60 citations · 400 across the 40 of their papers we have counts for
42 papers
Transport statistics and thermoelectric performance of Hofstadters butterfly
Friedemann Queißer, Gernot Schaller
We investigate electrons subject to a magnetic field that may tunnel along a square lattice and additionally to two electronic leads. Using non-equilibrium Greens functions we eval…
Evolution of terahertz third harmonic response across rare-earth nickelate phase-diagram
Gulloo Lal Prajapati, Igor Ilyakov, Alexey Ponomaryov +8
High harmonic generation (HHG) is a sensitive probe for investigating electronic structures and dynamics of materials and a source for attosecond pulses. In particular, HHG with te…
Exploring bosonic bound states with parallel reaction coordinates
Guan-Yu Lai, Friedemann Queißer, Gernot Schaller
Bound states are dissipation-resilient states that may emerge when quantum systems are strongly coupled to reservoirs with band gaps. We analyze an exactly solvable bosonic model f…
Disorder-induced localisation in the Mott-Hubbard model
Ričards Kristers Knipšis, Friedemann Queisser, Jesumony Jayabalan +4
For the Fermi-Hubbard model in the Mott insulator phase, we employ the hierarchy of correlations to study how doublon and holon quasi-particle excitations are affected by adding di…
Higher harmonics in Mott-Hubbard insulators as sensors
Abdelrahman Azab, Friedemann Queisser, Gulloo Lal Prajapati +2
Using strong-coupling time-dependent perturbation theory, we study the response of Mott and charge-transfer insulators to an oscillating electric field. We derive analytical expres…
Magneto-photoelectric effect in graphene via tailored potential landscapes
Joris Josiek, Friedemann Queisser, Stephan Winnerl +1
We consider the propagation of charge carriers in planar graphene under the combined influence of a constant transversal magnetic field and an in-plane varying electric potenti…
Finite-time performance of a cyclic 2d quantum Ising heat engine
S. P. Katoorani, C. Kohlfürst, F. Queisser +2
We discuss the limit cycle regime of a finite-time quantum Otto cycle with a frictionless two-dimensional anisotropic Ising model as the working fluid. From Onsagers exact equilibr…
Continuous Dimer Angles on the Silicon Surface: Critical Properties and the Kibble-Zurek Mechanism
Andreas Weitzel, Gernot Schaller, Friedemann Queisser +1
Langevin dynamics simulations are used to analyze the static and dynamic properties of an {XY} model adapted to dimers forming on Si(001) surfaces. The numerics utilise high-perfor…
Back-reaction and correlation effects on pre-thermalization in Mott-Hubbard systems
Friedemann Queisser, Christian Kohlfürst, Ralf Schützhold
For the Fermi-Hubbard model in the strongly interacting Mott insulator state, we study the pre-thermalization dynamics after a quench. To this end, we employ the method of the hier…
Kibble-Zurek dynamics in the anisotropic Ising model of the Si(001) surface
Gernot Schaller, Friedemann Queisser, Seyedeh Parya Katoorani +8
As a simplified description of the non-equilibrium dynamics of buckled dimers on the Si(001) surface, we consider the anisotropic 2D Ising model and study the freezing of spatial c…
Floquet analysis of a superradiant many-qutrit refrigerator
Dmytro Kolisnyk, Friedemann Queisser, Gernot Schaller +1
We investigate superradiant enhancements in the refrigeration performance of a set of three-level systems that are collectively coupled to a hot and a cold thermal reservoir an…
Dynamically Assisted Tunneling in the Floquet Picture
Daniil Ryndyk, Christian Kohlfürst, Friedemann Queisser +1
We study how tunneling through a potential barrier can be enhanced by an additional harmonically oscillating electric field . To th…
Higher-harmonic generation in the driven Mott-Hubbard model
Friedemann Queisser, Ralf Schützhold
Using Floquet theory and the hierarchy of correlations, we study the non-equilibrium dynamics of the Mott insulator state in the Fermi-Hubbard model under the influence of a harmon…
Doublon-holon pair creation in Mott-Hubbard systems in analogy to QED
Friedemann Queisser, Konstantin Krutitsky, Patrick Navez +1
Via the hierarchy of correlations, we study doublon-holon pair creation in the Mott state of the Fermi-Hubbard model induced by a time-dependent electric field. Special emphasis is…
Attraction versus repulsion between doublons or holons in Mott-Hubbard systems
Friedemann Queisser, Gernot Schaller, Ralf Schützhold
For the Mott insulator state of the Fermi-Hubbard model in the strong-coupling limit, we study the interaction between quasi-particles in the form of doublons and holons. Comparing…
Quasi-particle propagation across semiconductor-Mott insulator interfaces
Jan Verlage, Friedemann Queisser, Nikodem Szpak +3
As a prototypical example for a heterostructure combining a weakly and a strongly interacting quantum many-body system, we study the interface between a semiconductor and a Mott in…
Environment-induced decay dynamics of anti-ferromagnetic order in Mott-Hubbard systems
Gernot Schaller, Friedemann Queisser, Nikodem Szpak +2
We study the dissipative Fermi-Hubbard model in the limit of weak tunneling and strong repulsive interactions, where each lattice site is tunnel-coupled to a Markovian fermionic ba…
Optical absorption and carrier multiplication at graphene edges in a magnetic field
Friedemann Queisser, Sascha Lang, Ralf Schützhold
We study optical absorption at graphene edges in a transversal magnetic field. The magnetic field bends the trajectories of particle- and hole excitations into antipodal direction…
Dynamically assisted tunneling in the impulse regime
Christian Kohlfürst, Friedemann Queisser, Ralf Schützhold
We study the enhancement of tunneling through a potential barrier by a time-dependent electric field with special emphasis on pulse-shaped vector potentials such as $A_x(t)=…
Comment on "Enhanced deuterium-tritium fusion cross sections in the presence of strong electromagnetic fields"
Friedemann Queisser, Ralf Schützhold
In their article [Phys.\ Rev.\ C {\bf 100}, 064610 (2019)], Lv, Duan, and Liu study the enhancement of deuterium-tritium fusion reactions by the electromagnetic field of an x-ray f…
Hierarchy of double-time correlations
Friedemann Queisser, Ralf Schützhold
The hierarchy of correlations is an analytical approximation method which allows us to study non-equilibrium phenomena in strongly interacting quantum many-body systems on lattices…
Boltzmann relaxation dynamics of strongly interacting spinless fermions on a lattice
Friedemann Queisser, Sebastian Schreiber, Peter Kratzer +1
Motivated by the recent interest in non-equilibrium phenomena in quantum many-body systems, we study strongly interacting fermions on a lattice by deriving and numerically solving…
Doublon bottleneck in the ultrafast relaxation dynamics of hot electrons in 1T-TaS_2
Isabella Avigo, Friedemann Queisser, Ping Zhou +4
Employing time-resolved photoelectron spectroscopy we analyze the relaxation dynamics of hot electrons in the charge density wave / Mott material 1T-TaS_2. At 1.2 eV above the Ferm…
Dynamically assisted nuclear fusion
Friedemann Queisser, Ralf Schützhold
We consider the prototypical deuterium-tritium fusion reaction. At intermediate initial kinetic energies (in the keV regime), a major bottle-neck of this reaction is the Coulomb ba…