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题名: Origin of charge transfer and enhanced electron-phonon coupling in single unit-cell FeSe films on SrTiO3
作者: Zhang, Huimin1;  Zhang, Ding2, 3;  Lu, Xiaowei1, 4;  Liu, Chong2;  Zhou, Guanyu2;  Ma, Xucun2, 3;  Wang, Lili2, 3;  Jiang, Peng1, 5;  Xue, Qi-Kun2, 3;  Bao, Xinhe1, 5
刊名: NATURE COMMUNICATIONS
发表日期: 2017-08-09
DOI: 10.1038/s41467-017-00281-5
卷: 8
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology
类目[WOS]: Multidisciplinary Sciences
研究领域[WOS]: Science & Technology - Other Topics
英文摘要: Interface charge transfer and electron-phonon coupling have been suggested to play a crucial role in the recently discovered high-temperature superconductivity of single unit-cell FeSe films on SrTiO3. However, their origin remains elusive. Here, using ultraviolet photoemission spectroscopy and element-sensitive X-ray photoemission spectroscopy, we identify the strengthened Ti-O bond that contributes to the interface enhanced electron-phonon coupling and unveil the band bending at the FeSe/SrTiO3 interface that leads to the charge transfer from SrTiO3 to FeSe films. We also observe band renormalization that accompanies the onset of superconductivity. Our results not only provide valuable insights into the mechanism of the interface-enhanced superconductivity, but also point out a promising route toward designing novel superconductors in heterostructures with band bending-induced charge transfer and interfacial enhanced electron-phonon coupling.
关键词[WOS]: HIGH-TEMPERATURE SUPERCONDUCTIVITY ;  THIN-FILMS ;  PHOTOEMISSION-SPECTROSCOPY ;  DOPED SRTIO3 ;  65 K ;  SUBSTRATE
语种: 英语
WOS记录号: WOS:000407198800003
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/149937
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, CAS Ctr Excellence Nanosci, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China
3.Collaborat Innovat Ctr Quantum Matter, Beijing 100084, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China

Recommended Citation:
Zhang, Huimin,Zhang, Ding,Lu, Xiaowei,et al. Origin of charge transfer and enhanced electron-phonon coupling in single unit-cell FeSe films on SrTiO3[J]. NATURE COMMUNICATIONS,2017,8.
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