35 citations · 166 across the 17 of their papers we have counts for
18 papers
A Unified Geometric Framework for Understanding Collider Event Manifolds
Tianji Cai, Hancheng Li
By defining notions of similarity between collider events, metrics give rise to event manifolds with nontrivial geometric structure. Understanding these structures and their relati…
Change in charge density wave order beyond the Lifshitz transition in 2H-Ta\textsubscript{1}S\textsubscript{2}
Mihir Date, Jan Berges, Enrico Da Como +6
We investigate electronic instabilities in 2H-TaS\textsubscript{2} and a self-intercalated variant, 2H-Ta\textsubscript{1+}S\textsubscript{2}. In conventional samples,…
Extraction of the self energy and Eliashberg function from angle resolved photoemission spectroscopy using the xARPES code
Thomas P. van Waas, Christophe Berthod, Jan Berges +3
Angle-resolved photoemission spectroscopy is a powerful experimental technique for studying anisotropic many-body interactions through the electron spectral function. Existing atte…
Persistence of charge ordering instability to Coulomb engineering in the excitonic insulator candidate TiSe
Sebastian Buchberger, Yann in 't Veld, Akhil Rajan +11
TiSe has long been considered one of the best candidate materials to host the elusive excitonic insulator (EI) phase. However, a finite coupling to the lattice can generically…
Inelastic tunneling into multipolaronic bound states in single-layer MoS
Camiel van Efferen, Laura Pätzold, Tfyeche Y. Tounsi +12
Polarons are quasiparticles that arise from the interaction of electrons or holes with lattice vibrations. Though polarons are well-studied across multiple disciplines, experimenta…
Phonon fluctuation diagnostics: Origin of charge order in AVSb kagome metals
Stefan Enzner, Jan Berges, Arne Schobert +7
The microsopic origin of the charge-density wave (CDW) in AVSb (A = K, Rb, Cs) kagome metals remains a longstanding question, often revolving around electron-phonon couplin…
Understanding the origin of superconducting dome in electron-doped MoS monolayer
Nina Girotto Erhardt, Jan Berges, Samuel Poncé +1
We investigate the superconducting properties of molybdenum disulphide (MoS) monolayer across a broad doping range, successfully recreating the so far unresolved superconductin…
Unconventional charge-density-wave gap in monolayer NbS
Timo Knispel, Jan Berges, Arne Schobert +5
Using scanning tunneling microscopy and spectroscopy, for a monolayer of transition metal dichalcogenide H-NbS grown by molecular beam epitaxy on graphene, we provide unambiguo…
Ab initio electron-lattice downfolding: potential energy landscapes, anharmonicity, and molecular dynamics in charge density wave materials
Arne Schobert, Jan Berges, Erik G. C. P. van Loon +4
The interplay of electronic and nuclear degrees of freedom presents an outstanding problem in condensed matter physics and chemistry. Computational challenges arise especially for…
Phonon Self-Energy Corrections: To Screen, or Not to Screen
Jan Berges, Nina Girotto, Tim Wehling +2
First-principles calculations of phonons are often based on the adiabatic approximation and on Brillouin-zone samplings that might not always be sufficient to capture the subtletie…
Engineering Interlayer Hybridization in Energy Space via Dipolar Overlayers
Bin Shao, Xiao Jiang, Jan Berges +2
The interlayer hybridization (IH) of van der Waals (vdW) materials is thought to be mostly associated with the unignorable interlayer overlaps of wavefunctions () in real space.…
Doping fingerprints of spin and lattice fluctuations in moiré superlattice systems
Niklas Witt, José M. Pizarro, Jan Berges +3
Twisted Van der Waals systems offer the unprecedented possibility to tune different states of correlated quantum matter with an external non-invasive electrostatic doping. The natu…
Downfolding the Su-Schrieffer-Heeger model
Arne Schobert, Jan Berges, Tim Wehling +1
Charge-density waves are responsible for symmetry-breaking displacements of atoms and concomitant changes in the electronic structure. Linear response theories, in particular densi…
Downfolding approaches to electron-ion coupling: Constrained density-functional perturbation theory for molecules
Erik G. C. P. van Loon, Jan Berges, Tim O. Wehling
Constrained electronic-structure theories enable the construction of effective low-energy models consisting of partially dressed particles. However, the interpretation and physical…
A full gap above the Fermi level: the charge density wave of monolayer VS2
Camiel van Efferen, Jan Berges, Joshua Hall +15
In the standard model of charge density wave (CDW) transitions, the displacement along a single phonon mode lowers the total electronic energy by creating a gap at the Fermi level,…
Ab initio phonon self-energies and fluctuation diagnostics of phonon anomalies: Lattice instabilities from Dirac pseudospin physics in transition metal dichalcogenides
Jan Berges, Erik G. C. P. van Loon, Arne Schobert +2
We present an ab initio approach for the calculation of phonon self-energies and their fluctuation diagnostics, which allows us to identify the electronic processes behind phonon a…
Electronic structure of single layer 1T-NbSe: interplay of lattice distortions, non-local exchange, and Mott-Hubbard correlations
E. Kamil, J. Berges, G. Schönhoff +4
Using ab-initio calculations we reveal the nature of the insulating phase recently found experimentally in monolayer 1T-NbSe. We find soft phonon modes in a large parts of the…
Plasmonic Superconductivity in Layered Materials
M. Rösner, R. E. Groenewald, G. Schönhoff +3
Plasmonic excitations behave fundamentally different in layered materials in comparison to bulk systems. They form gapless modes, which in turn couple at low energies to the electr…