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High-quality monolayer superconductor NbSe2 grown by chemical vapour deposition.
Nature Communications ( IF 14.7 ) Pub Date : 2017-08-30 , DOI: 10.1038/s41467-017-00427-5 Hong Wang , Xiangwei Huang , Junhao Lin , Jian Cui , Yu Chen , Chao Zhu , Fucai Liu , Qingsheng Zeng , Jiadong Zhou , Peng Yu , Xuewen Wang , Haiyong He , Siu Hon Tsang , Weibo Gao , Kazu Suenaga , Fengcai Ma , Changli Yang , Li Lu , Ting Yu , Edwin Hang Tong Teo , Guangtong Liu , Zheng Liu
Nature Communications ( IF 14.7 ) Pub Date : 2017-08-30 , DOI: 10.1038/s41467-017-00427-5 Hong Wang , Xiangwei Huang , Junhao Lin , Jian Cui , Yu Chen , Chao Zhu , Fucai Liu , Qingsheng Zeng , Jiadong Zhou , Peng Yu , Xuewen Wang , Haiyong He , Siu Hon Tsang , Weibo Gao , Kazu Suenaga , Fengcai Ma , Changli Yang , Li Lu , Ting Yu , Edwin Hang Tong Teo , Guangtong Liu , Zheng Liu
The discovery of monolayer superconductors bears consequences for both fundamental physics and device applications. Currently, the growth of superconducting monolayers can only occur under ultrahigh vacuum and on specific lattice-matched or dangling bond-free substrates, to minimize environment- and substrate-induced disorders/defects. Such severe growth requirements limit the exploration of novel two-dimensional superconductivity and related nanodevices. Here we demonstrate the experimental realization of superconductivity in a chemical vapour deposition grown monolayer material-NbSe2. Atomic-resolution scanning transmission electron microscope imaging reveals the atomic structure of the intrinsic point defects and grain boundaries in monolayer NbSe2, and confirms the low defect concentration in our high-quality film, which is the key to two-dimensional superconductivity. By using monolayer chemical vapour deposited graphene as a protective capping layer, thickness-dependent superconducting properties are observed in as-grown NbSe2 with a transition temperature increasing from 1.0 K in monolayer to 4.56 K in 10-layer.Two-dimensional superconductors will likely have applications not only in devices, but also in the study of fundamental physics. Here, Wang et al. demonstrate the CVD growth of superconducting NbSe2 on a variety of substrates, making these novel materials increasingly accessible.
中文翻译:
通过化学气相沉积法生长的高质量单层超导体NbSe2。
单层超导体的发现对基础物理和器件应用都有影响。当前,超导单层的生长只能在超高真空下和特定晶格匹配或无悬挂键的底物上发生,以最大程度地减少环境和底物引起的疾病/缺陷。这种严重的增长要求限制了对新型二维超导性和相关纳米器件的探索。在这里,我们演示了在化学气相沉积生长的单层材料-NbSe 2中超导性的实验实现。原子分辨率扫描透射电子显微镜成像揭示单层NbSe 2中本征点缺陷和晶界的原子结构,并确认了我们高质量薄膜中的低缺陷浓度,这是二维超导性的关键。通过使用单层化学气相沉积的石墨烯作为保护性覆盖层,在生长的NbSe 2中观察到了厚度相关的超导特性,其转变温度从单层的1.0 K增加到10层的4.56 K.不仅在设备中有应用,而且在基础物理学的研究中也有应用。在这里,王等。证明了超导NbSe2在各种衬底上的CVD生长,使这些新型材料越来越容易获得。
更新日期:2017-08-30
中文翻译:
通过化学气相沉积法生长的高质量单层超导体NbSe2。
单层超导体的发现对基础物理和器件应用都有影响。当前,超导单层的生长只能在超高真空下和特定晶格匹配或无悬挂键的底物上发生,以最大程度地减少环境和底物引起的疾病/缺陷。这种严重的增长要求限制了对新型二维超导性和相关纳米器件的探索。在这里,我们演示了在化学气相沉积生长的单层材料-NbSe 2中超导性的实验实现。原子分辨率扫描透射电子显微镜成像揭示单层NbSe 2中本征点缺陷和晶界的原子结构,并确认了我们高质量薄膜中的低缺陷浓度,这是二维超导性的关键。通过使用单层化学气相沉积的石墨烯作为保护性覆盖层,在生长的NbSe 2中观察到了厚度相关的超导特性,其转变温度从单层的1.0 K增加到10层的4.56 K.不仅在设备中有应用,而且在基础物理学的研究中也有应用。在这里,王等。证明了超导NbSe2在各种衬底上的CVD生长,使这些新型材料越来越容易获得。