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Showing 1–14 of 14 results
Advanced filters: Author: Joachim Ankerhold Clear advanced filters

  • The Yu-Shiba-Rusinov state, arising from exchange coupling between a magnetic impurity and a superconductor, undergoes a quantum phase transition at a critical coupling. In a scanning tunnelling microscopy experiment, Karan et al. reveal distinct tunnelling spectra on each side of the transition in a magnetic field, which allows them to distinguish the free spin regime from the screened spin regime.

    • Sujoy Karan
    • Haonan Huang
    • Christian R. Ast
    ResearchOpen Access
    Nature Communications
    Volume: 15, P: 1-7

  • Magnetic impurities on superconductors lead to bound states within the superconducting gap, so called Yu-Shiba-Rusinov (YSR) states. Here, the authors study tunneling from a vanadium STM tip to a V(100) surface and show that YSR states can be excited at very low temperature by applying a microwave signal.

    • Janis Siebrecht
    • Haonan Huang
    • Christian R. Ast
    ResearchOpen Access
    Nature Communications
    Volume: 14, P: 1-6

  • A magnetic impurity is placed on the tip of a scanning tunnelling microscope, allowing direct tunnelling between two Yu–Shiba–Rusinov bound states. This technique can probe and enhance the impurity state lifetime.

    • Haonan Huang
    • Ciprian Padurariu
    • Christian R. Ast
    Research
    Nature Physics
    Volume: 16, P: 1227-1231

  • Heat transport control in superconducting circuits has received increasing attention in microwave engineering for circuit quantum electrodynamics, particularly in light of quantum computing. The authors realise of a quantum heat rectifier, a thermal equivalent to the electronic diode, experimentally realising a spin-boson rectifier proposed theoretically.

    • Jorden Senior
    • Azat Gubaydullin
    • Jukka P. Pekola
    ResearchOpen Access
    Communications Physics
    Volume: 3, P: 1-5

  • Many features of a superconductor are encoded in the Josephson effect and understanding changes at the local level can help explain related phenomena. Here, the authors use scanning tunnelling microscopy to study local changes in the Josephson effect and how they relate to the transport channel configuration.

    • Jacob Senkpiel
    • Simon Dambach
    • Klaus Kern
    ResearchOpen Access
    Communications Physics
    Volume: 3, P: 1-6

  • The tunnelling current in scanning tunnelling spectroscopy has often been treated by a continuous charge flow, which lacks proper treatment of charge quantization. Here, Ast et al. unveil the effects of granularity in the tunnelling current at extremely low temperatures by including P(E) theory, thereby reaching the quantum limit in scanning tunnelling spectroscopy.

    • Christian R. Ast
    • Berthold Jäck
    • Klaus Kern
    ResearchOpen Access
    Nature Communications
    Volume: 7, P: 1-8

  • Continuously changing the coupling between a magnetic impurity and a superconductor allows the observation of the reversal of supercurrent flow at the atomic scale.

    • Sujoy Karan
    • Haonan Huang
    • Christian R. Ast
    ResearchOpen Access
    Nature Physics
    Volume: 18, P: 893-898

  • Cathelicidins are antimicrobial peptides that eliminate pathogens and contribute to the innate immune response. Here the authors show that neutrophil-derived LL-37/CRAMP induces platelet activation and promotes arterial thrombosis and thrombo-inflammation.

    • Joachim Pircher
    • Thomas Czermak
    • Christian Schulz
    ResearchOpen Access
    Nature Communications
    Volume: 9, P: 1-15

  • Breakdown of vascular barriers is a major complication of inflammatory diseases. However, the mechanisms underlying platelet recruitment to inflammatory micro-environments remains unclear. Here, the authors identify haptotaxis as a key effector function of immune-responsive platelets

    • Leo Nicolai
    • Karin Schiefelbein
    • Florian Gaertner
    ResearchOpen Access
    Nature Communications
    Volume: 11, P: 1-16

  • Magnetic impurities can induce a range of exotic phenomena, including the famous Kondo effect in metallic systems and bound states in superconductors. Here, using scanning tunneling microscopy, the authors investigate magnetic impurities on a superconducting vanadium tip and analyse the scaling between the Yu-Shiba-Rusinov state energy and the Kondo temperature.

    • Haonan Huang
    • Sujoy Karan
    • Christian R. Ast
    ResearchOpen Access
    Communications Physics
    Volume: 6, P: 1-7

  • The physics of Yu-Shiba-Rusinov states which exist in the superconducting gap are a topical area of research and linked to exotic phenomena such as Majorana fermions. Here, the authors use scanning tunnelling microscopy to investigate the influence of impurities on a superconducting surface and the role impurity-substrate hybridisation has on such states.

    • Haonan Huang
    • Robert Drost
    • Christian R. Ast
    ResearchOpen Access
    Communications Physics
    Volume: 3, P: 1-9