Ultrathin Bismuth Film on High-Temperature Cuprate Superconductor Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8+δ</sub> as a Candidate of a Topological Superconductor
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- Natsumi Shimamura
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
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- Katsuaki Sugawara
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
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- Sukrit Sucharitakul
- RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan
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- Seigo Souma
- WPI-Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
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- Katsuya Iwaya
- RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan
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- Kosuke Nakayama
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
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- Chi Xuan Trang
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
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- Kunihiko Yamauchi
- Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan
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- Tamio Oguchi
- Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan
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- Kazutaka Kudo
- Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
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- Takashi Noji
- Department of Applied Physics, Tohoku University, Sendai 980-8579, Japan
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- Yoji Koike
- Department of Applied Physics, Tohoku University, Sendai 980-8579, Japan
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- Takashi Takahashi
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
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- Tetsuo Hanaguri
- RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan
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- Takafumi Sato
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
書誌事項
- 公開日
- 2018-10-17
- 資源種別
- journal article
- DOI
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- 10.1021/acsnano.8b04869
- 公開者
- American Chemical Society (ACS)
この論文をさがす
説明
One of the key challenges in condensed-matter physics is to establish a topological superconductor that hosts exotic Majorana fermions. Although various heterostructures consisting of conventional BCS (Bardeen-Cooper-Schrieffer) superconductors as well as doped topological insulators were intensively investigated, no conclusive evidence for Majorana fermions has been provided. This is mainly because of their very low superconducting transition temperatures ( Tc) and small superconducting-gap magnitude. Here, we report a possible realization of topological superconductivity at very high temperatures in a hybrid of Bi(110) ultrathin film and copper oxide superconductor Bi2Sr2CaCu2O8+δ (Bi2212). Using angle-resolved photoemission spectroscopy and scanning tunneling microscopy, we found that three-bilayer-thick Bi(110) on Bi2212 exhibits a proximity-effect-induced s-wave energy gap as large as 7.5 meV which persists up to Tc of Bi2212 (85 K). The small Fermi energy and strong spin-orbit coupling of Bi(110), together with the large pairing gap and high Tc, make this system a prime candidate for exploring stable Majorana fermions at very high temperatures.
収録刊行物
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- ACS Nano
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ACS Nano 12 (11), 10977-10983, 2018-10-17
American Chemical Society (ACS)
