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Direct observation of quantum vortex fractionalization in multiband superconductors

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arxiv 2407.18610 v3 pith:GP53EITN submitted 2024-07-26 cond-mat.supr-con

Yu Zheng , Quanxin Hu , Haijiao Ji , Igor Timoshuk , Hanxiang Xu , Yongwei Li , Ye Gao , Xin Yu
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Rui Wu Xingye Lu Vadim Grinenko Egor Babaev Noah F. Q. Yuan Baiqing Lv Chi-Ming Yim Hong Ding
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classification cond-mat.supr-con
keywords coremultibandquantumvortexfractionalsuperconductorvorticesflux
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Magnetic field is expelled from a superconductor, unless it forms quantum vortices, consisting of a core singularity with current circulating around it. The London quantization condition implies that there is one core singularity per quantum of magnetic flux in single-component superconductors, while in multiband materials fractional vortices are possible. Here, we report the first observation of quantum vortex core fractionalization on the potassium terminated surface of multiband superconductor KFe2As2 by scanning tunneling microscopy. We observe splitting of an integer-flux vortex into several fractional vortices, leading to disparity between numbers of flux quanta and vortex cores. Our findings demonstrate that fractionalized core singularities are possible in a multiband superconductor, opening avenue for new experimental platforms with quasiparticles with fractional statistics.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Multiple correlation lengths and type-1.5 superconductivity in $U(1)$ superconductors due to hidden competition between irreducible representations of nonlocal pairing

    cond-mat.supr-con 2025-11 conditional novelty 7.0 of 10

    A nominally single-component superconductor can exhibit type-1.5 vortex clustering because a suppressed competing pairing channel generates a second coherence length.

  2. Anisotropic and tunable vortex topology in multiband iron-based superconductors

    cond-mat.supr-con 2024-12 conditional novelty 7.0 of 10

    An in-plane magnetic-field vortex (x-vortex) in iron-based superconductors supports a simple topological phase with unpaired Majorana zero modes over a wide parameter range, unlike the previously studied z-vortex.

  3. Atomic-scale Frustrated Josephson Coupling and Multi-condensate Visualization in FeSe

    cond-mat.supr-con 2025-07 conditional novelty 6.0 of 10

    Scanning Josephson tunneling microscopy reveals frustrated Josephson interference between an Nb tip and two superconducting condensates in FeSe, with anti-correlated superfluid density modulations.

  4. Evidence of pseudogap and absence of spin magnetism in the time-reversal-symmetry-breaking state of Ba$_{1-x}$K$_x$Fe$_2$As$_2$

    cond-mat.supr-con 2025-01 conditional novelty 6.0 of 10

    75As NMR on Ba0.234K0.766Fe2As2 shows a pseudogap below T* of about 12 K above Tc and no spin-fluctuation enhancement at T_c^Z2, indicating the time-reversal-symmetry-broken state is nonmagnetic.

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