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  • Quantum transport response of topological hinge modes

    Experimentalists from Princeton University, in collaboration with Titus Neupert, have found evidence for quantum coherent transport along the crystal hinges of a topological quantum material. The material in question is bismuth bromide, a so-called higher-order topological insulator. The theory group of Titus Neupert had predicted the existence of such materials in 2017, with various proposed material systems probed with different experimental techniques over the past years. The common feature of such higher-order topological insulators are conducting channels on the crystal hinges which are carrying current free of dissipation. As such, they could be used in future electronics.

    The present experiment, for the first time, demonstrates quantum coherent transport through such hinge modes, by demonstrating so-called Aharonov-Bohm oscillations of the conductivity in a magnetic field. While the experiment does not prove the dissipationless nature of current flow, it demonstrates that the current is clearly concentrated at the crystal hinges.

    Reference:
    Quantum transport response of topological hinge modes
    S. Hossain et al., Nature Physics (2024)

    https://www.nature.com/articles/s41567-024-02388-1

  • SHiP experiment approved

    Just over ten years after its initial proposal, the SHiP experiment has been approved by the CERN management to start data taking in the next decade! The SHiP experiment is designed to search for extremely weakly interacting particles by using an incredibly intense beam of protons available at the LHC.

    The experiment was co-founded by Prof. Nicola Serra and was supported by an SNF-Starting grant in the design phase, where Martina Ferrillo (left) and Dr. Iaroslava Bezshyiko (right) made vital contributions. The approval of the CERN management moves the experiment into the finalization of the design and construction phase – what an exciting time to be part of the experiment!

    More

  • Lidia del Rio

    Welcome Dr. Lídia del Rio

    As of March 1, 2024, Lidia del Rio joins the Department of Physics as an independent PI, the Essentia Foundation Research Fellow for Quantum Information Theory, funded by the Stichting Essentia Foundation. Dr. del Rio’s research interests are on quantum information theory and foundations of physics. Furthermore she will be invested in outreach and science communication projects at UZH and beyond.

  • Welcome Dr. Chiara Capelli

    As of March 1, 2024, Dr. Chiara Capelli joins the Department of Physics as an Ambizione Fellow in the group of Laura Baudis. She will work on optical measurements and weak decays searches with liquid xenon detectors.

  • Weak signals can be extracted by neural network denoising

    A recent publication in Nature Machine Learning by the groups Neupert, Natterer and Chang shows how weak signals can be extracted by neural network denoising

  • Green light for LISA

    The LISA (Laser Interferometer Space Antenna) mission to investigate gravitational waves in space has successfully completed the preliminary studies and testing phase. This ESA project has thus  reached a major milestone: it has passed the stage of intensive testing by experts in the Mission Adoption Review process.

  • 2023 Buchalter Cosmology Prize for Davide Racco

    The work “Footprints of the QCD Crossover on Cosmological Gravitational Waves at Pulsar Timing Arrays”, by Dr. Davide Racco and his collaborators Dr. Gabriele Franciolini and Fabrizio Rompineve, has been awarded with the third prize of the Buchalter Cosmology Prize.

     

  • Welcome Prof. Marcelle Soares-Santos

    Prof. Marcelle Soares-Santos will work  in observational cosmology with cosmic surveys and gravitational waves

  • Welcome Prof. Bjoern Penning

    Prof.  Bjoern Penning will work on Dark Matter searches with the LZ experiment

  • Vacuum cleaving of superconducting niobium tips

    The first 1st-author publication of Carolina Marques (group Natterer) describes vacuum cleaving of superconducting niobium tips to optimize noise filtering and with adjustable gap size for scanning tunneling microscopy.

    https://doi.org/10.1016/j.mex.2023.102483

  • Group Bzdušek: Spectra of hyperbolic lattices from supercells

    In their latest PRL work, the Bzdušek group formulates a novel method for efficient modelling of hyperbolic lattices. Simultaneously, two associated software packages have been publicly released to make the technique accessible to the broader community.

  • Wtt production

    Group Grazzini: Wtt production paper

    Congratulations: The paper on Wtt production has been published on PRL as Editors’ suggestion!

    The production of a top-antitop quark pair in association with a W boson (t¯tW) is one of the heaviest signatures currently probed at the Large Hadron Collider. Since the first observation reported in 2015, the corresponding rates have been found to be consistently higher than the standard model predictions, which are based on next-to-leading order calculations in the QCD and electroweak interactions. The paper present the first next-to-next-to-leading order QCD computation of t¯tW production at hadron colliders.

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