Review
Physics, Multidisciplinary
Chao Chen, Jiayin Che, Xuejiao Xie, Shang Wang, Guoguo Xin, Yanjun Chen
Summary: Measuring and controlling electron motion in atoms and molecules through strong laser fields on the attosecond time scale is a frontier of atomic and molecular photophysics research. Recent studies have shown that the Coulomb potential can cause ionization time lag, significantly impacting electron dynamics and time-frequency properties of electron trajectory.
Article
Physics, Multidisciplinary
Yueming Zhou, Jia Tan, Min Li, Peixiang Lu
Summary: In this study, the property of the electron wave packet in tunneling ionization of molecules is investigated using a method based on strong-field photoelectron holography. The asymmetric behavior in the holographic interference with respect to the laser polarization direction is demonstrated, which is attributed to the nonzero initial transverse displacement of the electron wave packet at tunneling. This displacement, accurately retrieved through analyzing the holographic interference, is directly related to the electron density distribution in molecules and presents a novel concept for probing electronic structure in molecules.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2021)
Article
Computer Science, Interdisciplinary Applications
Shanshan Song, Mingyu Zhu, Hongcheng Ni, Jian Wu
Summary: Tunneling ionization is a key aspect of strong-field and attosecond science. This paper presents PyStructureFactor, a Python code that calculates the structure factor in the tunneling ionization rate of common molecules under intense laser fields. The code is based on the weak-field asymptotic theory and utilizes the PySCF quantum chemistry package to obtain the electronic structure information of the molecules. PyStructureFactor is a versatile computational framework that can compute the structure factor of various types of molecules and has been benchmarked against known results.
COMPUTER PHYSICS COMMUNICATIONS
(2023)
Article
Optics
Xiaodan Mao, Hongcheng Ni, Xiaochun Gong, Joachim Burgdoerfer, Jian Wu
Summary: This article investigates the linear momentum transfer in the interaction of strong laser pulses with matter. It is found that linear momentum transfer is a characteristic feature of laser-atom interaction. The decomposition of the subcycle time-resolved linear momentum transfer into its multipolar components reveals that the magnetic dipole contribution dominates the linear momentum transfer during the dynamical tunneling process, while the postionization longitudinal momentum transfer is primarily governed by the electric quadrupole interaction. Additionally, non-dipole momentum transfer effects, which scale linearly or quadratically with the coupling to the laser field, are identified using the radiation gauge.
Article
Physics, Multidisciplinary
Zhao Meng, Quan Wei, Xiao Zhi-Lei, Xu Song-Po, Wang Zhi-Qiang, Wang Ming-Hui, Cheng Si-Jin, Wu Wen-Zhuo, Wang Yan-Lan, Lai Xuan-Yang, Liu Xiao-Jun
Summary: In this study, the tunneling delay time in strong field ionization of atomic Ar was investigated using the attoclock experimental scheme. By comparing experimental and simulated results, an upper limit of 10 attoseconds for the tunneling delay time of Ar was derived, and the influence of various physical effects on the extracted tunneling delay time was analyzed.
ACTA PHYSICA SINICA
(2022)
Article
Optics
Peipei Xin, Tianhui Qiu, Libo Chen, Hongyang Ma, Hongping Liu
Summary: The study investigates the modulation structures of atomic Rydberg excitation in tunneling ionization, revealing that bound states with low principal quantum number dominate the total excitation probability and a well-defined parity angular momentum state contributes significantly under certain laser intensities. The Rydberg residual population effect of a rare-gas atom surviving from the laser field is elaborated, showing the presence of multiphoton resonance in the tunneling regime. Additionally, a physical scenario is established for the role of Rydberg atom radial size in ionization.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
S. Di Sabatino, J. Koskelo, J. A. Berger, P. Romaniello
Summary: By introducing electron screening, the band-gap opening in weakly as well as strongly correlated systems can be correctly described. This method has been applied to bulk LiH, Si, and paramagnetic as well as antiferromagnetic NiO, demonstrating its effectiveness. Although some incorrect features still exist in the full photoemission spectra, this result is significant for an ab-initio electronic structure method and paves the way for a unified description of photoemission spectra at weak and strong correlation.
Article
Materials Science, Multidisciplinary
Zhenbang Dai, Andrew M. Rappe
Summary: This article investigates the shift current and ballistic current in the photovoltaic effect and finds that the shift current exhibits a different behavior under strong magnetic field, undergoing a phase transition. This study aims to resolve the debate over the behavior of the photovoltaic effect under magnetic field and inspire further exploration of the relationship between nonlinear optics and quantum geometry.
Article
Materials Science, Multidisciplinary
Violeta M. Petrovic, Hristina S. Delibasic Markovic, Ivan D. Petrovic
Summary: This paper presents a novel theoretical model analyzing tunneling ionization for noble atoms exposed to an elliptically polarized laser field. By employing a semiclassical ensemble approximation, the model takes into account the impact of the dynamic Coulomb field and ionization potential. The incorporation of the Coulomb field effect significantly improves the agreement between theoretical predictions and experimental data. The study emphasizes the importance of ellipticity on the tunneling rate and confirms the applicability of the model.
