266 citations · 1.5k across the 48 of their papers we have counts for
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Quantum geometry in many-body systems with precursors of criticality
Jan Střeleček, Pavel Cejnar
We analyze the geometry of the ground-state manifold in parameter-dependent many-body systems with quantum phase transitions (QPTs) and describe finite-size precursors of the singu…
Excited-state quantum phase transitions in constrained systems
Jakub Novotný, Pavel Stránský, Pavel Cejnar
We extend the standard semiclassical theory of Excited-State Quantum Phase Transitions (ESQPTs), based on a classification of stationary points in the classical Hamiltonian, to con…
Unitary death of Schrödinger's cat
Pavel Stránský, Pavel Cejnar, Radim Filip
We analyze dynamics of the Rabi model describing interactions of a qubit with a single soft-mode oscillator. We show that the model with a slightly violated parity generates symmet…
Driving of an open quantum system at finite temperature across first- and second-order quantum phase transitions
Felipe Matus, Pavel Cejnar
An open fully connected system of qubits at nonzero temperature is driven within a finite time interval along various paths in the space of its control parameters. The driving lead…