122 citations · 328 across the 12 of their papers we have counts for
12 papers
Continuum analogues of excited-state quantum phase transitions
Pavel Stránský, Milan Šindelka, Pavel Cejnar
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 co…
Excited-state quantum phase transitions
Pavel Cejnar, Pavel Stránský, Michal Macek +1
We review the effects of excited-state quantum phase transitions (ESQPTs) in interacting many-body systems with finite numbers of collective degrees of freedom. We classify typical…
Quasiclassical approach to quantum quench dynamics in the presence of an excited-state quantum phase transition
Michal Kloc, Daniel Šimsa, Filip Hanák +3
The dynamics of a quantum system following a sudden, highly non-adiabatic change of its control parameter (quantum quench) is studied with quasiclassical techniques. Recent works h…
Superradiance in finite quantum systems randomly coupled to continuum
Pavel Stránský, Pavel Cejnar
We study the effect of superradiance in open quantum systems, i.e., the separation of short- and long-living eigenstates when a certain subspace of states in the Hilbert space acqu…
Excited-state quantum phase transitions in systems with two degrees of freedom: III. Interacting boson systems
Michal Macek, Pavel Stránský, Amiram Leviatan +1
The series of articles [Ann. Phys. 345, 73 (2014) and 356, 57 (2015)] devoted to excited-state quantum phase transitions (ESQPTs) in systems with degrees of freedom is contin…
Order, Chaos and (Quasi-) Dynamical Symmetries across 1st-order Quantum Phase Transitions in Nuclei
Michal Macek, Pavel Cejnar, Pavel Stránský +2
First order quantum phase transition (QPT) between spherical and axially deformed nuclei shows coexisting, but well-separated regions of regular and chaotic dynamics. We employ a H…
Quantum quench dynamics in Dicke superradiance models
Michal Kloc, Pavel Stránský, Pavel Cejnar
We study the quantum quench dynamics in an extended version of the Dicke model where an additional parameter allows a smooth transition to the integrable Tavis-Cummings regime. We…
Monodromy in Dicke superradiance
Michal Kloc, Pavel Stránský, Pavel Cejnar
We study the focus-focus type of monodromy in an integrable version of the Dicke model. Classical orbits forming a pinched torus represent analogues of the dynamic superradiance un…
Heat capacity for systems with excited-state quantum phase transitions
Pavel Cejnar, Pavel Stránský
Heat capacities of model systems with finite numbers of effective degrees of freedom are evaluated using canonical and microcanonical thermodynamics. Discrepancies between both app…
Classification of excited-state quantum phase transitions for arbitrary number of degrees of freedom
Pavel Stránský, Pavel Cejnar
Classical stationary points of an analytic Hamiltonian induce singularities of the density of quantum energy levels and their flow with a control parameter in the system's infinite…
Understanding Chaos via Nuclei
Pavel Cejnar, Pavel Stránský
We use two models of nuclear collective dynamics - the geometric collective model and the interacting boson model - to illustrate principles of classical and quantum chaos. We prop…
Peres lattices in nuclear structure
Michal Macek, Pavel Stránský, Pavel Cejnar
A method by Peres is used to draw spectra of the interacting boson model as lattices in the plane of energy versus an arbitrary observable average (or variance). Ordered (disordere…