61 citations · 320 across the 18 of their papers we have counts for
19 papers
Beyond the conventional Emery model: crucial role of long-range hopping for cuprate superconductivity
Eric Jacob, M. O. Malcolms, Viktor Christiansson +6
The Emery model is the quintessential model for cuprate superconductors. In his eponymous paper, Emery only considered the next-nearest-neighbor oxygen-copper hopping. Later, also…
Closing in on possible scenarios for infinite-layer nickelates: comparison of dynamical mean-field theory with angular-resolved photoemission spectroscopy
Liang Si, Eric Jacob, Wenfeng Wu +6
Conflicting theoretical scenarios for infinite-layer nickelate superconductors have been hotly debated, particularly regarding whether {only} a single Ni-3 band is rel…
Spin fluctuations sufficient to mediate superconductivity in nickelates
Paul Worm, Qisi Wang, Motoharu Kitatani +12
Infinite-layer nickelates show high-temperature superconductivity, and the experimental phase diagram agrees well with the one simulated within the dynamical vertex approximation (…
Fermi and Luttinger arcs: two concepts, realized on one surface
Paul Worm, Matthias Reitner, Karsten Held +1
We present an analytically solvable model for correlated electrons, which is able to capture the major Fermi surface modifications occurring in both hole- and electron-doped cuprat…
Unconventional superconductivity without doping: infinite-layer nickelates under pressure
Simone Di Cataldo, Paul Worm, Jan Tomczak +2
High-temperature unconventional superconductivity quite generically emerges from doping a strongly correlated parent compound, often (close to) an antiferromagnetic insulator. The…
Chiral magnetism and ordering of oxygen vacancies in SrTiO
Liang Si, Xiaochao Wang, Paul Worm +4
Oxygen vacancies in the perovskite insulator SrTiO free electrons that couple with other physical degrees of freedom such as lattice, orbital, and spin. This leads to the emerg…
Strain-Tuned Magnetic Frustration in a Square Lattice - Material
I. Biało, L. Martinelli, G. De Luca +16
Magnetic frustration is a route that can lead to the emergence of novel ground states, including spin liquids and spin ices. Such frustration can be introduced through either the g…
Absence of electron-phonon-mediated superconductivity in hydrogen-intercalated nickelates
Simone Di Cataldo, Paul Worm, Liang Si +1
A recent experiment [X. Ding et al., Nature 615, 50 (2023)] indicates that superconductivity in nickelates is restricted to a narrow window of hydrogen concentration: 0.22 < x < 0.…
Topotactic-hydrogen forms chains in O nickelate superconductors
Liang Si, Paul Worm, Dachuan Chen +1
Despite enormous experimental and theoretical efforts, obtaining generally accepted conclusions regarding the intrinsic magnetic and electronic properties of superconducting nickel…
Merging numerical renormalization group and intermediate representation to compactify two- and three-point correlators
Sebastian Huber, Markus Wallerberger, Paul Worm +1
The vanguard of many-body theory is nowadays dealing with the full frequency dynamics of n-point Green's functions for n higher than two. Numerically, these objects easily become a…
Optimizing superconductivity: from cuprates via nickelates to palladates
Motoharu Kitatani, Liang Si, Paul Worm +3
Motivated by cuprate and nickelate superconductors, we perform a comprehensive study of the superconducting instability in the single-band Hubbard model. We calculate the spectrum…
Signatures of topotactic hydrogen in nickelate superconductors
Liang Si, Paul Worm, Karsten Held
Superconductivity has entered the nickel age marked by enormous experimental and theoretical efforts. Notwithstanding, synthesizing nickelate superconductors remains extremely chal…
Phase diagram of nickelate superconductors calculated by dynamical vertex approximation
Karsten Held, Liang Si, Paul Worm +5
We review the electronic structure of nickelate superconductors with and without effects of electronic correlations. As a minimal model we identify the one-band Hubbard model for t…
Correlations turn electronic structure of finite-layer nickelates upside down
Paul Worm, Liang Si, Motoharu Kitatani +3
Motivated by the recent discovery of superconductivity in the pentalayer nickelate NdNiO [Nature Materials 10.1038], we calculate its electronic structure and superc…
Hidden, one-dimensional, strongly nested, and almost half-filled Fermi surface in BaCuO superconductors
Paul Worm, Motoharu Kitatani, Jan M. Tomczak +2
All previous cuprate superconductors display a set of common features: (i) vicinity to a Cu 3 configuration; (ii) separated CuO planes; (iii) superconductivity for dopin…
Explaining the pseudogap through damping and antidamping on the Fermi surface by imaginary spin scattering
Friedrich Krien, Paul Worm, Patrick Chalupa +2
The mechanism of the pseudogap observed in hole-doped cuprates remains one of the central puzzles in condensed matter physics. We analyze this phenomenon via a Feynman-diagrammatic…
Broadening and sharpening of the Drude peak through antiferromagnetic fluctuations
Paul Worm, Clemens Watzenböck, Matthias Pickem +2
Antiferromagnetic or charge density wave fluctuations couple with light through the recently discovered π-ton contribution to the optical conductivity, and quite generically consti…
Enhancement of impact ionization in Hubbard clusters by disorder and next-nearest-neighbor hopping
Anna Kauch, Paul Worm, Paul Prauhart +3
We perform time-resolved exact diagonalization of the Hubbard model with time dependent hoppings on small clusters of up to sites. Here, the time dependence originates from a…
Electron-light interaction in nonequilibrium -- exact diagonalization for time dependent Hubbard Hamiltonians
Michael Innerberger, Paul Worm, Paul Prauhart +1
We present a straightforward implementation scheme for solving the time dependent Schrödinger equation for systems described by the Hubbard Hamiltonian with time dependent hoppings…