| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Growth of Ag on Pb Island with Si(111) Substrate |
| Xiao-Peng Hu1,2,3, Rui Zhu1,3, Jun Xu1,3, Shuai-Hua Ji2,3**, Xi Chen2,3, Qi-Kun Xue2,3, Da-Peng Yu1,3 |
1State Key Laboratory for Mesoscopic Physics and Electron Microscopy Laboratory, School of Physics, Peking University, Beijing 100871
2State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084
3Collaborative Innovation Center of Quantum Matter, Beijing 100084
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| Cite this article: |
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Xiao-Peng Hu, Rui Zhu, Jun Xu et al 2016 Chin. Phys. Lett. 33 078101 |
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Abstract We study the growth of Ag on Pb island surface with low temperature scanning tunnelling microscopy. Two growth modes, the subsurface island mode and the surface alloy mode, are observed on the substrate at room temperature and at 100 K, respectively. In the surface alloy mode, the perfect alloy AgPb$_2$ is formed on the Pb island surface after annealing. The two growth modes at different substrate temperatures are attributed to the existence of an exchange barrier of Ag atoms on the Pb island surface. The modulation of the exchange barrier by the quantum well states is also observed on the Pb island.
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Received: 14 April 2016
Published: 01 August 2016
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| PACS: |
81.15.Hi
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(Molecular, atomic, ion, and chemical beam epitaxy)
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07.79.Fc
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(Near-field scanning optical microscopes)
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68.35.Md
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(Surface thermodynamics, surface energies)
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81.07.St
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(Quantum wells)
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