183 citations · 893 across the 18 of their papers we have counts for
19 papers
adapol: Adaptive pole-fitting for quantum many-body physics
Zhen Huang, Chia-Nan Yeh, Lin Lin +3
We describe adapol, a Python package for fitting Matsubara Green's functions, self-energies, and hybridization functions by a compact sum of simple poles with real pole locations a…
Disentangling real space fluctuations: the diagnostics of metal-insulator transitions beyond single-particle spectral functions
Michael Meixner, Marcel Krämer, Nils Wentzell +4
The destruction of metallicity due to the mutual Coulomb interaction of quasiparticles gives rise to fascinating phenomena of solid state physics such as the Mott metal-insulator t…
cppdlr: Imaginary time calculations using the discrete Lehmann representation
Jason Kaye, Hugo U. R. Strand, Nils Wentzell
We introduce cppdlr, a C++ library implementing the discrete Lehmann representation (DLR) of functions in imaginary time and Matsubara frequency, such as Green's functions and self…
Low rank Green's function representations applied to dynamical mean-field theory
Nan Sheng, Alexander Hampel, Sophie Beck +4
Several recent works have introduced highly compact representations of single-particle Green's functions in the imaginary time and Matsubara frequency domains, as well as efficient…
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…
Comparing the effective enhancement of local and non-local spin-orbit couplings on honeycomb lattices due to strong electronic correlations
Markus Richter, Johannes Graspeuntner, Thomas Schäfer +2
We investigate the interplay of electronic correlations and spin-orbit coupling (SOC) for a one-band and a two-band honeycomb lattice model. The main difference between the two mod…
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…
Planckian Metal at a Doping-Induced Quantum Critical Point
Philipp T. Dumitrescu, Nils Wentzell, Antoine Georges +1
We numerically study a model of interacting spin- electrons with random exchange coupling on a fully connected lattice. This model hosts a quantum critical point separating tw…
Tracking the Footprints of Spin Fluctuations: A MultiMethod, MultiMessenger Study of the Two-Dimensional Hubbard Model
Thomas Schäfer, Nils Wentzell, Fedor Šimkovic +23
The Hubbard model represents the fundamental model for interacting quantum systems and electronic correlations. Using the two-dimensional half-filled Hubbard model at weak coupling…
Real-space cluster dynamical mean-field theory: Center focused extrapolation on the one- and two particle level
Marcel Klett, Nils Wentzell, Thomas Schäfer +4
We revisit the cellular dynamical mean-field theory (CDMFT) for the single band Hubbard model on the square lattice at half filling, reaching real-space cluster sizes of up to 9 x…
Linear resistivity and Sachdev-Ye-Kitaev (SYK) spin liquid behavior in a quantum critical metal with spin- fermions
Peter Cha, Nils Wentzell, Olivier Parcollet +2
`Strange metals' with resistivity depending linearly on temperature down to low- have been a long-standing puzzle in condensed matter physics. Here, we consider a model of i…
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…
Conductivity in the square lattice Hubbard model at high temperatures: importance of vertex corrections
Jaksa Vucicevic, Jure Kokalj, Rok Zitko +3
Recent experiments on cold atoms in optical lattices allow for a quantitative comparison of the measurements to the conductivity calculations in the square lattice Hubbard model. H…
Efficient Bethe-Salpeter equations' treatment in dynamical mean-field theory
Agnese Tagliavini, Stefan Hummel, Nils Wentzell +3
We present here two alternative schemes designed to correct the high-frequency truncation errors in the numerical treatment of the Bethe-Salpeter equations. The schemes are applica…
Practical consequences of Luttinger-Ward functional multivaluedness for cluster DMFT methods
Jaksa Vucicevic, Nils Wentzell, Michel Ferrero +1
The Luttinger-Ward functional (LWF) has been a starting point for conserving approximations in many-body physics for 50 years. The recent discoveries of its multivaluedness and the…
High-frequency asymptotics of the vertex function: diagrammatic parametrization and algorithmic implementation
N. Wentzell, G. Li, A. Tagliavini +5
Vertex functions are a crucial ingredient of several forefront many-body algorithms in condensed matter physics. However, the full treatment of their frequency and momentum depende…
Magneto-electric spectroscopy of Andreev bound states in Josephson quantum dots
Nils Wentzell, Serge Florens, Tobias Meng +2
We theoretically investigate the behavior of Andreev levels in a single-orbital interacting quantum dot in contact to superconducting leads, focusing on the effect of electrostatic…
Efficient implementation of the parquet equations -- role of the reducible vertex function and its kernel approximation
Gang Li, Nils Wentzell, Petra Pudleiner +2
We present an efficient implementation of the parquet formalism which respects the asymptotic structure of the vertex functions at both single- and two-particle levels in momentum-…
Correlated starting points for the functional renormalization group
Nils Wentzell, Ciro Taranto, Andrey A. Katanin +2
We present a general frame to extend functional renormalization group (fRG) based computational schemes by using an exactly solvable interacting reference problem as starting point…