RESULTS IN PHYSICS
(2023)
Article
Physics, Multidisciplinary
Jia-Yin Che, Chao Chen, Wei-Yan Li, Wei Li, Yan-Jun Chen
Summary: This study proposes a theory to resolve the response time problem in strong field atomic tunneling ionization and summarizes the research progress of this theory. The theory can explain experimental phenomena, be applied to different scenarios, and provide important guidance in attoclock experiments and HHG spectroscopic experiments.
ACTA PHYSICA SINICA
(2023)
Article
Physics, Multidisciplinary
A. Hartung, S. Brennecke, K. Lin, D. Trabert, K. Fehre, J. Rist, M. S. Schoeffler, T. Jahnke, L. Ph H. Schmidt, M. Kunitski, M. Lein, R. Doerner, S. Eckart
Summary: Strong-field ionization of atoms by circularly polarized femtosecond laser pulses results in a donut-shaped electron momentum distribution, which can be shifted forward by the magnetic non-dipole effect. In addition, there is an electric non-dipole effect causing changes in the radius of the distribution for different momentum directions.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Jia Tan, Shengliang Xu, Xu Han, Yueming Zhou, Min Li, Wei Cao, Qingbin Zhang, Peixiang Lu
Summary: The relative contributions of quantum orbits during tunneling ionization induced by intense laser pulses are crucial for exploring the phenomenon and applications of tunneling. A combined experimental and theoretical study was conducted to identify these contributions, providing insights for interpreting and utilizing tunneling ionization in atoms and molecules.
ADVANCED PHOTONICS
(2021)
Article
Optics
B. Fetic, M. Tunja, W. Becker, D. B. Milosevic
Summary: This paper investigates two alternative methods for extracting the photoelectron spectrum (PES) from time-dependent wave-function calculations and compares them with the exact method. The methods involve projecting the wave function onto plane waves or using the time-dependent surface flux (tSURFF) method for PES extraction. A thorough analysis is performed to assess the reliability of these methods, and the time integral in the tSURFF ionization amplitude is divided into smaller time intervals to relate them to specific parts of the PES.
Article
Physics, Multidisciplinary
Zhiqiang Wang, Wei Quan, Xiaolei Hao, Jing Chen, Xiaojun Liu
Summary: In this study, we investigate the effect of the ellipticity on the excitation and ionization of noble gas atoms in strong laser fields. We use a semiclassical model to analyze the results at different intensities and wavelengths, considering or ignoring the nonadiabatic effect. Our findings reveal that the ratio between excitation and ionization yields shows an anomalous maximum at nonzero ellipticity when nonadiabatic effect is ignored, but this anomalous behavior disappears when nonadiabatic effect is considered. This can be attributed to the nonadiabatic corrections of instantaneous ionization rate and the initial photoelectron momentum distribution at the tunnel exit.
FRONTIERS IN PHYSICS
(2023)
Article
Optics
Michael Klaiber, Karen Z. Hatsagortsyan, Christoph H. Keitel
Summary: The electron nondipole dynamics in tunneling ionization in an elliptically polarized laser field is studied using a relativistic Coulomb-corrected strong-field approximation. Attoclock angle-resolved light-front momentum distributions are calculated at different ellipticities of the laser field and analyzed with an improved simple model. The correlations between longitudinal and transverse momentum components are examined.
Article
Multidisciplinary Sciences
Seunghwoi Han, Lisa Ortmann, Hyunwoong Kim, Yong Woo Kim, Takashi Oka, Alexis Chacon, Brent Doran, Marcelo Ciappina, Maciej Lewenstein, Seung-Woo Kim, Seungchul Kim, Alexandra S. Landsman
NATURE COMMUNICATIONS
(2019)
Article
Physics, Multidisciplinary
Shubhadeep Biswas, Benjamin Foerg, Lisa Ortmann, Johannes Schoetz, Wolfgang Schweinberger, Tomas Zimmermann, Liangwen Pi, Denitsa Baykusheva, Hafiz A. Masood, Ioannis Liontos, Amgad M. Kamal, Nora G. Kling, Abdullah F. Alharbi, Meshaal Alharbi, Abdallah M. Azzeer, Gregor Hartmann, Hans J. Woerner, Alexandra S. Landsman, Matthias F. Kling
Article
Chemistry, Multidisciplinary
Mohammadreza Eidi, Mohsen Vafaee, Hamed Koochaki Kelardeh, Alexandra Landsman
Summary: In this study, the time-dependent Schrodinger equation is solved using coherent states as basis sets to investigate high harmonic generation in a one-dimensional realistic system. The static coherent states (SCS) method is applied to study HHG in the hydrogen molecular ion induced by a linearly polarized laser field. The results suggest that the SCS method can be effectively used for full-dimensional quantum simulation of higher dimensional systems.
