Zobrazeno 1 - 10
of 331
pro vyhledávání: '"Schützhold, Ralf"'
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:
Evans, Stefan, Schützhold, Ralf
We study the interaction between axions and nuclei by combining the Peccei-Quinn mechanism with results from quantum chromo-dynamics (QCD) which imply that the QCD condensates are reduced within nuclear matter. Thus, the effective axion mass is also
Externí odkaz:
http://arxiv.org/abs/2404.12996
We consider a quantum system coupled to environment at a fixed temperature and describe the reduced evolution of the system by means of a Redfield equation with effective time-dependent contact temperature obeying a universal law. At early times, aft
Externí odkaz:
http://arxiv.org/abs/2403.10591
We consider a ring of fermionic quantum sites, modeled by the Fermi-Hubbard Hamiltonian, in which electrons can move and interact strongly via the Coulomb repulsion. The system is coupled to fermionic cold baths which by the exchange of particles and
Externí odkaz:
http://arxiv.org/abs/2311.06331
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
Autor:
Dreher, Pascal, Janoschka, David, Giessen, Harald, Schützhold, Ralf, Davis, Timothy J., Hoegen, Michael Horn-von, Heringdorf, Frank-J. Meyer zu
Publikováno v:
Nanophotonics, vol. 13, no. 9, 2024, pp. 1593-1602
Quantum path interferences occur whenever multiple equivalent and coherent transitions result in a common final state. Such interferences strongly modify the probability of a particle to be found in that final state, a key concept of quantum coherent
Externí odkaz:
http://arxiv.org/abs/2310.11936
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
Autor:
Brand, Christian, Hucht, Alfred, Mehdipour, Hamid, Jnawali, Giriraj, Fortmann, Jonas D., Tajik, Mohammad, Hild, Rüdiger, Sothmann, Björn, Kratzer, Peter, Schützhold, Ralf, Hoegen, Michael Horn-von
The critical behavior of the order-disorder phase transition in the buckled dimer structure of the Si(001) surface is investigated both theoretically by means of first-principles calculations and experimentally by spot profile analysis low-energy ele
Externí odkaz:
http://arxiv.org/abs/2310.10488
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