Nonequilibrium Quasiparticle Dynamics in a MoRe-Based Superconducting Resonator under IR Excitation

• URL: http://arxiv.org/abs/2511.23090v1
• Date: Fri, 28 Nov 2025 11:22:49 GMT
• Title: Nonequilibrium Quasiparticle Dynamics in a MoRe-Based Superconducting Resonator under IR Excitation
• Authors: O. A. Kalenyuk, S. I. Futimsky, I. A. Martynenko, A. P. Shapovalov, O. O. Boliasova, V. I. Shnyrkov, A. L. Kasatkin, A. A. Kordyuk,
• Abstract summary: Device exhibits a pronounced nonlinear response dominated by nonequilibrium quasiparticle dynamics.<n>Infrared pulses produce strong distortions of the resonance curve and a transient decrease in the resonance frequency.<n>Results highlight the relevance of nonequilibrium processes in MoRe and confirm its potential for microwave kinetic-inductance detector applications.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The response of a MoRe-based superconducting resonator operating near 5 K to pulsed infrared irradiation is investigated, and the underlying physical mechanisms are analyzed. The device exhibits a pronounced nonlinear response dominated by nonequilibrium quasiparticle dynamics rather than uniform thermal heating. Infrared pulses produce strong distortions of the resonance curve and a transient decrease in the resonance frequency, consistent with increased kinetic inductance caused by quasiparticle generation. The frequency shift scales approximately linearly with absorbed power, whereas the dissipation response saturates at higher powers, indicating the formation of a nonequilibrium steady-state quasiparticle population. These observations demonstrate a transition from a linear pair-breaking regime to a saturated dissipation regime, likely associated with a quasiparticle relaxation bottleneck or partial suppression of the smaller superconducting gap in MoRe. The results highlight the relevance of nonequilibrium processes in MoRe and confirm its potential for microwave kinetic-inductance detector applications.

Related papers

• Bose condensation and Bogoliubov excitation in resonator-embedded superconducting qubit network [53.72731614116211]
  Superconducting qubit networks (SQNs) embedded in a low-dissipative resonator are a promising device.<n>A quantum ac Stark effect provides by coupling between an SQN and microwave photons of a resonator, leads to a strong nonlinear interaction between photons.
  arXiv  Detail & Related papers  (2026-01-21T15:43:43Z)
• TLS-induced thermal nonlinearity in a micro-mechanical resonator [0.0]
  We present experimental evidence of a thermally-driven amplitude-frequency nonlinearity in a thin-film quartz phononic crystal resonator at millikelvin temperatures.<n>The nonlinear response arises from the coupling of the mechanical mode to an ensemble of microscopic two-level system defects driven out of equilibrium by a microwave drive.
  arXiv  Detail & Related papers  (2025-12-31T00:55:41Z)
• Nonequilibrium nonlinear response theory of amplitude-dependent dissipative conductivity in disordered superconductors [0.0]
  This work investigates amplitude-dependent nonlinear corrections to the dissipative conductivity in superconductors.<n>Our results provide microscopic insight into amplitude-dependent dissipation at frequencies well below ( Delta )
  arXiv  Detail & Related papers  (2025-09-11T18:00:02Z)
• Probing excited-state dynamics of transmon ionization [47.00361052400629]
  We study the excited-state dynamics induced by strong drives during readout in circuit QED.<n>With up to 10 resolvable states, we quantify the critical photon number of ionization, the resulting state after ionization, and the fraction of the population transferred to highly excited states.
  arXiv  Detail & Related papers  (2025-05-01T16:28:03Z)
• Nonlinear dynamical Casimir effect and Unruh entanglement in waveguide QED with parametrically modulated coupling [83.88591755871734]
  We study theoretically an array of two-level qubits moving relative to a one-dimensional waveguide. When the frequency of this motion approaches twice the qubit resonance frequency, it induces parametric generation of photons and excitation of the qubits. We develop a comprehensive general theoretical framework that incorporates both perturbative diagrammatic techniques and a rigorous master-equation approach.
  arXiv  Detail & Related papers  (2024-08-30T15:54:33Z)
• Instabilities near ultrastrong coupling in microwave optomechanical cavity [0.0]
  We experimentally realize a cavity-electromechanical device using a superconducting waveguide cavity and a mechanical resonator. In the presence of a strong pump, the mechanical-polaritons splitting can nearly reach 81% of the mechanical frequency, overwhelming all the dissipation rates.
  arXiv  Detail & Related papers  (2023-02-01T13:13:09Z)
• Probing the symmetry breaking of a light--matter system by an ancillary qubit [50.591267188664666]
  Hybrid quantum systems in the ultrastrong, and even more in the deep-strong, coupling regimes can exhibit exotic physical phenomena. We experimentally observe the parity symmetry breaking of an ancillary Xmon artificial atom induced by the field of a lumped-element superconducting resonator. This result opens a way to experimentally explore the novel quantum-vacuum effects emerging in the deep-strong coupling regime.
  arXiv  Detail & Related papers  (2022-09-13T06:14:08Z)
• Thermal self-oscillations in monolayer graphene coupled to a superconducting microwave cavity [58.720142291102135]
  We observe thermal self-oscillations in a monolayer graphene flake coupled to superconducting resonator. The experimental observations fit well with theoretical model based on thermal instability. The modelling of the oscillation sidebands provides a method to evaluate electron phonon coupling in disordered graphene sample at low energies.
  arXiv  Detail & Related papers  (2022-05-27T15:38:41Z)
• Dynamics of Transmon Ionization [94.70553167084388]
  We numerically explore the dynamics of a driven transmon-resonator system under strong and nearly resonant measurement drives. We find clear signatures of transmon ionization where the qubit escapes out of its cosine potential.
  arXiv  Detail & Related papers  (2022-03-21T18:00:15Z)
• Quantum theory of two-dimensional materials coupled to electromagnetic resonators [0.0]
  We present a microscopic quantum theory of light-matter interaction in pristine sheets of two-dimensional semiconductors coupled to localized electromagnetic resonators. The light-matter interaction breaks the translation symmetry of excitons in the two-dimensional lattice, and we find that this symmetry-breaking interaction leads to the formation of a localized exciton state. We quantify the influence of the environment and find that it is most pronounced for small lateral confinement length scales of the electromagnetic field in the resonator.
  arXiv  Detail & Related papers  (2021-03-26T14:25:57Z)
• Effect of phonons on the electron spin resonance absorption spectrum [62.997667081978825]
  We model the effect of phonons and temperature on the electron spin resonance (ESR) signal in magnetically active systems. We find that the suppression of ESR signals is due to phonon broadening but not based on the common assumption of orbital quenching.
  arXiv  Detail & Related papers  (2020-04-22T01:13:07Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.