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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.
Afiliación
  • Asaba T; Department of Physics, Kyoto University, Kyoto, 606-8502, Japan. asaba.tomoya.4t@kyoto-u.ac.jp.
  • Naritsuka M; Department of Physics, Kyoto University, Kyoto, 606-8502, Japan.
  • Asaeda H; RIKEN Center for Emergent Matter Science, Wako, Saitama, 351-0198, Japan.
  • Kosuge Y; Department of Physics, Kyoto University, Kyoto, 606-8502, Japan.
  • Ikemori S; Department of Physics, Kyoto University, Kyoto, 606-8502, Japan.
  • Suetsugu S; Department of Physics, Kyoto University, Kyoto, 606-8502, Japan.
  • Kasahara Y; Department of Physics, Kyoto University, Kyoto, 606-8502, Japan.
  • Kohsaka Y; Department of Physics, Kyoto University, Kyoto, 606-8502, Japan.
  • Terashima T; Department of Physics, Kyoto University, Kyoto, 606-8502, Japan.
  • Daido A; Department of Physics, Kyoto University, Kyoto, 606-8502, Japan.
  • Yanase Y; Department of Physics, Kyoto University, Kyoto, 606-8502, Japan.
  • Matsuda Y; Department of Physics, Kyoto University, Kyoto, 606-8502, Japan.
Nat Commun ; 15(1): 3861, 2024 May 08.
Article en En | MEDLINE | ID: mdl-38719822
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.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nat Commun Asunto de la revista: BIOLOGIA / CIENCIA Año: 2024 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nat Commun Asunto de la revista: BIOLOGIA / CIENCIA Año: 2024 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Reino Unido