104 citations · 508 across the 21 of their papers we have counts for
22 papers
Real-time Dyson expansion for the nonequilibrium approximation: Correlated spectra and dependence on the reference propagator
Erik Schroedter, Jan-Philip Joost, Michael Bonitz +1
Electronic spectra provide direct insight into the excitations and correlations of condensed matter systems. Their description requires electron correlations beyond mean field. In…
Nonequilibrium Green Functions Simulations for Large Correlated Systems
Erik Schroedter, Michael Bonitz, Jan-Philip Joost
Correlated real-time dynamics in large, spatially inhomogeneous quantum systems remain difficult to access with nonequilibrium many-body methods. Two-time nonequilibrium Green func…
Electronic correlation effects in the response of graphene and MoS2 monolayers to the impact of highly-charged ions
Giorgio Lovato, Michael Bonitz, Karsten Balzer +2
The interaction of highly-charged ions with monolayers of graphene and MoS2 is theoretically investigated based on nonequilibrium Green Functions (NEGF). In a recent paper [Niggas…
Ultrafast Charge Separation Induced by a Uniform Field in Graphene Nanoribbons
Jan-Philip Joost, Michael Bonitz
When heteronuclear molecules are illuminated by light of spatially uniform intensity, electronic excitations may, nevertheless, be restricted to parts of the system, depending on t…
The 2025 Roadmap to Ultrafast Dynamics: Frontiers of Theoretical and Computational Modelling
Fabio Caruso, Michael A. Sentef, Claudio Attaccalite +27
The exploration of ultrafast phenomena is a frontier of condensed matter research, where the interplay of theory, computation, and experiment is unveiling new opportunities for und…
Accelerating Nonequilibrium Green functions simulations: the G1-G2 scheme and beyond
Michael Bonitz, Jan-Philip Joost, Christopher Makait +3
The theory of Nonequilibrium Green functions (NEGF) has seen a rapid development over the recent three decades. Applications include diverse correlated many-body systems in and out…
Quantum Fluctuations Approach to the Nonequilibrium -Approximation II: Density Correlations and Dynamic Structure Factor
Erik Schroedter, Björn Jakob Wurst, Jan-Philip Joost +1
The quantum dynamics of correlated fermionic or bosonic many-body systems following external excitation can be successfully studied using nonequilibrium Green functions (NEGF) or r…
Accelerating Nonequilibrium Green functions simulations with embedding selfenergies
Karsten Balzer, Niclas Schlünzen, Hannes Ohldag +2
Real-time nonequilibrium Green functions (NEGF) have been very successful to simulate the dynamics of correlated many-particle systems far from equilibrium. However, NEGF simulatio…
Quantum fluctuations approach to the nonequilibrium approximation
Erik Schroedter, Jan-Philip Joost, Michael Bonitz
The quantum dynamics of fermionic or bosonic many-body systems following external excitation can be successfully studied using two-time nonequilibrium Green's functions (NEGF) or s…
The dynamically screened ladder approximation: Simultaneous treatment of strong electronic correlations and dynamical screening out of equilibrium
Jan-Philip Joost, Niclas Schlünzen, Hannes Ohldag +3
Dynamical screening is a key property of charged many-particle systems. Its theoretical description is based on the approximation that is extensively applied for ground-state…
Doublon production in correlated materials by multiple ion impacts
Lotte Borkowski, Niclas Schlünzen, Jan Philip Joost +2
In a recent Letter [Balzer \textit{et al.}, Phys. Rev. Lett. \textbf{121}, 267602 (2018)] it was demonstrated that ions impacting a correlated graphene cluster can excite strongly…
Löwdin's symmetry dilemma within Green functions theory for the one-dimensional Hubbard model
J. -P. Joost, N. Schlünzen, S. Hese +4
The energy gap of correlated Hubbard clusters is well studied for one-dimensional systems using analytical methods and density-matrix-renormalization-group (DMRG) simulations. Beyo…
The G1--G2 Scheme: Dramatic Acceleration of Nonequilibrium Green Functions Simulations Within the Hartree--Fock-GKBA
J. -P. Joost, N. Schlünzen, M. Bonitz
The time evolution in quantum many-body systems after external excitations is attracting high interest in many fields. The theoretical modeling of these processes is challenging, a…
Correlated Topological States in Graphene Nanoribbon Heterostructures
Jan-Philip Joost, Antti-Pekka Jauho, Michael Bonitz
Finite graphene nanoribbon (GNR) heterostructures host intriguing topological in-gap states (Rizzo, D. J. et al.~\textit{Nature} \textbf{2018}, \textit{560}, 204]). These states ma…
Achieving the Ultimate Scaling Limit for Nonequilibrium Green Functions Simulations
Niclas Schluenzen, Jan-Philip Joost, Michael Bonitz
The dynamics of strongly correlated fermions following an external excitation reveals extremely rich collective quantum effects. Examples are fermionic atoms in optical lattices, e…
Ion Impact Induced Ultrafast Electron Dynamics in Correlated Materials and Finite Graphene Clusters
M. Bonitz, K. Balzer, N. Schlünzen +2
Strongly correlated systems of fermions have an interesting phase diagram arising from the Hubbard gap. Excitation across the gap leads to the formation of doubly occupied lattice…
Doublon formation by ions impacting a strongly correlated finite lattice system
Karsten Balzer, Maximilian Rodriguez Rasmussen, Niclas Schlünzen +2
Strongly correlated systems of fermions have a number of exciting collective properties. Among them, the creation of a lattice that is occupied by doublons, i.e. two quantum partic…
Wakefields in streaming plasmas: Characteristics of the induced charge density distribution
Zh. A. Moldabekov, P. Ludwig, J. -P. Joost +2
Motivated by experiments on the generation of streaming plasmas in high energy density facilities, industrial setups, and fundamental dusty plasma research the plasma polarization…
Collision induced amplification of wakes in streaming plasmas
Sita Sundar, Hanno Kählert, Jan-Philip Joost +2
This work examines the formation of wake fields caused by ions streaming around a charged dust particle, using three-dimensional particle-in-cell (PIC) simulations with charge-neut…
Nonequilibrium dynamics in the one-dimensional Fermi-Hubbard model: A comparison of the nonequilibrium Green functions approach and the density matrix renormalization group method
N. Schluenzen, J. -P. Joost, F. Heidrich-Meisner +1
The nonequilibrium dynamics of strongly-correlated fermions in lattice systems have attracted considerable interest in the condensed matter and ultracold atomic-gas communities. Wh…
Comment on "On the unphysical solutions of the Kadanoff--Baym equations in linear response: Correlation-induced homogeneous density-distribution and attractors"
N. Schlünzen, J. -P. Joost, M. Bonitz
In a recent Rapid Communication [A. Stan, Phys. Rev. B \textbf{93}, 041103(R) (2016)], the reliability of the Keldysh--Kadanoff--Baym equations (KBE) using correlated selfenergy ap…
Screened Coulomb potential in a flowing magnetized plasma
Jan-Philip Joost, Patrick Ludwig, Hanno Kählert +2
The electrostatic potential of a moving dust grain in a complex plasma with magnetized ions is computed using linear response theory, thereby extending our previous work for unmagn…