Bibliographic Details
| Title: |
Spin triplet superconducting proximity effect in a ferromagnetic semiconductor |
| Authors: |
Nakamura, Taketomo, Anh, Le Duc, Hashimoto, Yoshiaki, Ohya, Shinobu, Tanaka, Masaaki, Katsumoto, Shingo |
| Source: |
Phys. Rev. Lett. 122, 107001 (2019) |
| Publication Year: |
2018 |
| Collection: |
Condensed Matter |
| Subject Terms: |
Condensed Matter - Mesoscale and Nanoscale Physics |
| More Details: |
Conventional spin-singlet superconductivity that deeply penetrates into ferromagnets is typically killed by the exchange interaction, which destroys the spin-singlet pairs. Under certain circumstances, however, superconductivity survives this interaction by adopting the pairing behavior of spin triplets. The necessary conditions for the emergence of triplet pairs are well-understood, owing to significant developments in theoretical frameworks and experiments. The long-term challenges to inducing superconductivity in magnetic semiconductors, however, involve difficulties in observing the finite supercurrent, even though the generation of superconductivity in host materials has been well-established and extensively examined. Here, we show the first evidence of proximity-induced superconductivity in a ferromagnetic semiconductor (In, Fe)As. The supercurrent reached a distance scale of $\sim 1~\mu$m, which is comparable to the proximity range in two-dimensional electrons at surfaces of pure InAs. Given the long range of its proximity effects and its response to magnetic fields, we conclude that spin-triplet pairing is dominant in proximity superconductivity. Therefore, this progress in ferromagnetic semiconductors is a breakthrough in semiconductor physics involving unconventional superconducting pairing.
Comment: 5 pages, 5 figures |
| Document Type: |
Working Paper |
| DOI: |
10.1103/PhysRevLett.122.107001 |
| Access URL: |
http://arxiv.org/abs/1806.08035 |
| Accession Number: |
edsarx.1806.08035 |
| Database: |
arXiv |
