Population inversion and dynamical phase transitions in a driven superconductor

H. P. Ojeda Collado; José Lorenzana; Gonzalo Usaj; C. A. Balseiro

doi:10.1103/PhysRevB.98.214519

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Population inversion and dynamical phase transitions in a driven superconductor

H. P. Ojeda Collado, José Lorenzana, Gonzalo Usaj, C. A. Balseiro

DOI 10.1103/PhysRevB.98.214519 · Physical Review B

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Abstract

We consider a superconductor in which the density of states at the Fermi level or the pairing interaction is driven periodically with a frequency larger than the superconducting gap in the collisionless regime. We show by numerical and analytical computations that a subset of quasiparticle excitations enter into resonance and perform synchronous Rabi oscillations leading to cyclic population inversion with a frequency that depends on the amplitude of the drive. As a consequence a different “Rabi-Higgs” mode emerges. Turning off the drive at different times and modulating the strength allows access to all known dynamical phases of the order parameter: persistent oscillations, oscillations with damping and overdamped dynamics. We discuss physical realizations of the drive and methods to detect the dynamics.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
NbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7	Pressure not reported	unknown
FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown