Superconductivity in few-layer stanene

Liao, Menghan; Zang, Yunyi; Guan, Zhaoyong; Li, Haiwei; Gong, Yan; Zhu, Kejing; Hu, Xiao-Peng; Zhang, Ding; Xu, Yong; Wang, Ya-Yu; He, Ke; Ma, Xu-Cun; Zhang, Shou-Cheng; Xue, Qi-Kun

doi:10.1038/s41567-017-0031-6

Title: Superconductivity in few-layer stanene

Journal Article · Mon Jan 15 00:00:00 EST 2018 · Nature Physics

DOI:https://doi.org/10.1038/s41567-017-0031-6· OSTI ID:1438571

Liao, Menghan ^[1]; Zang, Yunyi ^[1]; Guan, Zhaoyong ^[1]; Li, Haiwei ^[1]; Gong, Yan ^[1]; Zhu, Kejing ^[1]; Hu, Xiao-Peng ^[2];

^[2]; Xu, Yong ^[3]; Wang, Ya-Yu ^[2]; He, Ke ^[2]; Ma, Xu-Cun ^[2]; Zhang, Shou-Cheng ^[4]; Xue, Qi-Kun ^[2]

Tsinghua Univ., Beijing (China). State Key Lab. of Low-Dimensional Quantum Physics and Dept. of Physics
Tsinghua Univ., Beijing (China). State Key Lab. of Low-Dimensional Quantum Physics and Dept. of Physics; Collaborative Innovation Center of Quantum Matter (CICQM), Beijing (China)
Tsinghua Univ., Beijing (China). State Key Lab. of Low-Dimensional Quantum Physics and Dept. of Physics; Collaborative Innovation Center of Quantum Matter (CICQM), Beijing (China); RIKEN Center for Emergent Matter Science (CEMS), Saitama (Japan)
Stanford Univ., CA (United States). Dept. of Physics

A single atomic slice of α-tin—stanene—has been predicted to host the quantum spin Hall effect at room temperature, offering an ideal platform to study low-dimensional and topological physics. Although recent research has focused on monolayer stanene, the quantum size effect in few-layer stanene could profoundly change material properties, but remains unexplored. By exploring the layer degree of freedom, we discover superconductivity in few-layer stanene down to a bilayer grown on PbTe, while bulk α-tin is not superconductive. Through substrate engineering, we further realize a transition from a single-band to a two-band superconductor with a doubling of the transition temperature. In situ angle-resolved photoemission spectroscopy (ARPES) together with first-principles calculations elucidate the corresponding band structure. The theory also indicates the existence of a topologically non-trivial band. Thus, our experimental findings open up novel strategies for constructing two-dimensional topological superconductors.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Ministry of Science and Technology (MOST) (China); National Natural Science Foundation of China (NSFC); Beijing Innovation Center for Future Chip (ICFC); Tsinghua Univ., Beijing (China); Thousand-Young-Talents Program (China)

Grant/Contract Number:: AC02-76SF00515; 2017YFA0304600; 2017YFA0302902; 11604176

OSTI ID:: 1438571

Journal Information:: Nature Physics, Vol. 14, Issue 4; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 153 works

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