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Evidence for a finite-momentum Cooper pair in tricolor d-wave superconducting superlattices

Author

Listed:
  • T. Asaba

    (Kyoto University)

  • M. Naritsuka

    (Kyoto University
    RIKEN Center for Emergent Matter Science)

  • H. Asaeda

    (Kyoto University)

  • Y. Kosuge

    (Kyoto University)

  • S. Ikemori

    (Kyoto University)

  • S. Suetsugu

    (Kyoto University)

  • Y. Kasahara

    (Kyoto University)

  • Y. Kohsaka

    (Kyoto University)

  • T. Terashima

    (Kyoto University)

  • A. Daido

    (Kyoto University)

  • Y. Yanase

    (Kyoto University)

  • Y. Matsuda

    (Kyoto University)

Abstract

Fermionic superfluidity with a nontrivial Cooper-pairing, beyond the conventional Bardeen-Cooper-Schrieffer state, is a captivating field of study in quantum many-body systems. In particular, the search for superconducting states with finite-momentum pairs has long been a challenge, but establishing its existence has long suffered from the lack of an appropriate probe to reveal its momentum. Recently, it has been proposed that the nonreciprocal electron transport is the most powerful probe for the finite-momentum pairs, because it directly couples to the supercurrents. Here we reveal such a pairing state by the non-reciprocal transport on tricolor superlattices with strong spin-orbit coupling combined with broken inversion-symmetry consisting of atomically thin d-wave superconductor CeCoIn5. We find that while the second-harmonic resistance exhibits a distinct dip anomaly at the low-temperature (T)/high-magnetic field (H) corner in the HT-plane for H applied to the antinodal direction of the d-wave gap, such an anomaly is absent for H along the nodal direction. By carefully isolating extrinsic effects due to vortex dynamics, we reveal the presence of a non-reciprocal response originating from intrinsic superconducting properties characterized by finite-momentum pairs. We attribute the high-field state to the helical superconducting state, wherein the phase of the order parameter is spontaneously spatially modulated.

Suggested Citation

  • T. Asaba & M. Naritsuka & H. Asaeda & Y. Kosuge & S. Ikemori & S. Suetsugu & Y. Kasahara & Y. Kohsaka & T. Terashima & A. Daido & Y. Yanase & Y. Matsuda, 2024. "Evidence for a finite-momentum Cooper pair in tricolor d-wave superconducting superlattices," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47875-4
    DOI: 10.1038/s41467-024-47875-4
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    References listed on IDEAS

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