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• W3100233257 startingPage "044708" @default.
• W3100233257 abstract "Photoinduced charge dynamics in dimerized systems is studied on the basis of the exact diagonalization method and the time-dependent Schrodinger equation for a one-dimensional spinless-fermion model at half filling and a two-dimensional model for $kappa$-(bis[ethylenedithio]tetrathiafulvalene)$_2$X [$kappa$-(BEDT-TTF)$_2$X] at three-quarter filling. After the application of a one-cycle pulse of a specifically polarized electric field, the charge densities at half of the sites of the system oscillate in the same phase and those at the other half oscillate in the opposite phase. For weak fields, the Fourier transform of the time profile of the charge density at any site after photoexcitation has peaks for finite-sized systems that correspond to those of the steady-state optical conductivity spectrum. For strong fields, these peaks are suppressed and a new peak appears on the high-energy side, that is, the charge densities mainly oscillate with a single frequency, although the oscillation is eventually damped. In the two-dimensional case without intersite repulsion and in the one-dimensional case, this frequency corresponds to charge-transfer processes by which all the bonds connecting the two classes of sites are exploited. Thus, this oscillation behaves as an electronic breathing mode. The relevance of the new peak to a recently found reflectivity peak in $kappa$-(BEDT-TTF)$_2$X after photoexcitation is discussed." @default.
• W3100233257 created "2020-11-23" @default.
• W3100233257 creator A5090989980 @default.
• W3100233257 date "2018-04-15" @default.
• W3100233257 modified "2023-09-26" @default.
• W3100233257 title "Photoinduced High-Frequency Charge Oscillations in Dimerized Systems" @default.
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• W3100233257 doi "https://doi.org/10.7566/jpsj.87.044708" @default.
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