr rotation angles and a simplified ele…
Symmetry Analysis of the Nonlinear Optical Response: New Magneto-Optical Effect in Second Harmonic Generation
A. Daehn, W. Huebner, K. H. Bennemann
Using symmetry arguments we show how optical second harmonic generation (SHG) can be used to detect antiferromagnetism at surfaces and in thin films. Based on the group theoretical…
Multiple-Scattering Theory of X-Ray Magnetic Circular Dichroism: Implementation and Results for Iron K-edge
Ch. Brouder, M. Alouani, K. H. Bennemann
An implementation of the multiple-scattering approach to x-ray magnetic circular dichroism (XMCD) in K-edge x-ray absorption spectroscopy is presented. The convergence problems due…
Theory for Dynamical Short Range Order and Fermi Surface Volume in Strongly Correlated Systems
J. Schmalian, M. Langer, S. Grabowski +1
Using the fluctuation exchange approximation of the one band Hubbard model, we discuss the origin of the changing Fermi surface volume in underdoped cuprate systems due to the tran…
Theory for the Nonlinear Ultrafast Dynamics of Small Clusters after Ionization
M. E. Garcia, D. Reichardt, K. H. Bennemann
The ultrafast relaxation of small clusters immediately after ionization is studied. For small Hg clusters we determine the fragmentation-time distributions induced by ionizatio…
Electronic Theory for Bilayer-Effects in High-T_c Superconductors
S. Grabowski, J. Schmalian, M. Langer +1
The normal and the superconducting state of two coupled CuO_2 layers in the High-T_c superconductors are investigated by using the bilayer Hubbard model, the FLEX approximation on…
Theory for the Dependence of Optical Second Harmonic Generation Intensity on Non-equilibrium Electron Temperatures at Metal Surfaces
T. A. Luce, W. Huebner, K. H. Bennemann
We present a theory for the electron-temperature dependence of optical second harmonic generation (SHG). Such an analysis is required to study the dynamics of metallic sys…
Theory for the Doping Dependence of Spin Fluctuation Induced Shadow States in High-T Superconductors
M. Langer, J. Schmalian, S. Grabowski +1
We analyze the doping dependence of the intensity and energetical position of shadow states in high -T superconductors within the 2D Hubbard model and using our recently deve…
A new approach for perovskites in large dimensions
J. Schmalian, P. Lombardo, M. Avignon +1
Using the Hubbard Hamiltonian for transition metal-3d and oxygen-2p states with perovskite geometry, we propose a new scaling procedure for a nontrivial extension of these systems…
Theory for Superconducting Properties of the Cuprates: Doping Dependence of the Electronic Excitations and Shadow States
S. Grabowski, M. Langer, J. Schmalian +1
The superconducting phase of the 2D one-band Hubbard model is studied within the FLEX approximation and by using an Eliashberg theory. We investigate the doping dependence of …
Electronic Theory for the Transition from Fermi-Liquid to Non-Fermi-Liquid Behavior in High-T Superconductors
M. Langer, J. Schmalian, S. Grabowski +1
We analyze the breakdown of Fermi-liquid behavior within the 2D Hubbard model as function of doping using our recently developed numerical method for the self consistent summation…
Theory of Nonlinear Magneto-Optics
U. Pustogowa, T. A. Luce, W. Hubner +1
Nonlinear magneto-optics is a very sensitive fingerprint of the electronic, magnetic, and atomic structure of surfaces, interfaces, and thin ferromagnetic films. Analyzing theoreti…
Nonlinear magneto-optical Kerr spectra of thin ferromagnetic iron films calculated with ab initio theory
U. Pustogowa, W. Hubner, K. H. Bennemann
Using a spin-polarized full-potential linear muffin-tin orbital method we present calculations of the nonlinear magneto-optical Kerr effect for thin bcc Fe films within a slab geom…
Theory for the Interdependence of High-T Superconductivity and Dynamical Spin Fluctuations
S. Grabowski, J. Schmalian, M. Langer +1
The doping dependence of the superconducting state for the 2D one-band Hubbard Hamiltonian is determined. By using an Eliashberg-type theory, we find that the gap function $Δ_{\bf…
Theory for the excitation spectrum of High-T$_c superconductors : quasiparticle dispersion and shadows of the Fermi surface
M. Langer, J. Schmalian, S. Grabowski +1
Using a new method for the solution of the FLEX-equations, which allows the determination of the self energy of the Hubbard model on the real frequency axis, we…
Magnetocrystalline Anisotropy Energy of a Transition Metal Monolayer: A Non-perturbative Theory
T. H. Moos, W. Hübner, K. H. Bennemann
The magnetocrystalline anisotropy energy for a monolayer of Fe and Ni is determined using a fully convergent tight-binding calculation including - hybridization. T…
Theory for Nonlinear Mie-Scattering from Spherical Metal Clusters
J. Dewitz, W. Hubner, K. H. Bennemann
Using classical electrodynamics we determine the angular dependence of the light intensities radiated in second and third harmonic generation by spherical metal clusters. Forward a…