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pro vyhledávání: '"Sindelka, Milan"'
We study exceptional points (EPs) of a nonhermitian Hamiltonian $\hat{H}(\lambda,\delta)$ whose parameters $\lambda \in {\mathbb C}$ and $\delta \in {\mathbb R}$. As the real control parameter $\delta$ is varied, the $k$-th EP (or $k$-th cluster of s
Externí odkaz:
http://arxiv.org/abs/2212.14804
Publikováno v:
Phys. Rev. Lett. 131, 040401 (2023)
We consider the dynamics of a quantum system immersed in a dilute gas at thermodynamics equilibrium using a quantum Markovian master equation derived by applying the low-density limit technique. It is shown that the Gibbs state at the bath temperatur
Externí odkaz:
http://arxiv.org/abs/2211.03070
Autor:
Šindelka, Milan
The purpose of these lectures is to give an accessible and self contained introduction to quantum scattering theory in one dimension. Part A defines the theoretical playground, and develops basic concepts of scattering theory in the time domain (Asym
Externí odkaz:
http://arxiv.org/abs/2204.03651
Autor:
Šindelka, Milan
The purpose of these notes is to provide a pedagogical introduction to the concept of renormalization in atomic physics. We study quantum dynamics of a model of a nonrelativistic single electron atom coupled to the quantum radiation field in the dipo
Externí odkaz:
http://arxiv.org/abs/2204.02800
Autor:
Moiseyev, Nimrod, Sindelka, Milan
We show that the correspondence between quantum and classical mechanics can be tuned by varying the coupling strength between the cavity modes and an atom or a molecule. In the acceleration gauge the cavity-matter system is represented by an effectiv
Externí odkaz:
http://arxiv.org/abs/2202.06696
Publikováno v:
Phys. Rev. A 103, 062207 (2021)
Following our work [Phys. Rev. Lett. 125, 020401 (2020)], we discuss a semiclassical description of one-dimensional quantum tunneling through multibarrier potentials in terms of complex time. We start by defining a complex-extended continuum level de
Externí odkaz:
http://arxiv.org/abs/2103.02495
Publikováno v:
Phys. Rev. Lett. 125, 020401 (2020)
We introduce a complex-extended continuum level density and apply it to one-dimensional scattering problems involving tunneling through finite-range potentials. We show that the real part of the density is proportional to a real "time shift" of the t
Externí odkaz:
http://arxiv.org/abs/2002.03874
We study theoretically the population transfer in two-level atoms driven by chirped lasers. It is known that in the Hermitian case, the rapid adiabatic passage (RAP) is stable for an above-critical chirp below which the final populations of states Ra
Externí odkaz:
http://arxiv.org/abs/1903.10383
Akademický článek
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Publikováno v:
Phys. Rev. A 95, 010103 (R) (2017)
A main distinguishing feature of non-Hermitian quantum mechanics is the presence of exceptional points (EPs). They correspond to the coalescence of two energy levels and their respective eigenvectors. Here, we use the Lipkin-Meshkov-Glick (LMG) model
Externí odkaz:
http://arxiv.org/abs/1612.02013