89 citations · 572 across the 23 of their papers we have counts for
23 papers
Observation of Two Cascading Screening Processes in an Iron-based Superconductor
Ming-Hua Chang, Steffen Backes, Donghui Lu +8
Understanding how renormalized quasiparticles emerge in strongly correlated electron materials provides a challenge for both experiment and theory. It has been predicted that disti…
Dispersion kinks from electronic correlations in an unconventional iron-based superconductor
Ming-Hua Chang, Steffen Backes, Donghui Lu +7
The attractive interaction in conventional BCS superconductors is provided by a bosonic mode. However, the pairing glue of most unconventional superconductors is unknown. The effec…
Diagnostics for plasmon satellites and Hubbard bands in transition metal oxides
Steffen Backes, Hong Jiang, Silke Biermann
Coulomb correlations between the electrons imprint characteristic signatures to the spectral properties of materials. Among others, they are at the origin of a rich phenomenology o…
Dynamical mean-field theory for the Hubbard-Holstein model on a quantum device
Steffen Backes, Yuta Murakami, Shiro Sakai +1
Recent developments in quantum hardware and quantum algorithms have made it possible to utilize the capabilities of current noisy intermediate-scale quantum devices for addressing…
A Kitaev material on the triangular lattice: The case of NaRuO
Aleksandar Razpopov, David A. S. Kaib, Steffen Backes +5
Motivated by recent reports of a quantum disordered ground state in the triangular lattice compound NaRuO, we derive a magnetic model for this system by means…
Improved effective vertices in the multi-orbital Two-Particle Self-Consistent method from Dynamical Mean-Field Theory
Karim Zantout, Steffen Backes, Aleksandar Razpopov +2
In this work we present a multi-orbital form of the Two-Particle Self-Consistent approach (TPSC), here the effective local and static irreducible interaction vertices are determine…
Microscopic origin of magnetism in monolayer transition metal dihalides
Kira Riedl, Danila Amoroso, Steffen Backes +7
Motivated by the recent wealth of exotic magnetic phases emerging in two-dimensional frustrated lattices, we investigate the origin of possible magnetism in the monolayer family of…
Electronic and magnetic properties of the RuX (X=Cl, Br, I) family: Two siblings -- and a cousin?
David A. S. Kaib, Kira Riedl, Aleksandar Razpopov +4
Motivated by recent reports of metallic behavior in the recently synthesized RuI, in contrast to the Mott-insulating nature of the actively discussed -RuCl, as well as R…
Non-local Correlation Effects in Fermionic Many-Body Systems: Overcoming the Non-causality Problem
Steffen Backes, Jae-Hoon Sim, Silke Biermann
Motivated by the intriguing physics of quasi-2d fermionic systems, such as high-temperature superconducting oxides, layered transition metal chalcogenides or surface or interface s…
Two-Particle Self-Consistent method for the multi-orbital Hubbard model
Karim Zantout, Steffen Backes, Roser Valenti
One of the most challenging problems in solid state systems is the microscopic analysis of electronic correlations. A paramount minimal model that encodes correlation effects is th…
Effect of non-local correlations on the electronic structure of LiFeAs
Karim Zantout, Steffen Backes, Roser Valentí
We investigate the role of non-local correlations in LiFeAs by exploring an ab-initio-derived multi-orbital Hubbard model for LiFeAs via the Two-Particle Self-Consistent (TPSC) app…
Superconductivity in correlated BEDT-TTF molecular conductors: critical temperatures and gap symmetries
Karim Zantout, Michaela Altmeyer, Steffen Backes +1
Starting from an {\it ab initio}-derived two-site dimer Hubbard hamiltonian on a triangular lattice, we calculate the superconducting gap functions and critical temperatures for re…
Novel approaches to spectral properties of correlated electron materials: From generalized Kohn-Sham theory to screened exchange dynamical mean field theory
Pascal Delange, Steffen Backes, Ambroise van Roekeghem +3
The most intriguing properties of emergent materials are typically consequences of highly correlated quantum states of their electronic degrees of freedom. Describing those materia…
Formation of Hubbard-like bands as a fingerprint of strong electron-electron interactions in FeSe
Matthew D. Watson, Steffen Backes, Amir A. Haghighirad +4
We use angle-resolved photo-emission spectroscopy (ARPES) to explore the electronic structure of single crystals of FeSe over a wide range of binding energies and study the effects…
Ab-initio perspective on structural and electronic properties of iron-based superconductors
Daniel Guterding, Steffen Backes, Milan Tomic +2
The discovery of iron pnictides and iron chalcogenides as a new class of unconventional superconductors in 2008 has generated an enourmous amount of experimental and theoretical wo…
Electron dichotomy on the SrTiO defect surface augmented by many-body effects
Frank Lechermann, Harald O. Jeschke, Aaram J. Kim +2
In a common paradigm, the electronic structure of condensed matter is divided into weakly and strongly correlated compounds. While conventional band theory usually works well for t…
Hubbard band or oxygen vacancy states in the correlated electron metal SrVO?
S. Backes, T. C. Rödel, F. Fortuna +19
We study the effect of oxygen vacancies on the electronic structure of the model strongly correlated metal SrVO. By means of angle-resolved photoemission (ARPES) synchrotron ex…
Microscopic nature of correlations in multi-orbital AFe2As2 (A=K, Rb, Cs): Hund's coupling versus Coulomb repulsion
Steffen Backes, Harald O. Jeschke, Roser Valenti
We investigate via LDA+DMFT (local density approximation combined with dynamical mean field theory) the manifestation of correlation effects in a wide range of binding energies in…
Unified Convex Optimization Approach to Super-Resolution Based on Localized Kernels
Tamir Bendory, Shai Dekel, Arie Feuer
The problem of resolving the fine details of a signal from its coarse scale measurements or, as it is commonly referred to in the literature, the super-resolution problem arises na…
Correlation effects in the tetragonal and collapsed tetragonal phase of CaFe2As2
Jean Diehl, Steffen Backes, Daniel Guterding +2
We investigate the role of correlations in the tetragonal and collapsed tetragonal phases of CaFe2As2 by performing charge self-consistent DFT+DMFT (density functional theory combi…
Electronic structure and de Haas-van Alphen frequencies in KFe2As2 within LDA+DMFT
Steffen Backes, Daniel Guterding, Harald O. Jeschke +1
Recent density functional theory (DFT) calculations for KFe2As2 have shown to be insufficient to satisfactorily describe angle-resolved photoemission (ARPES) measurements as well a…
Finite temperature and pressure molecular dynamics for BaFe2As2
Steffen Backes, Harald O. Jeschke
We study the temperature and pressure dependence of the structural and electronic properties of the iron pnictide superconductor BaFe2As2. We use density functional theory based Bo…
Monte Carlo study of fermionic trions in a square lattice with harmonic confinement
S. Backes, I. Titvinidze, A. Privitera +1
We investigate the strong-coupling limit of a three-component Fermi mixture in an optical lattice with attractive interactions. In this limit bound states (trions) of the three com…