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Article
Multidisciplinary Sciences
David Nabben et al.
Summary: The electrodynamic response of electrons to the optical cycles of light is crucial for understanding and controlling the electromagnetic responses of materials. In this study, transmission electron microscopy is advanced to attosecond time resolution, allowing for the observation of optical responses within one cycle of excitation light. The results demonstrate the importance of combining electron microscopy and attosecond laser science to understand light-matter interactions.
Article
Physics, Multidisciplinary
Rudolf Haindl et al.
Summary: By using femtosecond photoemission in a transmission electron microscope, we have generated Coulomb-correlated pair, triple, and quadruple states of free electrons. The spatial and spectral characterization of the electron ensemble emitted by each laser pulse reveals distinctive energy and momentum correlations arising from strong few-body Coulomb interactions. These electron number states have pronounced spatial and spectral characteristics that allow for filtering schemes to control the statistical distribution of the pulse charge, facilitating the preparation of highly non-Poissonian electron beams for microscopy and lithography applications.
Article
Physics, Multidisciplinary
Stefan Meier et al.
Summary: Even a small number of electrons can have strong interactions when confined in a small space-time dimension, leading to electron-electron correlations that can reduce noise. By analyzing laser-emitted electrons and applying energy filtering, researchers demonstrated strong anticorrelations and reduced shot noise in pulsed electron beams. This study also provided insights into how strong laser fields influence electron correlations.
Article
Multidisciplinary Sciences
Armin Feist et al.
Summary: In this work, we show the preparation of electron-photon pair states by exploiting the phase-matched interaction between free electrons and the optical microresonator on a photonics chip. This breakthrough provides a foundation for the future development of free-electron quantum optics.
Article
Nanoscience & Nanotechnology
Stefan Meier et al.
Summary: The transverse coherence of electrons is crucial in various applications such as electron microscopy. Pulsed versions of electron microscopy have been developed using femtosecond laser-triggering electron emission. In this study, we observed electron interference fringes and measured how the interference visibility decreases with increasing electron bunch charge. We explained the loss of coherence based on model simulations and linked the visibility reduction to an increase in the effective source size through the van Cittert-Zernike theorem.
Article
Microscopy
Yves Auad et al.
Summary: The study developed an event-based hyperspectral EELS technique using a specific integrated circuit detector and embedded time-to-digital lines, allowing for hyperspectral image acquisition without additional costs, as well as enabling the study of chemical reactions in samples under electron beam irradiation.
Article
Multidisciplinary Sciences
Nadezda Varkentina et al.
Summary: Tracking the lifespan of optical excitations is crucial in understanding the photophysics of materials. In this study, electron spectroscopies were used to explore the creation and decay of excitations in two representative optical materials. The developed cathodoluminescence excitation spectroscopy method allows for imaging energy transfer pathways at the nanometer scale.
Article
Physics, Multidisciplinary
M. Tsarev et al.
Summary: The study introduces a time-domain interferometer that measures and differentiates pure and ensemble coherences in an electron beam, revealing substantial pure electron coherence related to the thermodynamics of the emitter material and lower ensemble coherence affected by space-charge effects. The results show pure temporal coherences above 5 fs in a high-brightness beam with over 10^9 electrons per second.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Sam Keramati et al.
Summary: By using coincidence measurements of femtosecond pulsed electron pairs, sub-Poissonian electron statistics have been observed, which are nonrandom due to two-electron Coulomb interactions and exhibit an antibunching signal of 1 part in 4. This advancement represents a fundamental step towards observing a strongly quantum degenerate electron beam necessary for various applications, particularly electron correlation spectroscopy.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Makoto Kuwahara et al.
Summary: This study investigates intensity interference between pairs of electrons using a spin-polarized electron beam, demonstrating spin-dependent antibunching and its association with fermionic statistics. The experimental results show that time correlation is only affected by spin polarization, highlighting the role of coherent spin-polarized electron beams in extracting intrinsic quantum interference.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Raphael Dahan et al.
Summary: This research demonstrates the transition of photon statistics effects in free-electron-light interactions and the potential for ultrafast quantum tomography of light using free electrons as probes. The electron walker can perform both quantum weak measurements and projective measurements, leading to previously inaccessible concepts in quantum optics.
Article
Physics, Multidisciplinary
M. Tsarev et al.
Summary: This research successfully modulates a free-electron beam into high-contrast electron pulses and free-electron qubits using laser light and a transmission electron microscope. The method has promising applications in ultrafast material characterizations or investigations of free-electron quantum mechanics.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Microscopy
J. Paul van Schayck et al.
Article
Physics, Applied
Daen Jannis et al.
APPLIED PHYSICS LETTERS
(2019)
Article
Instruments & Instrumentation
A. R. Faruqi et al.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2018)
Article
Instruments & Instrumentation
Mohamad Khalil et al.
JOURNAL OF SYNCHROTRON RADIATION
(2018)
Article
Microscopy
Armin Feist et al.
Article
Chemistry, Physical
Young Min Lee et al.
STRUCTURAL DYNAMICS-US
(2017)
Review
Multidisciplinary Sciences
Rafael Fernandez-Leiro et al.
Article
Optics
F. O. Kirchner et al.
Article
Biochemical Research Methods
Xueming Li et al.
Article
Multidisciplinary Sciences
M. Aidelsburger et al.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2010)
Review
Multidisciplinary Sciences
Ahmed H. Zewail