JOURNAL OF COMPUTATIONAL CHEMISTRY
(2021)
Article
Chemistry, Physical
Tomas Zimmermann, Filip Sebesta, Jaroslav Burda
Summary: This article highlights the importance of performing additional Legendre transformations in a constant pH environment for a correct thermodynamic description of reactions. The power of the new thermodynamic potential (ΔGA(0)) is demonstrated through three examples, showing its grand canonical character and pH dependency. The combination of this approach with QM/MM MD simulations also reveals interesting changes in energy values based on pH shifts.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Physics, Multidisciplinary
Xu-Zhen Gao, Alexandra S. Landsman, Hushan Wang, Pei Huang, Yanpeng Zhang, Bo Wang, Yishan Wang, Huabao Cao, Yuxi Fu, Liang-Wen Pi
Summary: This study looks into strong field ionization of atomic gas in a plasmonically enhanced field generated by illuminating nanometer-sized structures with ultrafast laser pulses. Analytical estimates are derived using perturbation theory and corroborated by simulations, providing insights into electron energy spectrum dependence on near-field properties and suggesting electric field sensor applications. The research also presents the potential use of nanotips as sources of tunable ultrashort electron beams based on laser parameters and near-field decay length.
NEW JOURNAL OF PHYSICS
(2021)
Article
Physics, Multidisciplinary
L. Ortmann, A. AlShafey, A. Staudte, A. S. Landsman
Summary: This study introduces a method to quantify the relative contributions of two processes under intense light exposure. Experimental results show that electrons are primarily ionized from the downfield atom when subjecting N2 to strong field ionization. This suggests that the bound state wave function mainly evolves adiabatically in the laser field, although ionization enhancement process still plays a role.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Physical
Edward Ditler, Tomas Zimmermann, Chandan Kumar, Sandra Luber
Summary: This paper presents the implementation of nuclear velocity perturbation theory and verifies it using different methods, providing a basis and reference for future research.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2022)
Article
Multidisciplinary Sciences
Sha Li, Yaguo Tang, Lisa Ortmann, Bradford K. Talbert, Cosmin I. Blaga, Yu Hang Lai, Zhou Wang, Yang Cheng, Fengyuan Yang, Alexandra S. Landsman, Pierre Agostini, Louis F. DiMauro
Summary: Studies have been mostly theoretical on laser-driven strong field processes under a (quasi-)static field, but this study provides experimental evidence by using a bichromatic approach for high harmonic generation (HHG) in a dielectric. The authors investigate the physics behind the THz field induced static symmetry breaking and its effects on even-/odd-order harmonics, and demonstrate the modulation of harmonic distribution as a way to probe HHG dynamics. They also report a delay-dependent frequency shift in even-order harmonics, suggesting limitations in the static symmetry breaking interpretation and opening opportunities in precise attosecond pulse shaping.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Atomic, Molecular & Chemical
Alex Schimmoller, Harrison Pasquinilli, Alexandra S. Landsman
Summary: A recent study demonstrates the extraction of the ionization site of a neutral diatomic molecule by comparing QTMC simulations with experimental measurements. The study shows that a downfield atom is approximately twice as likely to be ionized as an upfield atom in a neutral nitrogen molecule using a 40-femtosecond infrared pulse. However, it remains uncertain whether the assumption of a zero CEP is valid for short, few-cycle pulses.
Article
Physics, Atomic, Molecular & Chemical
Brock Grafstrom, Alexandra S. Landsman
Summary: The analysis and measurement of Wigner time delays provide detailed information about the electronic environment within atomic and molecular systems. This study focuses on calculating the average Wigner delay using relativistic random-phase approximation for various atomic pairings. The results show qualitative similarities between isoelectronic pairings and a decrease in Wigner delay shift with increasing atomic mass.
Article
Optics
Xu-Zhen Gao, Alexandra S. Landsman, Huabao Cao, Yanpeng Zhang, Yishan Wang, Yuxi Fu, Liang-Wen Pi
Summary: In this study, an analytical expression for the return energy of an electron in a monochromatic laser field is derived. The kinetic energy is expanded to second order and the additional kinetic energy is found to be attributable to both zero-order and second-order velocities. The nonzero velocity of the initial tunneling step is shown to have a quantifiable effect on the cutoff energy measured in high harmonic generation.
Article
Materials Science, Multidisciplinary
Dasol Kim, Dongbin Shin, Alexandra S. Landsman, Dong Eon Kim, Alexis Chacon
Summary: High-order harmonic generation is a widely studied phenomenon in atomic gas and has recently been applied to solids to study nonlinear electronic response and generate high-frequency radiation. Researchers have explored using this method to investigate topological materials and have addressed some theoretical challenges.
Article
Optics
L. Ortmann, C. Hofmann, I. A. Ivanov, A. S. Landsman
Summary: The study reveals that the duration of the laser pulse significantly affects the quantum number distribution of Rydberg states, thereby impacting the EUV yield for coherent high-frequency radiation. Analysis of electron trajectories identifies elastic recollision as the underlying cause of this change.
Correction
Optics
L. Ortmann, C. Hofmann, A. S. Landsman