- 标题
- 摘要
- 关键词
- 实验方案
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Photoinduced collective mode, inhomogeneity, and melting in a charge-order system
摘要： We theoretically investigate photoresponses of a correlated electron system upon stimuli of a pulsed laser light. Real-time dynamics of an interacting spinless fermion model on a one-dimensional chain, as a model of charge order (CO), are numerically simulated using the time-dependent Hartree-Fock method. In particular, we discuss the differences between two situations as the initial state: the homogeneous order and the presence of a domain wall, i.e., a kink structure embedded in the CO bulk. Coherent dynamics are seen in the former case: When the frequency of the pump light ωp is varied, along with single particle excitations across the CO gap (ΔCO), the resonantly-excited collective phase mode near ωp ≈ ΔCO/2 efficiently destabilizes CO. In clear contrast, in the latter case, when ωp is tuned at such in-gap frequencies and the intensity of light is sufficiently large, inhomogeneity spreads out from the kink to the bulk region through kink creations. Moreover, even stronger intensity induces the inhomogeneous melting of CO where the CO gap is destroyed.
关键词： photoinduced phase transition,charge order,collective mode,inhomogeneity,time-dependent Hartree-Fock method
更新于2025-09-23 15:23:52
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Ionization of hydrogen chloride in few-cycle intense laser pulses
摘要： The single ionization of HCl (X^1Σ^+) molecules in few-cycle intense laser pulses at 800 nm has been studied for laser intensities ranging from 2X 10^13 to 1.4X 10^14 W/cm^2. Total and partial ionization probabilities were computed in the framework of the time-dependent Hartree-Fock theory. The influence of the laser pulse duration and the carrier envelope phase on the HCl ionization was investigated.
关键词： time-dependent Hartree-Fock theory,molecular interactions with photons,single molecular ionization,multiphoton processes,intense-field molecular ionization
更新于2025-09-11 14:15:04
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Non-Markovian pure dephasing in a dielectric excited by a few-cycle laser pulse
摘要： We develop the theory of pure dephasing in a solid exposed to an ultrashort laser pulse beyond the commonly used Markov approximation. This approach takes into account the finite cutoff energy of the bath and can be applied to both many-particle and phonon environments. With numerical simulations performed with the time-dependent Hartree-Fock equations, we investigate how the excitation probability and high-harmonic generation are described by different models of decoherence. It is shown that the time-dependent rates allow for temporally high dephasing to successfully reproduce the main features of high-harmonics spectrum and avoid an overestimation of the charge carrier population after the pulse, which is a common problem of the Markov approximation.
关键词： pure dephasing,time-dependent Hartree-Fock,non-Markovian,ultrashort laser pulse,high-harmonic generation
更新于2025-09-11 14:15:04