Erik Lötstedt

Bio: Erik Lötstedt is an academic researcher from University of Tokyo. The author has contributed to research in topics: Ionization & Laser. The author has an hindex of 20, co-authored 76 publications receiving 1067 citations. Previous affiliations of Erik Lötstedt include Max Planck Society & Missouri University of Science and Technology.

Sub-10-fs population inversion in N 2 + in air lasing through multiple state coupling

Abstract: Remote generation of population-inverted gain media in air is a step towards the realization of bright and coherent atmospheric lasers. Here, the authors verify population inversion in N2+ and demonstrate the generation of air lasing by acting on it as the gain medium.

Barrier control in tunneling e+-e- photoproduction.

Abstract: Tunneling electron-positron pair production is studied in a new setup in which a strong low-frequency and a weak high-frequency laser field propagate in the same direction and collide head-on with a relativistic nucleus. The electron-positron pair-production rate is calculated analytically in the limit in which in the nucleus rest frame, the strong field is undercritical and the frequency of the weak field is below and close to the pair-production threshold. By changing the frequency of the weak field, one can reduce the tunneling barrier substantially. As a result, tunneling pair production is shown to be observable with presently available technology.

Significant Enhancement of N 2 + Lasing by Polarization-Modulated Ultrashort Laser Pulses

Abstract: We show that the intensity of self-seeded ${\mathrm{N}}_{2}^{+}$ lasing at 391 nm, assigned to the ${B}^{2}{\mathrm{\ensuremath{\Sigma}}}_{u}^{+}({v}^{\ensuremath{'}}=0)\ensuremath{\rightarrow}{X}^{2}{\mathrm{\ensuremath{\Sigma}}}_{g}^{+}({v}^{\ensuremath{'}\ensuremath{'}}=0)$ emission, is enhanced by 2 orders of magnitude by modulating in time the polarization of an intense ultrashort near-IR (40 fs, 800 nm) laser pulse with which ${\mathrm{N}}_{2}$ is irradiated. We find that this dramatic enhancement of the 391 nm lasing is sensitive to the temporal variation of the polarization state within the laser pulse while the intensity of the spontaneous fluorescence emission at 391 nm is kept constant when the polarization state varies. We conclude that a postionization multiple-state coupling, through which the population can be transferred from the ${X}^{2}{\mathrm{\ensuremath{\Sigma}}}_{g}^{+}$ state of ${\mathrm{N}}_{2}^{+}$ to the first electronically excited ${A}^{2}{\mathrm{\ensuremath{\Pi}}}_{u}$ state, leads to the depletion of the population in the ${X}^{2}{\mathrm{\ensuremath{\Sigma}}}_{g}^{+}$ state, and consequently, to the population inversion between the ${X}^{2}{\mathrm{\ensuremath{\Sigma}}}_{g}^{+}$ state and the ${B}^{2}{\mathrm{\ensuremath{\Sigma}}}_{u}^{+}$ state.

Nonperturbative treatment of double compton backscattering in intense laser fields.

Abstract: The emission of a pair of entangled photons by an electron in an intense laser field can be described by two-photon transitions of laser-dressed, relativistic Dirac-Volkov states. In the limit of a small laser field intensity, the two-photon transition amplitude approaches the result predicted by double Compton scattering theory. Multiexchange processes with the laser field, including a large number of exchanged laser photons, cannot be described without the fully relativistic Dirac-Volkov propagator. The nonperturbative treatment significantly alters theoretical predictions for future experiments of this kind. We quantify the degree of polarization correlation of the photons in the final state by employing the well-established concurrence as a measure of the entanglement.

Evaluation of laser-assisted bremsstrahlung with Dirac-Volkov propagators.

Abstract: We study spontaneous bremsstrahlung emission in a highly intense laser field. In this regime the interaction with the laser field has to be treated nonperturbatively by using the relativistic formalism including Dirac-Volkov propagators, while the interaction with the Coulomb field and the bremsstrahlung radiation can be treated in first-order perturbation theory. For the intermediate electron state a fully laser-dressed propagator is used, including radiative corrections to avoid singularities on the mass shell. We find that the use of the Dirac-Volkov propagator is crucial to obtain correct numerical results. The cross section of the process is evaluated for laser intensities of order ${10}^{20}\text{ }\text{ }\mathrm{W}/{\mathrm{cm}}^{2}$ and relativistic energies of the initial electron.

Extremely high-intensity laser interactions with fundamental quantum systems

Abstract: The field of laser-matter interaction traditionally deals with the response of atoms, molecules, and plasmas to an external light wave. However, the recent sustained technological progress is opening up the possibility of employing intense laser radiation to trigger or substantially influence physical processes beyond atomic-physics energy scales. Available optical laser intensities exceeding ${10}^{22}\text{ }\text{ }\mathrm{W}/{\mathrm{cm}}^{2}$ can push the fundamental light-electron interaction to the extreme limit where radiation-reaction effects dominate the electron dynamics, can shed light on the structure of the quantum vacuum, and can trigger the creation of particles such as electrons, muons, and pions and their corresponding antiparticles. Also, novel sources of intense coherent high-energy photons and laser-based particle colliders can pave the way to nuclear quantum optics and may even allow for the potential discovery of new particles beyond the standard model. These are the main topics of this article, which is devoted to a review of recent investigations on high-energy processes within the realm of relativistic quantum dynamics, quantum electrodynamics, and nuclear and particle physics, occurring in extremely intense laser fields.

