Evidence for a finite-momentum Cooper pair in tricolor $d$-wave superconducting superlattices
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866910441342500864 |
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| author | Asaba, T. Naritsuka, M. Asaeda, H. Kosuge, Y. Ikemori, S. Suetsugu, S. Kasahara, Y. Kohsaka, Y. Terashima, T. Daido, A. Yanase, Y. Matsuda, Y. |
| author_facet | Asaba, T. Naritsuka, M. Asaeda, H. Kosuge, Y. Ikemori, S. Suetsugu, S. Kasahara, Y. Kohsaka, Y. Terashima, T. Daido, A. Yanase, Y. Matsuda, Y. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_16496 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Evidence for a finite-momentum Cooper pair in tricolor $d$-wave superconducting superlattices Asaba, T. Naritsuka, M. Asaeda, H. Kosuge, Y. Ikemori, S. Suetsugu, S. Kasahara, Y. Kohsaka, Y. Terashima, T. Daido, A. Yanase, Y. Matsuda, Y. Superconductivity Strongly Correlated Electrons 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. |
| title | Evidence for a finite-momentum Cooper pair in tricolor $d$-wave superconducting superlattices |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2403.16496 |