Spectral properties of locally correlated electrons in a Bardeen–Cooper–Schrieffer superconductor
- J. Bauer, A. Oguri, A. C. Hewson
- Physics
- 30 July 2007
We present a detailed study of the spectral properties of a locally correlated site embedded in a Bardeen–Cooper–Schrieffer (BCS) superconducting medium. To this end the Anderson impurity model with…
Competition between antiferromagnetic and charge order in the Hubbard-Holstein model
We study the competition between an instantaneous local Coulomb repulsion and a boson mediated retarded attraction, as described by the Hubbard-Holstein model. Restricting to the case of…
From infinite to two dimensions through the functional renormalization group.
- C. Taranto, S. Andergassen, A. Toschi
- PhysicsPhysical Review Letters
- 12 July 2013
A novel scheme for an unbiased, nonperturbative treatment of strongly correlated fermions that combines two of the most successful many-body methods, the dynamical mean field theory and the functional renormalization group, is presented.
Realizing a Kondo-correlated state with ultracold atoms.
- J. Bauer, C. Salomon, E. Demler
- PhysicsPhysical Review Letters
- 2 August 2013
It is illustrated that a mixture of 40K and 23Na atoms can be used to generate a Kondo-correlated state and that momentum resolved radio frequency spectroscopy can provide unambiguous signatures of the formation of Kondo resonances at the Fermi energy.
Microscopic resolution of the interplay of Kondo screening and superconducting pairing
- J. Bauer, J. Pascual, K. Franke
- Physics
- 15 August 2012
Magnetic molecules adsorbed on a superconductor give rise to a local competition of Cooper pair and Kondo singlet formation inducing subgap bound states. For Manganese-phthalocyanine molecules on a…
Magnetic Field Effects on Quasiparticles in Strongly Correlated Local Systems
- A. C. Hewson, J. Bauer, W. Koller
- Physics
- 19 August 2005
We show that quasiparticles in a magnetic field of arbitrary strength $H$ can be described by field dependent parameters. We illustrate this approach in the case of an Anderson impurity model and use…
Dynamical mean-field theory and numerical renormalization group study of superconductivity in the attractive Hubbard model
We present a study of the attractive Hubbard model based on the dynamical mean field theory (DMFT) combined with the numerical renormalization group (NRG). For this study the NRG method is extended…
Field-dependent quasiparticles in the infinite-dimensional Hubbard model
- J. Bauer, A. C. Hewson
- Physics
- 25 May 2007
We present dynamical mean-field theory (DMFT) results for the local spectral densities of the one- and two-particle response functions for the infinite-dimensional Hubbard model in a magnetic field.…
Analysis of low energy response and possible emergent SU(4) Kondo state in a double quantum dot
- Y. Nishikawa, A. Hewson, D. Crow, J. Bauer
- Physics
- 6 September 2013
We examine the low energy behavior of a double quantum dot in a regime where spin and pseudospin excitations are degenerate. The individual quantum dots are described by Anderson impurity models with…
Competing interactions and symmetry breaking in the Hubbard-Holstein model
- J. Bauer
- Physics
- 22 July 2009
Competing interactions are often responsible for intriguing phase diagrams in correlated electron systems. Here we analyze the competition of instantaneous short-range Coulomb interaction U with the…
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