Journal of Physics B: atomic, molecular and optical physics

Abstract: Journal of Applied Spectroscopy | HomeNuclear Instruments and Methods in Physics Research Atomic Physics authors/titles recent submissionsHome IOP PublishingPhysics Reports Journal ElsevierJournal WikipediaApplied Physics B | HomeThe European Physical Journal D (EPJ D)Chinese Physics B IOPscienceUkrainian Journal of PhysicsJournal of the Optical Society of America B JOSA BInternational Journal of Modern Physics B World ScientificJournal rankings for ARC, all 01* categories sorted Physics WikipediaInternational Scholarly Research Notices | HindawiAbbreviations A B Bioscience Journal Abbreviations Physical Review BEPJ European Physical JournalJournal of Vacuum Science & Technology BScitation HomeInternational Journal of Modern Physics E World ScientificJournal of Physics B: Atomic, Molecular and Optical The European Physical Journal B (EPJ B)Physical Review AAuthors Scientific Papers GS JournalJournal of Physics: Conference Series Latest Impact Factor Canadian Journal of Physics Canadian Science PublishingNuclear Physics B | Journal | ScienceDirect.com by Elsevier International Journal of Modern Physics E. Nuclear Physics. ISSN (print): 0218-3013 | ISSN (online Polarizability effects in atomic nuclei J. N. Orce Vol to provide the scientific background for future joint projects between the experts from these diverse areas in hadron physics. (Read full article.) Neutron star equations of state and GS Journal is your leading platform for high quality science journals, scientific papers and peer-reviewed full-text journals />07-12-2021 � The European Physical Journal D (EPJ D) presents new and original research results in Atomic, Molecular, Optical and Plasma Physics29-11-2021 � Editors' Choice Canadian Journal of Physics Cross sections and ionization rates are atomic data that have important applications in astrophysics and plasma physics. This work aims to calculate the electron impact ionization cross sections of some helium-like ions using the relativistic distorted wave method implemented in Flexible Atomic Code.Nuclear Physics B focuses on the domain of high energy physics, quantum field theory, statistical systems, and mathematical physics, and includes four main sections: high energy physics phenomenology, high energy physics theory, high energy physics experiment, and quantum field theory, ⋯. Read more18-08-2021 � Title abbreviations for journals in the areas of biology and chemistry. Bioscience journal title abbreviations A B.The American Physical Society (APS) is delighted to announce the appointment of David Scanlon, Professor of Computational Materials Design, University College of London, United Kingdom, to the role of Lead Editor of PRX Energy, APS’s new, highly selective, open access journal covering energy science and technology.Professor Scanlon will serve as the inaugural Lead Editor of ⋯15-12-2021 � Journal Impact IF Ranking � In the Physics and Astronomy (all) research field, the Quartile of Journal of Physics: Conference Series is Q4. Journal of Physics: Conference Series has been ranked #191 over 233 related journals in the Physics and Astronomy (all) research category. The ranking percentile of Journal of Physics: Conference Series is ⋯30-11-2021 � 14-b Metrolohichna str., Kyiv, Ukraine, 03028 Tel: +380(44) 521-31-88 E-mail: ujp@bitp.kiev.ua Scope: Ukrainian Journal of Physics is the general physics edition of the Department of Physics and Astronomy of the National Academy of Sciences of Ukraine.Journal Rankings proposed by the Austral. Math. Society, FoR codes 01*15-10-2021 � Journal of Vacuum Science and Technology B is an interdisciplinary journal focused on nanotechnology and microelectronic devices and processing, devoted to publishing reports of original research, letters, and review articles.Journal of Applied Physics Aug 23 2016. Shaping the Understanding the nature of the forces that both control and result from the molecular and atomic arrangements in matter will help shed light on chemical interactions in nature and can therefore lead to cures for disease.Physics is the natural science that studies matter, its fundamental constituents, its motion and behavior through space and time, and the related entities of energy and force. Physics is one of the most fundamental scientific disciplines, and its main goal is to understand how the universe behaves.. Physics is one of the oldest academic disciplines and, through its inclusion of ⋯Chinese Physics B is an international journal covering the latest developments and achievements in all branches of physics (with the exception of nuclear physics and physics of elementary particles and fields, which is covered by Chinese Physics C).Topic Scope: JOSA B emphasizes scientific research on the fundamentals of the interaction of light with matter such as quantum optics, nonlinear optics, and laser physics. Topics include atom optics and cold atoms, integrated and fiber optics, metamaterials, nanophotonics, photonic crystals, photorefractive optics and holography, physics of optical materials, spectroscopy, ⋯Journal of Physics B: Atomic, Molecular and Optical Physics covers the study of atoms, ions, molecules and clusters, and their structure and interactions with particles, photons