Zobrazeno 1 - 10
of 82
pro vyhledávání: '"Queisser, Friedemann"'
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-performance parallel computation methods on GPUs. The static exponent $\nu$ of
Externí odkaz:
http://arxiv.org/abs/2409.06412
Autor:
Schaller, Gernot, Queisser, Friedemann, Katoorani, Seyedeh Parya, Brand, Christian, Kohlfürst, Christian, Freeman, Mark R., Hucht, Alfred, Kratzer, Peter, Sothmann, Björn, Hoegen, Michael Horn-von, Schützhold, Ralf
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 correlations during a cooling quench across the critical point. We obse
Externí odkaz:
http://arxiv.org/abs/2310.18216
Publikováno v:
Phys. Rev. Appl. 21, 044050 (2024)
We investigate superradiant enhancements in the refrigeration performance of a set of $N$ three-level systems that are collectively coupled to a hot and a cold thermal reservoir and are additionally subject to collective periodic (circular) driving.
Externí odkaz:
http://arxiv.org/abs/2310.18126
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 hierarchy of correlations and compare different levels of accuracy. To lea
Externí odkaz:
http://arxiv.org/abs/2310.11216
We study how tunneling through a potential barrier $V(x)$ can be enhanced by an additional harmonically oscillating electric field ${\mathfrak E}(t)={\mathfrak E}_0\cos(\omega t)$. To this end, we transform into the Kramers-Henneberger frame and calc
Externí odkaz:
http://arxiv.org/abs/2309.12205
Autor:
Queisser, Friedemann, Schützhold, Ralf
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 harmonically oscillating electric field representing the pump laser. After d
Externí odkaz:
http://arxiv.org/abs/2309.01021
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 placed on the analogy to electron-positron pair creation from the vac
Externí odkaz:
http://arxiv.org/abs/2305.04895
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 different methods -- the hierarchy of correlations, strong-coupling p
Externí odkaz:
http://arxiv.org/abs/2304.03034
Autor:
Verlage, Jan, Queisser, Friedemann, Szpak, Nikodem, König, Jürgen, Kratzer, Peter, Schützhold, Ralf
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 insulator. Via the hierarchy of correlations, we derive and match the pr
Externí odkaz:
http://arxiv.org/abs/2303.13507
Publikováno v:
Phys. Rev. B 105, 115139 (2022)
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 bath. For cold baths at intermediate chemical potentials, the Mott insul
Externí odkaz:
http://arxiv.org/abs/2112.04956