Charge Oscillations Emerging after Application of an Intense Light Field to Superconductors on a Dimer Lattice

Abstract

Motivated by recent experimental findings for an organic superconductor, charge oscillations that emerge after a strong pulse of an oscillating electric field is applied are studied in electron systems in a superconducting phase on a lattice with a dimerized structure. They are analyzed using Fourier spectra of charge densities whose time profiles are obtained by numerically solving the time-dependent Schrödinger equation within a mean-field approximation. Depending on the strengths of attractive interactions, different charge-oscillation modes appear. For weak attractions, the charge-oscillation mode is an electronic breathing mode, which was previously found for repulsive interactions. For strong attractions, it is a pair analog of the electronic breathing mode (a `pair' breathing mode). For intermediate attractions, it is another mode whose transient current distributions are considerably different from those of the breathing modes. We investigate how their frequencies and amplitudes depend on interactions and transfer integrals.

23 pages, 7 figures, accepted for publication in J. Phys. Soc. Jpn

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Cited by in corpus (5)

• High-harmonic generation by electric polarization, spin current, and magnetization
• Disorder Effects on the Origin of High-Order Harmonic Generation in Solids
• Analytical WKB theory for high-harmonic generation and its application to massive Dirac electrons
• Competition between Interactions and Randomness in Photoinduced Synchronization of Charge Oscillations on a Dimer Lattice
• Mechanism for Synchronization of Charge Oscillations in Dimer Lattices