| Autor: |
Asaba, T., Naritsuka, M., Asaeda, H., Kosuge, Y., Ikemori, S., Suetsugu, S., Kasahara, Y., Kohsaka, Y., Terashima, T., Daido, A., Yanase, Y., Matsuda, Y. |
| Rok vydání: |
2024 |
| Předmět: |
|
| Zdroj: |
Nature Communications 15, 3861 (2024) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1038/s41467-024-47875-4 |
| Popis: |
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 {\cred electron} transport is the most {\cred powerful} probe for the finite-momentum pairs, {\cred 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 CeCoIn$_5$. 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 ${\bm H}$ applied to the antinodal direction of the $d$-wave gap, such an anomaly is absent for ${\bm H}$ along the nodal direction. By meticulously 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. |
| Databáze: |
arXiv |
| Externí odkaz: |
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