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Comment on 'Revisiting the phase transitions of the Dicke model'
Ángel L. Corps, Armando Relaño
In the work of Das and Sharma [Phys. Rev. A 105, 033716 (2022)] the phase transitions of the Dicke model are studied. Its main result is that, besides the well-known quantum phase…
Dynamical and excited-state quantum phase transitions in collective systems
Ángel L. Corps, Armando Relaño
We study dynamical phase transitions (DPTs) in quantum many-body systems with infinite-range interaction, and present a theory connecting the two kinds of known DPTs (sometimes ref…
Theory of dynamical phase transitions in quantum systems with symmetry-breaking eigenstates
Ángel L. Corps, Armando Relaño
We present a theory for the two kinds of dynamical quantum phase transitions, termed DPT-I and DPT-II, based on a minimal set of symmetry assumptions. In the special case of collec…
Exceptional Spectral Phase in a Dissipative Collective Spin Model
Álvaro Rubio-García, Ángel L. Corps, Armando Relaño +4
We study a model of a quantum collective spin weakly coupled to a spin-polarized Markovian environment and find that the spectrum is divided into two regions that we name normal an…
Energy cat states induced by a parity-breaking excited-state quantum phase transition
Ángel L. Corps, Armando Relaño
We show that excited-state quantum phase transitions (ESQPTs) in a system in which the parity symmetry is broken can be used to engineer an energy-cat state -- a Schrödinger cat st…