研究目的
To describe the nonequilibrium state of a superconductor after the impact of an ultrashort laser pulse, focusing on the relaxation stages and the suppression of the order parameter by excess quasiparticles.
研究成果
The developed theoretical model successfully describes the nonequilibrium state of a superconductor post ultrashort laser pulse impact, highlighting the stages of quasiparticle generation, energy relaxation, and the restoration of the superconducting order parameter. The model demonstrates the significant role of excess quasiparticles in suppressing superconductivity and the effect of laser pulse parameters on this process.
研究不足
The model does not account for electron-electron interaction and the dynamics of the superconducting state with current. The simulation uses a finite momentum lattice, which may affect the accuracy of the particle spectrum representation.
1：Experimental Design and Method Selection:
The study uses a theoretical model based on the nonequilibrium distribution function of phonons and quasiparticles on a finite momentum lattice for numerical simulation. The BCS theory is applied to describe the superconductor qualitatively.
2：Sample Selection and Data Sources:
The simulation is performed on a lattice of 16 × 16 × 16 momenta, with parameters such as Fermi energy, Fermi momentum, Debye temperature, initial width of the energy gap, and lifetimes of quasiparticles and phonons specified.
3：List of Experimental Equipment and Materials:
The study is theoretical and does not specify physical equipment or materials.
4：Experimental Procedures and Operational Workflow:
The simulation involves solving a system of kinetic equations for the nonequilibrium distribution function of phonons and quasiparticles, considering the absorption of an optical pulse, interaction with acoustic phonons, and the finite lifetime of quasiparticles and phonons.
5：Data Analysis Methods:
The numerical solution of the formulated equations allows observing the stages of the process, including optical generation of quasiparticles, relaxation of absorbed energy, and dynamic equilibrium between subsystems.
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