First-principles electron dynamics calculations can be applied in the investigation of a wide range of ultrafast phenomena in attosecond physics.They offer unique microscopic insight into light-induced ultrafast pheno...First-principles electron dynamics calculations can be applied in the investigation of a wide range of ultrafast phenomena in attosecond physics.They offer unique microscopic insight into light-induced ultrafast phenomena in both gas and condensed phases of matter,and thus,they are apowerful tool to develop our understanding of the physics of attosecond phenomena.We specifically review techniques employing time-dependent density functional theory(TDDFT)for investigating attosecond and strong-field phenomena.First,we describe this theoretical framework that enables the modeling of perturbative and non-perturbative electron dynamics in materials,including atoms,molecules,and solids.We then discuss its application to attosecond experiments,focusing on the reconstruction of attosecond beating by interference of two-photon transitions(RABBIT)measurements.Wealso briefly review first-principles calculations of optical properties of solids with TDDFT in the linear response regime and their extension to calculations of transient optical properties of solids in non-equilibrium phases,by simulating experimental pump-probe setups.We further demonstrate the application of TDDFT simulation to high-order harmonic generation in solids.First-principles calculations have predictive power,and hence they can be utilized to design future experiments to explore nonequilibrium and nonlinear ultrafast phenomena in matter and characterize and control metastable light-induced quantum states.展开更多
In this review,we will focus on recent progress on the investigations of nondipole effects in few-electron atoms and molecules interacting with light fields.We first briefly survey several popular theoretical methods ...In this review,we will focus on recent progress on the investigations of nondipole effects in few-electron atoms and molecules interacting with light fields.We first briefly survey several popular theoretical methods and relevant concepts in strong field and attosecond physics beyond the dipole approximation.Physical phenomena stemming from the breakdown of the dipole approximation are then discussed in various topics,including the radiation pressure and photon-momentum transfer,the atomic stabilization,the dynamic interference,and the high-order harmonic generation.Whenever available,the corresponding experimental observations of these nondipole effects are also introduced respectively in each topics.展开更多
We calculate the time-energy distribution(TED)and ionization time distribution(ITD)of photoelectrons emitted by a doubleextreme-ultraviolet(XUV)pulse and a two-color XUV-IR pulse using the Wigner distribution-like fun...We calculate the time-energy distribution(TED)and ionization time distribution(ITD)of photoelectrons emitted by a doubleextreme-ultraviolet(XUV)pulse and a two-color XUV-IR pulse using the Wigner distribution-like function based on the strong field approximation.For a double-XUV pulse,besides two identical broad distributions generated by two XUV pulses,many interference fringes resulting from the interference between electrons generated,respectively,by two pulses appear in the TED.After adding an IR field,the TED intuitively exhibits the effect of the IR field on the electron dynamics.The ITDs during two XUV pulses are no longer the same and show the different changes for the different two-color fields,the origin of which is attributed to the change of the electric field induced by the IR field.Our analysis shows that the emission time of electrons ionized during two XUV pulses mainly depends on the electric field of the combined XUV pulse and IR pulse.展开更多
基金supported by JSPS KAKENHI Grant Numbers JP20K14382 and JP21H01842the Cluster of Excellence 'CUI: Advanced Imaging of Matter'- EXC 2056 - project ID 390715994+5 种基金SFB-925 "Light induced dynamics and control of correlated quantum systems" – project 170620586 of the Deutsche Forschungsgemeinschaft (DFG)the Max Planck-New York City Center for Non-Equilibrium Quantum PhenomenaThis work was also supported by MEXT Promotion of Development of a Joint Usage/ Research System Project: Coalition of Universities for Research Excellence Program (CURE) Grant Number JPMXP1323015474We also acknowledge support from the Marie Sk{\l}odowska- Curie Doctoral Network TIMES, grant No. 101118915, and SPARKLE grant No. 101169225the Italian Ministry of University and Research (MUR) under the PRIN 2022 Grant No 2022PX279E_003Next Generation EUPartenariato Esteso NQSTI - Spoke 2 (THENCE-PE00000023). The Flatiron Institute is a division of the Simons Foundation. This work used computational resources of the HPC systems at the Max Planck Computing and Data Facility (MPCDF), and the Fujitsu PRIMERGY CX400M1/CX2550M5 (Oakbridge-CX) at the Information Technology Center, the University of Tokyo through the HPCI System Research Project (Project ID:hp220112).
文摘First-principles electron dynamics calculations can be applied in the investigation of a wide range of ultrafast phenomena in attosecond physics.They offer unique microscopic insight into light-induced ultrafast phenomena in both gas and condensed phases of matter,and thus,they are apowerful tool to develop our understanding of the physics of attosecond phenomena.We specifically review techniques employing time-dependent density functional theory(TDDFT)for investigating attosecond and strong-field phenomena.First,we describe this theoretical framework that enables the modeling of perturbative and non-perturbative electron dynamics in materials,including atoms,molecules,and solids.We then discuss its application to attosecond experiments,focusing on the reconstruction of attosecond beating by interference of two-photon transitions(RABBIT)measurements.Wealso briefly review first-principles calculations of optical properties of solids with TDDFT in the linear response regime and their extension to calculations of transient optical properties of solids in non-equilibrium phases,by simulating experimental pump-probe setups.We further demonstrate the application of TDDFT simulation to high-order harmonic generation in solids.First-principles calculations have predictive power,and hence they can be utilized to design future experiments to explore nonequilibrium and nonlinear ultrafast phenomena in matter and characterize and control metastable light-induced quantum states.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11961131008,11725416,and 11574010)the National Key Research and Development Program of China(Grant No.2018YFA0306302)
文摘In this review,we will focus on recent progress on the investigations of nondipole effects in few-electron atoms and molecules interacting with light fields.We first briefly survey several popular theoretical methods and relevant concepts in strong field and attosecond physics beyond the dipole approximation.Physical phenomena stemming from the breakdown of the dipole approximation are then discussed in various topics,including the radiation pressure and photon-momentum transfer,the atomic stabilization,the dynamic interference,and the high-order harmonic generation.Whenever available,the corresponding experimental observations of these nondipole effects are also introduced respectively in each topics.
基金partially supported by the National Key Research and Development Program of China(Nos.2019YFA0307700and 2016YFA0401100)the National Natural Science Foundation of China(NSFC)(Nos.11774361,11775286,11804405,and 12047576)。
文摘We calculate the time-energy distribution(TED)and ionization time distribution(ITD)of photoelectrons emitted by a doubleextreme-ultraviolet(XUV)pulse and a two-color XUV-IR pulse using the Wigner distribution-like function based on the strong field approximation.For a double-XUV pulse,besides two identical broad distributions generated by two XUV pulses,many interference fringes resulting from the interference between electrons generated,respectively,by two pulses appear in the TED.After adding an IR field,the TED intuitively exhibits the effect of the IR field on the electron dynamics.The ITDs during two XUV pulses are no longer the same and show the different changes for the different two-color fields,the origin of which is attributed to the change of the electric field induced by the IR field.Our analysis shows that the emission time of electrons ionized during two XUV pulses mainly depends on the electric field of the combined XUV pulse and IR pulse.
