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Experimental evidence of surface copper boride

Nano Research 2023年第7期16卷 9602-9607页

作者： Xiao-Ji Weng Jie Bai Jingyu Hou Yi Zhu Li Wang Penghui Li Anmin Nie Bo Xu Xiang-Feng Zhou Yongjun Tian Center for High Pressure Science State Key Laboratory of Metastable Materials Science and TechnologySchool of ScienceYanshan UniversityQinhuangdao 066004China Key Laboratory of Weak-Light Nonlinear Photonics and School of Physics Nankai UniversityTianjin 300071China vacuum Interconnected Nanotech Workstation Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China

To validate the crystal structure and elucidate the formation mechanism of the unexpected surface copper boride,a systematic scanning tunneling microscope,X-ray photoelectron spectroscopy,angle-resolved photoemission spectroscopy,and aberrationcorrected scanning transmission electron microscopy investigations were conducted to confirm the structure of copper-rich boride Cu_(8)B_(14)after depositing boron on single-crystal Cu(111)surface under ultrahigh vacuum.First-principles calculations with defective surface models further indicate that boron atoms tend to react with Cu atoms near terrace edges or defects,which in turn shapes the intermediate structures of copper boride and leads to the formation of stable Cu-B monolayer via large-scale surface reconstruction eventually.

关键词： copper boride surface science ultrahigh vacuum structure characterization first principles formation mechanism

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Molecular beam epitaxy growth of quantum devices

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Chinese Physics B 2022年第12期31卷 430-433页

作者：何珂 State Key Laboratory of Low-Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China Frontier Science Center for Quantum Information Beijing 100084China Beijing Institute of Quantum Information Science Beijing 100193China

The inherent fragility and surface/interface-sensitivity of quantum devices demand fabrication techniques under very clean environment.Here,I briefly introduces several techniques based on molecular beam epitaxy growth on pre-patterned substrates which enable us to directly prepare in-plane nanostructures and heterostructures in ultrahigh vacuum.The molecular beam epitaxy-based fabrication techniques are especially useful in constructing the high-quality devices and circuits for solid-state quantum computing in a scalable way.

关键词： molecular beam epitaxy fabrication ultrahigh vacuum quantum computation

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EXPERIMENTAL RESEARCHES ON LIGHTNING IMPULSE CORONA CHARACTERISTICS OF UHV CONDUCTORS

EXPERIMENTAL RESEARCHES ON LIGHTNING IMPULSE CORONA CHARACTE...

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The ⅪⅩ International Conference on Gas Discharges and Their Applications

作者： XU TAO XIE XIONGJIE YE QIMING XIE LIANG YANG PENGCHENG Electric Power Research Institute

ISBN: (纸本)9771003651221

＜正＞When lightning strike occurs at transmission lines,the lightning waves go into the substations along with the transmission lines and have great harmful effect on the equipments.The proper lighting insulations could protect equipments from broken down by lighting.In China,the designs of lightning insulations often ignore the effect of impulse corona on transmission lines. As the impulse corona could lead large attenuation and distortion to the lightning waves, the margins of the traditional designs are great. For the UHV power system,the great margins will lead to much greater cost of insulations.In this paper,series experiments were carried out in China UHV AC test base and Q-V characteristics curves of UHV conductors were obtained. Lighting impulse corona empirical equation of UHV conductors is proposed.In the end of this paper,an impulse corona model based on the test results is established,which could be used in electromagnetic transient calculation software.

关键词： Transmission Lines Lightning Pulses coronas Insulation ultrahigh vacuum conducting bodies Lighting corona Power cables Lightning Stroke Clinical Test Result Substations

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