A5031449556- Laser-Matter Interactions and Applications
- Advanced Chemical Physics Studies
- Spectroscopy and Quantum Chemical Studies
- Mass Spectrometry Techniques and Applications
- Advanced Fiber Laser Technologies
- Atomic and Molecular Physics
- Laser-Plasma Interactions and Diagnostics
- Quantum optics and atomic interactions
- Spectroscopy and Laser Applications
- Quantum Information and Cryptography
- Laser Design and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Frequency and Time Standards
- Photoreceptor and optogenetics research
- Atomic and Subatomic Physics Research
- Ion-surface interactions and analysis
- Quantum Mechanics and Applications
- Mechanical and Optical Resonators
- Quantum, superfluid, helium dynamics
- Metaheuristic Optimization Algorithms Research
- Atmospheric Ozone and Climate
- Advanced Multi-Objective Optimization Algorithms
- Optical Network Technologies
- Advanced Fluorescence Microscopy Techniques
- Evolutionary Algorithms and Applications
East China Normal University
2020-2025
Ministry of Industry and Information Technology
2022-2025
Shanxi University of Traditional Chinese Medicine
2021-2025
Nanjing University of Aeronautics and Astronautics
2022-2025
Shanxi University
2021-2024
Civil Aviation University of China
2022-2024
New York University Shanghai
2022-2023
TU Wien
2019-2022
ORCID
2021
Max Planck Institute for the Physics of Complex Systems
2016-2018
We determine the ionization time in tunneling by an elliptically polarized light pulse relative to its maximum. This is achieved a full quantum propagation of electron wave function forward time, followed classical backpropagation identify parameters, particular, fraction electrons that has tunneled out. find close zero for single active helium and hydrogen if large. expect our analysis be essential quantify times correlated motion.
We investigate tunneling ionization of a single active electron with strong and short laser pulse, circularly polarized. With the recently proposed backpropagation method, we can compare different criteria for tunnel exit as well popular approximations in strong-field physics on same footing. Thereby, trace back discrepancies literature regarding time to inconsistent criteria. The main source error is use static potential, which is, however, dependent pulse. A vanishing velocity...
A technique for timing the photoemission from a molecule shows an attosecond-scale delay of electron wave packet opposite ends molecule, thus demonstrating new tool exploring photoelectron dynamics.
Interaction of a strong laser pulse with matter transfers not only energy but also linear momentum the photons. Recent experimental advances have made it possible to detect small amount delivered photoelectrons in strong-field ionization atoms. We present numerical simulations as well an analytical description subcycle phase (or time) resolved transfer atom accessible by attoclock protocol. show that light-field-induced is remarkably sensitive properties ultrashort such its carrier-envelope...
Attosecond chronoscopy is central to the understanding of ultrafast electron dynamics in matter from gas condensed phase with attosecond temporal resolution. It has, however, not yet been possible determine timing individual partial waves, and steering their contribution has a substantial challenge. Here, we develop polarization-skewed serving as wave meter reveal role each angle-resolved photoionization shifts rare atoms. We steer relative ratio between different waves realize...
We investigate tunneling ionization of a model helium atom in strong circularly polarized short laser pulse using the classical backpropagation method and compare ten different criteria on same footing, aiming for consistent picture dynamics. These are categorized into velocity-based, position-based, energy-based according to notions tunnel exit. find that velocity-based give exit characteristics with nonadiabatic effects fully included. Other either inconsistent or only able include...
We experimentally and theoretically investigate the influence of magnetic component an electromagnetic field on high-order above-threshold ionization xenon atoms driven by ultrashort femtosecond laser pulses. The nondipole shift electron momentum distribution along light-propagation direction for high energy electrons beyond 2U_{p} classical cutoff is found to be vastly different from that below this cutoff, where U_{p} ponderomotive potential driving field. A local minimum structure in...
We theoretically investigate the deformation of atomic p_{±} orbitals driven by strong elliptically polarized (EP) laser fields and role it plays in tunnel ionization. Our study reveals that different Stark effects induced orthogonal components EP field give rise to subcycle rearrangement bound electron density, rendering initial p_{+} p_{-} deformed along distinctively tilted angles with respect polarization ellipse field. As a consequence, instantaneous tunneling rates change such for...
