ジャーナル論文 Anisotropic transport of Josephson vortices in atomic-layer superconductors on vicinal surfaces
Wenxuan Qian (author) (この著者で検索)
;
Yash Chauhan (author) (この著者で検索)
ORCID https://orcid.org/0009-0000-9371-2813 (unauthenticated)
ORCID ; ORCID SAMURAI ; ORCID SAMURAI ; ORCID SAMURAI ; ORCID SAMURAI
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引用
Wenxuan Qian, Yash Chauhan, Ryohei Nemoto, Keisuke Sagisaka, Shunsuke Yoshizawa, Takashi Uchihashi. Anisotropic transport of Josephson vortices in atomic-layer superconductors on vicinal surfaces. Physical Review B. 2026, 114 (5), 055422. https://doi.org/10.1103/b2j3-xj19

説明:

(abstract)

Atomic steps have strong influences on surface two-dimensional superconductors. Josephson vortices formed at the atomic steps under magnetic fields may dominate transport phenomena at low temperatures, but its experimental verification is still lacking. Here, we report the vortex transport properties of atomic-layer superconductor Si(111)-(root7xroot3)-In with vicinal surfaces, for which Josephson vortices are directly observed by scanning tunneling microscopy. A sharp drop in resistance with decreasing temperature T, detected under out-of-plane magnetic field B, reveals a distinctive anisotropy with respect to the atomic step direction. The anisotropy of sheet resistance, proportional to that of vortex mobility, amounts to the order of 10^3 at intermediate magnetic fields. In the high-T and low-B region, Josephson vortices exhibit thermally excited creep motions with anisotropic activation energy U_act. A further increase in B suppresses U_act toward zero anisotropically, resulting in one-dimensional pinning-free vortex flow at 0.10 < B < 0.20 T. At the lowest temperatures, the vortex motion is governed by quantum tunneling. A B-T phase diagram constructed based on these measurements reveals multiple regions characterized by directionally dependent vortex-transport mechanisms.

権利情報:

キーワード: superconductivity, surface, atomic step, Josephson vortex, transport, anisotropy

刊行年月日: 2026-07-30

出版者: American Physical Society (APS)

掲載誌:

  • Physical Review B (ISSN: 24699950) vol. 114 issue. 5 055422

研究助成金:

  • Japan Society for the Promotion of Science 25H00867
  • Japan Society for the Promotion of Science 24K01351
  • Japan Society for the Promotion of Science 22H01961
  • Japan Society for the Promotion of Science 25K01670
  • Ministry of Education, Culture, Sports, Science and Technology

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6434

公開URL: https://doi.org/10.1103/b2j3-xj19

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更新時刻: 2026-08-03 09:07:51 +0900

MDRでの公開時刻: 2026-08-03 10:28:56 +0900

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