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Zhang HM, Sun Y, Li W, et al. Detection of a superconducting phase in a two-atom layer of hexagonal Ga film grown on semiconducting GaN(0001). Phys Rev Lett. 2015;114(10):107003doi: 10.1103/PhysRevLett.114.107003.
Zhang, H. M., Sun, Y., Li, W., Peng, J. P., Song, C. L., Xing, Y., Zhang, Q., Guan, J., Li, Z., Zhao, Y., Ji, S., Wang, L., He, K., Chen, X., Gu, L., Ling, L., Tian, M., Li, L., Xie, X. C., Liu, J., Yang, H., Xue, Q. K., Wang, J., & Ma, X. (2015). Detection of a superconducting phase in a two-atom layer of hexagonal Ga film grown on semiconducting GaN(0001). Physical review letters, 114(10), 107003. https://doi.org/10.1103/PhysRevLett.114.107003
Zhang, Hui-Min, et al. "Detection of a superconducting phase in a two-atom layer of hexagonal Ga film grown on semiconducting GaN(0001)." Physical review letters vol. 114,10 (2015): 107003. doi: https://doi.org/10.1103/PhysRevLett.114.107003
Zhang HM, Sun Y, Li W, Peng JP, Song CL, Xing Y, Zhang Q, Guan J, Li Z, Zhao Y, Ji S, Wang L, He K, Chen X, Gu L, Ling L, Tian M, Li L, Xie XC, Liu J, Yang H, Xue QK, Wang J, Ma X. Detection of a superconducting phase in a two-atom layer of hexagonal Ga film grown on semiconducting GaN(0001). Phys Rev Lett. 2015 Mar 13;114(10):107003. doi: 10.1103/PhysRevLett.114.107003. Epub 2015 Mar 10. PMID: 25815961.
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Phys Rev Lett. 2015 Mar 13;114(10):107003. doi: 10.1103/PhysRevLett.114.107003. Epub 2015 Mar 10.

Detection of a superconducting phase in a two-atom layer of hexagonal Ga film grown on semiconducting GaN(0001).

Physical review letters

Hui-Min Zhang, Yi Sun, Wei Li, Jun-Ping Peng, Can-Li Song, Ying Xing, Qinghua Zhang, Jiaqi Guan, Zhi Li, Yanfei Zhao, Shuaihua Ji, Lili Wang, Ke He, Xi Chen, Lin Gu, Langsheng Ling, Mingliang Tian, Lian Li, X C Xie, Jianping Liu, Hui Yang, Qi-Kun Xue, Jian Wang, Xucun Ma

Affiliations

  1. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
  2. International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.
  3. State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.
  4. Collaborative Innovation Center of Quantum Matter, 100084 Beijing, China.
  5. High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, Anhui, China.
  6. Department of Physics, University of Wisconsin, Milwaukee, Wisconsin 53211, USA.
  7. Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Jiangsu 215123, China.

PMID: 25815961 DOI: 10.1103/PhysRevLett.114.107003

Abstract

The recent observation of the superconducting state at atomic scale has motivated the pursuit of exotic condensed phases in two-dimensional (2D) systems. Here we report on a superconducting phase in two-monolayer crystalline Ga films epitaxially grown on wide-band-gap semiconductor GaN(0001). This phase exhibits a hexagonal structure and only 0.552 nm in thickness, nevertheless, brings about a superconducting transition temperature Tc as high as 5.4 K, confirmed by in situ scanning tunneling spectroscopy and ex situ electrical magnetotransport and magnetization measurements. The anisotropy of critical magnetic field and Berezinski-Kosterlitz-Thouless-like transition are observed, typical for the 2D superconductivity. Our results demonstrate a novel platform for exploring atomic-scale 2D superconductors, with great potential for understanding the interface superconductivity.

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