167 citations · 1.2k across the 33 of their papers we have counts for
25 papers · 1 filter
Decomposing imaginary time Feynman diagrams using separable basis functions: Anderson impurity model strong coupling expansion
Jason Kaye, Zhen Huang, Hugo U. R. Strand +1
We present a deterministic algorithm for the efficient evaluation of imaginary time diagrams based on the recently introduced discrete Lehmann representation (DLR) of imaginary tim…
Dual Bethe-Salpeter equation for the multi-orbital lattice susceptibility within dynamical mean-field theory
Erik G. C. P. van Loon, Hugo U. R. Strand
Dynamical mean-field theory describes the impact of strong local correlation effects in many-electron systems. While the single-particle spectral function is directly obtained with…
Larmor precession in strongly correlated itinerant electron systems
Erik G. C. P. van Loon, Hugo U. R. Strand
Many-electron systems undergo a collective Larmor precession in the presence of a magnetic field. In a paramagnetic metal, the resulting spin wave provides insight into the correla…
Distinct spin and orbital dynamics in SrRuO
H. Suzuki, L. Wang, J. Bertinshaw +13
The unconventional superconductor SrRuO has long served as a benchmark for theories of correlated-electron materials. The determination of the superconducting pairing mecha…
Excitations and spectra from equilibrium real-time Green's functions
Xinyang Dong, Emanuel Gull, Hugo U. R. Strand
The real-time contour formalism for Green's functions provides time-dependent information of quantum many-body systems. In practice, the long-time simulation of systems with a wide…
Inter-orbital singlet pairing in SrRuO: a Hund's superconductor
Stefan Käser, Hugo U. R. Strand, Nils Wentzell +3
We study the superconducting gap function of SrRuO. By solving the linearized Eliashberg equation with a correlated pairing vertex extracted from a dynamical mean-field cal…
Optical properties of LaNiO3 films tuned from compressive to tensile strain
I. Ardizzone, M. Zingl, J. Teyssier +11
Materials with strong electronic correlations host remarkable -- and technologically relevant -- phenomena such as magnetism, superconductivity and metal-insulator transitions. Har…
Legendre-spectral Dyson equation solver with super-exponential convergence
Xinyang Dong, Dominika Zgid, Emanuel Gull +1
Quantum many-body systems in thermal equilibrium can be described by the imaginary time Green's function formalism. However, the treatment of large molecular or solid ab inito prob…
Strongly correlated materials from a numerical renormalization group perspective: How the Fermi-liquid state of SrRuO emerges
Fabian B. Kugler, Manuel Zingl, Hugo U. R. Strand +3
The crossover from fluctuating atomic constituents to a collective state as one lowers temperature or energy is at the heart of the dynamical mean-field theory description of the s…
Magnetic response of SrRuO: quasi-local spin fluctuations due to Hund's coupling
Hugo U. R. Strand, Manuel Zingl, Nils Wentzell +2
We study the magnetic susceptibility in the normal state of SrRuO using dynamical mean-field theory including dynamical vertex corrections. Besides the well known incommens…
High-resolution photoemission on Sr2RuO4 reveals correlation-enhanced effective spin-orbit coupling and dominantly local self-energies
A. Tamai, M. Zingl, E. Rozbicki +17
We explore the interplay of electron-electron correlations and spin-orbit coupling in the model Fermi liquid Sr2RuO4 using laser-based angle-resolved photoemission spectroscopy. Ou…
A comparative study of nonequilibrium insulator-to-metal transitions in electron-phonon systems
Sharareh Sayyad, Rok Zitko, Hugo U. R. Strand +2
We study equilibrium and nonequilibrium properties of electron-phonon systems described by the Hubbard-Holstein model using the dynamical mean-field theory. In equilibrium, we benc…
Theory of photoinduced ultrafast switching to a spin-orbital ordered `hidden' phase
Jiajun Li, Hugo U. R. Strand, Philipp Werner +1
Photoinduced hidden phases are often observed in materials with intertwined orders. Understanding the formation of these non-thermal phases is challenging and requires a resolution…
Coupled charge and spin dynamics in a photo-excited Mott insulator
Nikolaj Bittner, Denis Golež, Hugo U. R. Strand +2
Using a nonequilibrium implementation of the extended dynamical mean field theory (EDMFT) we simulate the relaxation after photo excitation in a strongly correlated electron system…
Enhanced pairing susceptibility in a photo-doped two-orbital Hubbard model
Philipp Werner, Hugo Strand, Shintaro Hoshino +2
Local spin fluctuations provide the glue for orbital-singlet spin-triplet pairing in the doped Mott insulating regime of multi-orbital Hubbard models. At large Hubbard repulsion $U…
Hund's coupling driven photo-carrier relaxation in the two-band Mott insulator
Hugo U. R. Strand, Denis Golež, Martin Eckstein +1
We study the relaxation dynamics of photo-carriers in the paramagnetic Mott insulating phase of the half-filled two-band Hubbard model. Using nonequilibrium dynamical mean field th…
Ultrafast doublon dynamics in photo-excited 1T-TaS
Manuel Ligges, Isabella Avigo, Denis Golež +8
Strongly correlated systems exhibit intriguing properties caused by intertwined microscopic in- teractions that are hard to disentangle in equilibrium. Employing non-equilibrium ti…
Nonequilibrium GW+EDMFT: Antiscreening and inverted populations from nonlocal correlations
Denis Golez, Lewin Boehnke, Hugo Strand +2
We study the dynamics of screening in photo-doped Mott insulators with long-ranged interactions using a nonequilibrium implementation of the plus extended dynamical mean field…
Ultrafast switching of composite order in AC
Philipp Werner, Hugo Strand, Shintaro Hoshino +1
We study the controlled manipulation of the Jahn-Teller metal state of fulleride compounds using nonequilibrium dynamical mean field theory. This anomalous metallic state is a spon…
Principle of Maximum Entanglement Entropy and Local Physics of Correlated many-body Electron-Systems
Nicola Lanatà, Hugo U. R. Strand, Yongxin Yao +1
We argue that, because of the quantum-entanglement, the local physics of the strongly-correlated materials at zero temperature is described in very good approximation by a simple g…
Valence-skipping and negative-U in the d-band from repulsive local Coulomb interaction
Hugo U. R. Strand
We show that repulsive local Coulomb interaction alone can drive valence-skipping charge disproportionation in the degenerate d-band, resulting in effective negative-U. This effect…
Distributional exact diagonalization formalism for quantum impurity models
Mats Granath, Hugo U. R. Strand
We develop a method for calculating the self-energy of a quantum impurity coupled to a continuous bath by stochastically generating a distribution of finite Anderson models that ar…
Efficient implementation of the Gutzwiller variational method
Nicola Lanatà, Hugo U. R. Strand, Xi Dai +1
We present a self-consistent numerical approach to solve the Gutzwiller variational problem for general multi-band models with arbitrary on-site interaction. The proposed method ge…
Discretized Thermal Green's Functions
Mats Granath, Andro Sabashvili, Hugo U. R. Strand +1
We present a spectral weight conserving formalism for Fermionic thermal Green's functions that are discretized in imaginary time and thus periodic in imaginary ("Matsubara") freque…