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

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 p...

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Bibliographic Details
Published in:Physical review letters 2015-03, Vol.114 (10), p.107003-107003, Article 107003
Main Authors: Zhang, Hui-Min, Sun, Yi, Li, Wei, Peng, Jun-Ping, Song, Can-Li, Xing, Ying, Zhang, Qinghua, Guan, Jiaqi, Li, Zhi, Zhao, Yanfei, Ji, Shuaihua, Wang, Lili, He, Ke, Chen, Xi, Gu, Lin, Ling, Langsheng, Tian, Mingliang, Li, Lian, Xie, X C, Liu, Jianping, Yang, Hui, Xue, Qi-Kun, Wang, Jian, Ma, Xucun
Format: Article
Language:English
Subjects:
Crystal structure
Epitaxial growth
Magnetic fields
Magnetization
Semiconductors
Superconductivity
Transition temperature
Two dimensional
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.114.107003