Zobrazeno 1 - 10
of 123
pro vyhledávání: '"Ordóñez, Gonzalo"'
Autor:
Rempfer, Benjamin, Ordonez, Gonzalo
We analytically model a one-dimensional lattice with periodic impurities representing a photonic crystal from first principles. We then investigate bound states in the continuum by computing the transmission and reflection coefficients. It turns out
Externí odkaz:
http://arxiv.org/abs/2410.05476
Autor:
Wanninger, Josh, Ordonez, Gonzalo
We simulated modifications to a model of a two-dimensional paramagnetic semiconductor called the half-BHZ model, also known as the QWZ model, and simulated a modified full BHZ model, where a time reversal pair is introduced. Our modifications to the
Externí odkaz:
http://arxiv.org/abs/2311.10853
Publikováno v:
J. Phys.: Conf. Ser. 2038, 012011 (2021)
We review some recent work on the occurrence of coalescing eigenstates at exceptional points in non-Hermitian systems and their influence on physical quantities. We particularly focus on quantum dynamics near exceptional points in open quantum system
Externí odkaz:
http://arxiv.org/abs/2108.04673
Publikováno v:
Phys. Rev. Research 3, 033029 (2021)
For a system consisting of a quantum emitter coupled near threshold (band edge) to a one-dimensional continuum with a van Hove singularity in the density of states, we demonstrate general conditions such that a characteristic triple level convergence
Externí odkaz:
http://arxiv.org/abs/2104.06929
Publikováno v:
Phys. Rev. A 103, 043513 (2021)
Spin-dependent charge transfer decay in an alkali atom doped polyacetylene is studied in terms of the complex spectral analysis, revealing the single-spin Zeeman splitting influenced by the spin-orbit interaction. Nonhermitian effective Hamiltonian h
Externí odkaz:
http://arxiv.org/abs/2012.14655
Autor:
Hatano, Naomichi, Ordonez, Gonzalo
Publikováno v:
In 'Fano Resonances in Optics and Microwaves' eds. E. Kamenetskii, A. Sadreev, and A. Miroshnichenko, Chap. 15, pp. 357-382 (Springer Nature Switzerland, 2018)
We describe the Fano asymmetry by expanding the transmission amplitude with respect to states with point spectra (discrete eigenstates), including not only bound states but also resonant states with complex eigenvalues. We first introduce a novel com
Externí odkaz:
http://arxiv.org/abs/1905.12259
Autor:
Hatano, Naomichi, Ordonez, Gonzalo
Publikováno v:
Entropy 2019, Vol. 21, Issue 4, No. 380
It is one of the most important and long-standing issues of physics to derive the irreversibility out of a time-reversal symmetric equation of motion. The present paper considers the breaking of the time-reversal symmetry in open quantum systems and
Externí odkaz:
http://arxiv.org/abs/1903.05227
Publikováno v:
Phys. Rev. A 99, 010102 (2019)
We propose a methodical approach to controlling and enhancing deviations from exponential decay in quantum and optical systems by exploiting recent progress surrounding another subtle effect: the bound states in continuum, which have been observed in
Externí odkaz:
http://arxiv.org/abs/1808.04781
Autor:
Ordonez, Gonzalo, Hatano, Naomichi
Publikováno v:
J. Phys. A: Math. Theor. 50 (2017) 405304 (34pp)
Open quantum systems are often represented by non-Hermitian effective Hamiltonians that have complex eigenvalues associated with resonances. In previous work we showed that the evolution of tight-binding open systems can be represented by an explicit
Externí odkaz:
http://arxiv.org/abs/1610.01548
Autor:
Garmon, Savannah, Ordonez, Gonzalo
Publikováno v:
J. Math. Phys. 58, 062101 (2017)
It has been reported in the literature that the survival probability $P(t)$ near an exceptional point where two eigenstates coalesce should generally exhibit an evolution $P(t) \sim t^2 e^{-\Gamma t}$, in which $\Gamma$ is the decay rate of the coale
Externí odkaz:
http://arxiv.org/abs/1609.07718