Multiphoton resonant excitation and frustrated tunneling ionization, manifesting the photonic optical nature of driving light via direct electron recapture, respectively, are complementary mechanisms to access Rydberg state (RSE) atoms molecules in an intense laser field. However, clear identification manipulation their individual contributions light-induced RSE process remain experimentally challenging. Here, we bridge this gap by exploring dissociative nondissociative H2 using bicircular...
The realization of spatiotemporal vortex structure various physical fields with transverse orbital angular momentum (OAM) has attracted much attention and is expected to expand the research scope open new opportunities in their respective fields. Here we present theoretically first, best our knowledge, study on generation attosecond pulse trains featuring a optical (STOV) by two-color femtosecond light field, each color carrying OAM. Through careful optimization relative phase intensity...
An ultrafast intense laser field is one of the most important tools to observe and manipulate electronic nuclear dynamics with subcycle precision in highly nonlinear light–matter interactions, which provides access attosecond chemistry physics. In this review, we briefly summarize protocol chronoscopy its application probing photoemission from atoms molecules. We also review control schemes electron motion molecules as well molecular bond formation cleavage assistance tailored femtosecond fields.
Abstract The formation of carbon-hydrogen (C-H) bonds via the reaction small inorganic molecules is great significance for understanding fundamental transition from to organic matter, and thus origin life. Yet, detailed mechanism C-H bond formation, particularly time scale molecular-level control dynamics, remain elusive. Here, we investigate light-induced bimolecular starting a van der Waals molecular dimer composed two molecules, H 2 CO. Employing microscopy driven by tailored two-color...
Exploiting the infinite-order continuous dynamical rotational symmetry of circularly or elliptically polarized classical light pulses, we establish conservation law between angular momentum and energy in strong-field ionization that is applicable at subcycle level. We illustrate through correlated spectrum photoelectrons, both tunnel exit asymptotic region. Moreover, propose a protocol based on electron vortices to directly visualize existence law. Our work paves pathway toward deeper...
We present results of ab initio numerical simulations time delays in two-photon ionization the helium atom using attosecond streaking technique. The temporal shifts traces consist two contributions, namely, a delay acquired during absorption photons from extreme-ultraviolet field and accumulated by photoelectron after photoabsorption. In case nonresonant transition, is found to occur without delay. contrast, for resonant transition substantial found, which scales linearly with duration...
Abstract Rabi oscillation is an elementary laser-driven physical process in atoms and artificial from solid-state systems, while it rarely demonstrated molecules. Here, we investigate the bond-length-dependent oscillations with varying frequencies strong-laser-field dissociation of H 2 + . The coupling bond stretching makes nuclei gain different kinetic energies electron alternatively absorbing emitting photons. resulting proton energy spectra show rich structures beyond prediction Floquet...
We demonstrate that dissociative ionization of H_{2} can be fully manipulated in an angle-time-resolved fashion, employing a polarization-skewed (PS) laser pulse which the polarization vector rotates. The leading and falling edges PS pulse, characterized by unfolded field polarization, trigger, sequentially, parallel perpendicular transitions stretching molecules, respectively. These result counterintuitive proton ejections deviate significantly from directions. Our findings reaction...
Recent advances in laser technology have enabled tremendous progress light-induced molecular reactions, at the heart of which breaking and formation chemical bonds are located. Such has been greatly facilitated by development an accurate quantum-mechanical simulation method, which, however, does not necessarily accompany clear dynamical scenarios is rather computationally heavy. Here, we develop a wave-packet surface propagation (WASP) approach to describe bond-breaking dynamics from hybrid...
We apply a fundamental definition of time delay, as the difference between particle spends within finite region potential and free in same region, to determine results for photoionization an electron by extreme ultraviolet laser field using numerical simulations on grid. Our are good agreement with those Wigner-Smith obtained derivative phase shift scattering wave packet respect its energy, short-range Yukawa potential. In case Coulomb we obtain delays any while---as expected---the do not...