Zobrazeno 1 - 10
of 162
pro vyhledávání: '"Igloi, Ferenc"'
Autor:
Iglói, Ferenc, Király, Csaba
We use entanglement witnesses related to the entanglement negativity of the state to detect entanglement in the $XY$ chain in the postquench states in the thermodynamic limit after a quench when the parameters of the Hamiltonian are changed suddenly.
Externí odkaz:
http://arxiv.org/abs/2403.07897
The $q$-state Potts chain with ferromagnetic couplings, $J=1$, in the presence of a transverse field, $\Gamma$, has a quantum phase transition at $\Gamma/q=1$, which is continuous for $q \le 4$ and of first order for $q>4$. Here we introduce a $q$-pe
Externí odkaz:
http://arxiv.org/abs/2306.09127
Publikováno v:
Condensed Matter Physics, 2023, vol. 26, No. 1, 13102
Motivated by the compound ${\rm LiHo}_x{\rm Y}_{1-x}{\rm F}_4$, we consider the Ising chain with random couplings and in the presence of simultaneous random transverse and longitudinal fields, and study its low-energy properties at zero temperature b
Externí odkaz:
http://arxiv.org/abs/2210.09380
Autor:
Iglói, Ferenc, Tóth, Géza
Publikováno v:
Phys. Rev. Research 5, 013158 (2023)
We use entanglement witnesses to detect entanglement in the XY chain in thermal equilibrium and determine the temperature bound below which the state is detected as entangled. We consider the entanglement witness based on the Hamiltonian. Such a witn
Externí odkaz:
http://arxiv.org/abs/2207.04842
Using combinatorial optimisation techniques we study the critical properties of the two- and the three-dimensional Ising model with uniformly distributed random antiferromagnetic couplings $(1 \le J_i \le 2)$ in the presence of a homogeneous longitud
Externí odkaz:
http://arxiv.org/abs/2206.03363
Autor:
Kovács, István A., Iglói, Ferenc
In many-body systems with quenched disorder, dynamical observables can be singular not only at the critical point, but in an extended region of the paramagnetic phase as well. These Griffiths singularities are due to rare regions, which are locally i
Externí odkaz:
http://arxiv.org/abs/2201.07074
Publikováno v:
Phys. Rev. Research 3, 033140 (2021)
In random quantum magnets, like the random transverse Ising chain, the low energy excitations are localized in rare regions and there are only weak correlations between them. It is a fascinating question whether these correlations are completely irre
Externí odkaz:
http://arxiv.org/abs/2103.05459
Publikováno v:
Phys. Rev. E 103, 052103 (2021)
In photosynthetic organisms, the energy of light during illumination is absorbed by the antenna complexes, which is transmitted by excitons and is either absorbed by the reaction centers (RCs), which have been closed in this way, or emitted by fluore
Externí odkaz:
http://arxiv.org/abs/2101.05517
Autor:
Lajkó, Péter, Iglói, Ferenc
Publikováno v:
Phys. Rev. B 103, 174404 (2021)
The antiferromagnetic quantum Ising chain has a quantum critical point which belongs to the universality class of the transverse Ising model (TIM). When a longitudinal field ($h$) is switched on, the phase transition is preserved, which turns to firs
Externí odkaz:
http://arxiv.org/abs/2012.07470
Publikováno v:
Scientific Reports | (2020) 10:14012
Antenna systems serve to absorb light and to transmit excitation energy to the reaction center (RC) in photosynthetic organisms. As the emitted (bacterio)chlorophyll fluorescence competes with the photochemical utilization of the excitation, the meas
Externí odkaz:
http://arxiv.org/abs/2008.05779