1. 14 Jan 2023 Preprint arXiv

    Block Belief Propagation Algorithm for 2D Tensor Networks

    Chu Guo, Dario Poletti, Itai Arad
    Abstract

    Belief propagation is a well-studied algorithm for approximating local marginals of multivariate probability distribution over complex networks, while tensor network states are powerful tools for quantum and classical many-body 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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  2. 13 Jan 2023 Preprint arXiv

    Roadmap on structured waves

    Konstantin Y Bliokh, Ebrahim Karimi, Miles J Padgett, Miguel A Alonso, M R Dennis, A Dudley, A Forbes, S Zahedpour, S W Hancock, H M Milchberg, S Rotter, Franco Nori, Ş K Özdemir, N Bender, H Cao, P B Corkum, C Hernández-García, H Ren, Yuri S Kivshar, M G Silveirinha, Nader Engheta, A Rauschenbeutel, P Schneeweiss, J Volz, D Leykam, D A Smirnova, K Rong, B Wang, Erez Hasman, M F Picardi, ... show all 50 authors
    Abstract

    Structured 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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  3. 11 Jan 2023 Preprint arXiv

    Magneto optics of a doubly charged quantum dot -- Observation of a negative diamagnetic shift

    Giora Peniakov, A Beck, Eilon Poem, Zu-En Su, Boaz Taitler, David Gershoni
    Abstract

    We present magneto-optical studies of a self-assembled 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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  4. 6 Jan 2023 Journal Article Physical Review X

    Observation of 2D Cherenkov Radiation

    Abstract

    For over 80 years of research, the conventional description of free-electron radiation phenomena, such as Cherenkov radiation, has remained unchanged: classical three-dimensional electromagnetic waves. Interestingly, in reduced dimensionality, the properties of free-electron radiation are predicted to fundamentally change. Here, we present the first observation of

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  5. 4 Jan 2023 Preprint arXiv

    Free-electron superfluorescence: collective optical dynamics at deep-subwavelength resolution

    Abstract

    Long-range 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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  6. 4 Jan 2023 Journal Article Nature

    Photonic flatband resonances for free-electron radiation

    Yujia Yang, Charles Roques-Carmes, Steven E Kooi, Haoning Tang, Justin Beroz, Eric Mazur, Ido Kaminer, John D Joannopoulos, Marin Soljacic
    Abstract

    Flatbands have become a cornerstone of contemporary condensed-matter 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 magic-angle systems. In photonics, they enable properties including slow light1 and lasing2

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  7. 4 Jan 2023 Journal Article Science Advances

    Compton scattering driven by intense quantum light

    Abstract

    Compton scattering is a cornerstone of quantum physics, describing the fundamental electron-photon interaction. Inverse Compton scattering can create attosecond x-ray pulses by high-intensity 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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  8. 3 Jan 2023 Journal Article Chemical Society Reviews

    Atomically flat semiconductor nanoplatelets for light-emitting applications

    Bing Bai, Chengxi Zhang, Yongjiang Dou, Lingmei Kong, Lin-Wang Wang, Sheng Wang, Jun Li, Yi Zhou, Long Liu, Baiquan Liu, Xiaoyu Zhang, Ido Hadar, Yehonadav Bekenstein, Aixiang Wang, Zongyou Yin, Lyudmila Turyanska, Jochen Feldmann, Xuyong Yang, Guohua Jia
    Abstract

    The last decade has witnessed extensive breakthroughs and significant progress in atomically flat two-dimensional (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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  9. 3 Jan 2023 Journal Article Quantum

    The Synthetic Hilbert Space of Laser-Driven Free-Electrons

    Guy Braiman, Ori Reinhardt, Chen Mechel, Omer Levi, Ido Kaminer
    Abstract

    Recent 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 laser-driven free electrons as a "synthetic Hilbert space" in

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  10. 23 Dec 2022 Journal Article Physical Review A

    Degenerate Raman sideband cooling of K40 atoms

    Elad Zohar, Yanay Florshaim, Oded Zilberman, Amir Stern, Yoav Sagi
    Abstract

    We report on the implementation of degenerate Raman sideband cooling of K 40 atoms. The scheme incorporates a three-dimensional (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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