Zobrazeno 1 - 10
of 53
pro vyhledávání: '"Kohlfürst, Christian"'
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
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:
Kohlfürst, Christian
We discuss the Heisenberg-Wigner phase-space formalism in quantum electrodynamics as well as scalar quantum electrodynamics with respect to transverse fields. In regard to the special characteristics of such field types we derive modified transport e
Externí odkaz:
http://arxiv.org/abs/2212.06057
Autor:
Kohlfürst, Christian
We study electron-positron pair production within two counter-propagating, circularly polarized electromagnetic fields through the Wigner formalism. We numerically generate high-resolution momentum maps to perform a detailed spectroscopic analysis. W
Externí odkaz:
http://arxiv.org/abs/2212.03180
Particle production through ultra-strong electric fields is a well-studied research field. Nevertheless, despite repeated attempts to relate the production rate within the field to the formation time of a particle, the latter is still shrouded in mys
Externí odkaz:
http://arxiv.org/abs/2211.07510
Via a combination of analytical and numerical methods, we study electron-positron pair creation by the electromagnetic field ${\bf A}(t,{\bf r})=[f(ct-x)+f(ct+x)]{\bf e}_y$ of two colliding laser pulses. Employing a generalized WKB approach, we find
Externí odkaz:
http://arxiv.org/abs/2107.08741
The quantum vacuum shows an intensity-dependent nonlinear index of refraction. Consequently, we may consider vacuum as a non-linear medium enabling, at sufficiently high field strengths, a direct interaction of light with light. In this context, we a
Externí odkaz:
http://arxiv.org/abs/2105.08006
Publikováno v:
Phys. Rev. Research 3, 033153 (2021)
We study the enhancement of tunneling through a potential barrier $V(x)$ by a time-dependent electric field with special emphasis on pulse-shaped vector potentials such as $A_x(t)=A_0/\cosh^2(\omega t)$. In addition to the known effects of pre-accele
Externí odkaz:
http://arxiv.org/abs/2102.07474
Publikováno v:
Phys. Rev. D 101, 096009 (2020)
Electron-positron pair production for inhomogeneous electric and magnetic fields oscillating in space and time is investigated. By employing accurate numerical methods (Furry-picture quantization and quantum kinetic theory), final particle momentum s
Externí odkaz:
http://arxiv.org/abs/1912.09924