or fields. Submit an article opens in new tab Track my article opens in new tab. RSS. Sign up for Phys. Rev. B 104, 174443 (2021) Quantized phase-coherent heat transport of counterpropagating Majorana modes Alexander G. Bauer et al. Phys. Rev. B 104, L201410 (2021) Soft-mode anisotropy in the negative thermal expansion material ReO 3 Tobias A. Bird et al. Phys. Rev. B 104, 214102 (2021) Critical drag as a mechanism for resistivityInternational Journal of Modern Physics B Condensed Matter Physics; Statistical Physics; Atomic, Molecular and Optical Physics ISSN (print): 0217-9792 | ISSN (online): 1793-6578We publish academic journals, as well as books and conference proceedings. All our academic publications are hosted on IOPscience, a platform specifically designed to help readers access scientific, technical and medical content quickly and easily.. We also provide expert science journalism through Physics World, a trusted source of science news.04-11-2021 � Journal of Applied Spectroscopy reports on key applications of spectroscopy in, physics, chemistry , material science, medicine, biology, ecology and spectral instrument-industry . An increasing number of papers presented here focus on the theory of lasers, as well as on the tremendous potential for the practical applications of lasers in numerous fields and industries.A journal, from the Old French journal (meaning "daily"), may refer to: . Bullet journal, a method of personal organizations; Diary, a record of what happened over the course of a day or other period; Daybook, also known as a general journal, a daily record of financial transactions; Logbook, a record of events important to the operation of a vehicle, facility, or otherwise29-11-2021 � EPJ B Topical Issue: Recent developments in the functional renormalization group approach to correlated electron systems ; EPJ D Topical Issue: Advances in Multi-Scale Modelling of Intense Electronic Excitation Processes ; EPJ D Topical Issue: Atomic, Molecular and Optical Techniques for Fundamental PhysicsInternational Journal of Differential Equations. Journal metrics. Acceptance rate 25%. Submission to final decision 46 days. Acceptance to publication 47 days. CiteScore 1.900. Journal Citation Indicator 0.520. Impact Factor-APC $1025. International Journal of Microbiology. Journal metrics.14-12-2021 � Publishing essential research results in two of the most important areas of applied physics, both Applied Physics sections figure among the top most cited journals in this field. In addition to regular papers Applied Physics B: Lasers and Optics features invited reviews. Fields of topical interest are covered by feature issues.02-05-2017 � Physics Reports keeps the active physicist up-to-date on developments in a wide range of topics by publishing timely reviews which are more extensive than just literature surveys but normally less than a full monograph. Each report deals with one specific subject and is generally published in a separate volume. These reviews are specialist in nature but contain ⋯NIMB or Section B of Nuclear Instruments and Methods in Physics Research covers all aspects of the interaction of energetic beams with atoms, molecules and aggregate forms of matter. This includes ion beam analysis and ion beam modification of materials as well as basic data of importance for ⋯ Read more13-11-2021 � The European Physical Journal B Statistical and Nonlinear Physics First-passage time and change of entropy. V. V. Ryazanov. Eur. Phys. J. B, 94 12 (2021) 242. Published online: 11 December 2021. DOI: 10.1140/epjb/s10051 12th International Conference on Atomic and Molecular Data and Their Applications 25-29 September 2022 12-08-2021 � Subjects: Atomic Physics (physics.atom-ph); Chemical Physics (physics.chem-ph); Quantum Physics (quant-ph) [8] arXiv:2108.05996 [ pdf , other ] Title: Ultracold $^{88}\rm{Sr}_2$ molecules in the absolute ground state Copyright code : f0a76c2d68cb7e7cb469c606fb9f8c72

Rotational Spectroscopy of Diatomic Molecules

Abstract: 1. General introduction 2. The separation of nuclear and electronic motion 3. The electronic hamiltonian 4. Interactions arising from nuclear magnetic and electric moments 5. Angular momentum theory and spherical tensor algebra 6. Electronic and vibrational states 7. Derivation of the effective hamiltonian 8. Molecular beam magnetic and electric resonance 9. Microwave and far-infrared magnetic resonance 10. Pure rotational spectroscopy 11. Double resonance spectroscopy Appendices.

On the characterization of entanglement

Abstract: In the context of quantifying entanglement we study those functions of a multipartite state which do not increase under the set of local transformations. A mathematical characterization of these monotone magnitudes is presented. They are then related to optimal strategies of conversion of shared states. More detailed results are presented for pure states of bipartite systems. It is show that more than one measure are required simultaneously in order to quantify completely the non-local resources contained in a bipartite pure state, while examining how this fact does not hold in the so-called asymptotic limit. Finally, monotonicity under local transformations is proposed as the only natural requirement for measures of entanglement.