
14 Jan 2023 • Preprint • arXiv
Block Belief Propagation Algorithm for 2D Tensor Networks
AbstractBelief propagation is a wellstudied algorithm for approximating local marginals of multivariate probability distribution over complex networks, while tensor network states are powerful tools for quantum and classical manybody problems. Building on a recent connection between the belief propagation algorithm and the problem of tensor network contraction, we propose a
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13 Jan 2023 • Preprint • arXiv
Roadmap on structured waves
AbstractStructured waves are ubiquitous for all areas of wave physics, both classical and quantum, where the wavefields are inhomogeneous and cannot be approximated by a single plane wave. Even the interference of two plane waves, or a single inhomogeneous (evanescent) wave, provides a number of nontrivial phenomena and additional functionalities as compared to a single plane
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11 Jan 2023 • Preprint • arXiv
Magneto optics of a doubly charged quantum dot  Observation of a negative diamagnetic shift
AbstractWe present magnetooptical studies of a selfassembled semiconductor quantum dot, concentrating specifically on the case in which the dot is doubly positively charged, studying this way the confined hole  hole exchange interaction. A simple harmonic potential model, which we extend to capture the influence of an externally applied magnetic field in Faraday configuration
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6 Jan 2023 • Journal Article • Physical Review X
Observation of 2D Cherenkov Radiation
AbstractFor over 80 years of research, the conventional description of freeelectron radiation phenomena, such as Cherenkov radiation, has remained unchanged: classical threedimensional electromagnetic waves. Interestingly, in reduced dimensionality, the properties of freeelectron radiation are predicted to fundamentally change. Here, we present the first observation of
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4 Jan 2023 • Preprint • arXiv
Freeelectron superfluorescence: collective optical dynamics at deepsubwavelength resolution
AbstractLongrange coherence and correlations between electrons in solids are the cornerstones for developing future quantum materials and devices. In 1954, Dicke described correlated spontaneous emission from closely packed quantum emitters, forming the theoretical basis of superradiance and superfluorescence. Since then, it has remained an open challenge to observe such
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4 Jan 2023 • Journal Article • Nature
Photonic flatband resonances for freeelectron radiation
AbstractFlatbands have become a cornerstone of contemporary condensedmatter physics and photonics. In electronics, flatbands entail comparable energy bandwidth and Coulomb interaction, leading to correlated phenomena such as the fractional quantum Hall effect and recently those in magicangle systems. In photonics, they enable properties including slow light^{1} and lasing^{2}
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4 Jan 2023 • Journal Article • Science Advances
Compton scattering driven by intense quantum light
AbstractCompton scattering is a cornerstone of quantum physics, describing the fundamental electronphoton interaction. Inverse Compton scattering can create attosecond xray pulses by highintensity lasers driving free electrons. So far, in all theory and experiments, the observables of Compton scattering and its generalizations could be described by treating the driving
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3 Jan 2023 • Journal Article • Chemical Society Reviews
Atomically flat semiconductor nanoplatelets for lightemitting applications
AbstractThe last decade has witnessed extensive breakthroughs and significant progress in atomically flat twodimensional (2D) semiconductor nanoplatelets (NPLs) in terms of synthesis, growth mechanisms, optical and electronic properties and practical applications. Such NPLs have electronic structures similar to those of quantum wells in which excitons are predominantly confined
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3 Jan 2023 • Journal Article • Quantum
The Synthetic Hilbert Space of LaserDriven FreeElectrons
AbstractRecent advances in laser interactions with coherent free electrons have enabled to shape the electron's quantum state. Each electron becomes a superposition of energy levels on an infinite quantized ladder, shown to contain up to thousands of energy levels. We propose to utilize the quantum nature of such laserdriven free electrons as a "synthetic Hilbert space" in
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23 Dec 2022 • Journal Article • Physical Review A
Degenerate Raman sideband cooling of ${}^{40}\mathrm{K}$ atoms
AbstractWe report on the implementation of degenerate Raman sideband cooling of ${}^{40}K$ atoms. The scheme incorporates a threedimensional (3D) optical lattice, which confines the atoms and drives the Raman transitions. The optical cooling cycle is closed by two optical pumping beams. The wavelength of the laser beams forming the
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