Photoinduced pseudospin-wave emission from charge-density-wave domain wall with superconductivity

We study photoinduced dynamics triggered by an inhomogeneity due to competition between charge density waves (CDWs) and superconductivity. As a simple example, we consider the superconducting (SC) interface between two CDW domains with opposite signs. The real-time dynamics are calculated within the...

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Bibliographic Details
Published in:arXiv.org 2023-01
Main Authors: Matsubayashi, Yukihiro, Masaki, Yusuke, Matsueda, Hiroaki
Format: Article
Language:English
Subjects:
Antiferromagnetism
Charge density waves
Distribution functions
Domain walls
Dynamics
Elementary excitations
Emission analysis
Inhomogeneity
Magnetic domains
Magnons
Mathematical analysis
Order parameters
Real time
Response functions
Superconductivity
Time dependence
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Summary:We study photoinduced dynamics triggered by an inhomogeneity due to competition between charge density waves (CDWs) and superconductivity. As a simple example, we consider the superconducting (SC) interface between two CDW domains with opposite signs. The real-time dynamics are calculated within the time-dependent Hartree--Fock--Bogoliubov framework, where the order parameter dynamics and the nonequilibrium quasiparticle distribution functions are studied. We also calculate the various dynamical response functions within a generalized random phase approximation. Through comparisons between the real time dynamics and the analysis of the response functions, it is found that the photo-driven SC interface can emit collective modes of the SC order parameter. This is analogous to the spin wave emission from the magnetic domain wall in an antiferromagnet, particularly in the case of a low driving frequency, where the order parameters can be mapped onto the pseudospin picture. In the high-frequency case, we find a domain wall melting caused by changes in the quasiparticle distribution, which induces superconductivity in the whole system.
ISSN:2331-8422