Mn overlayers on PbTe(111): Substitutional adsorption and interface formation |
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作者姓名: | 吴海飞, 张寒洁, 陆赟豪, 鄢永红, 李海洋, 鲍世宁, 何丕模 |
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作者单位: | [1]Department of Physics, Zhejiang University, Hangzhou 310027, China; [2]Department of Physics, Shaoxing University, Shaoxing 312000, China; [3]Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China |
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基金项目: | Project supported by the National Natural Science Foundation of China(Grant Nos.11074214,51202149,and 11204180); the Natural Science Foun-dation of Zhejiang Province,China(Grant No.LQ12F04001); the Scientific Research Fund of Zhejiang Provincial Education Department,China(Grant No.Y201121234); the Ministry of Science and Technology of China |
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摘 要: | The formation of the Mn/Pb Te(111) interface is investigated by photoemission spectrum. The core level behavior of Mn 2p is consistent with Mn substitutional adsorption during the initial Mn deposition, forming a(√3 ×√3)R30?-Pb0.67Mn0.33 Te phase of the second layer. Further deposition of Mn can cause metallic Mn islands to cover the substitutional substrate. Ultraviolet photoemission measurements show that the Fermi level is shifted into the conduction band, indicating Ohmic contact formation at the Mn/Pb Te(111) interface. The valence band maximum associated with the Pb0.67Mn0.33 Te layer is located at 1.27 e V below the Fermi level, and a schematic electronic structure of the Mn/Pb Te(111)interface is given. The work function of the substituted substrate with Pb-covered Mn islands is determined to be 4.16 e V,in comparison with 4.35 e V for the Pb-covered substituted substrate and 3.95 e V for the pristine Pb Te(111) surface.
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关 键 词: | 金属锰 覆盖层 吸附相 PbTe 界面 代换 光电发射光谱 沉积过程 |
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