| 杂质和粗糙界面散射影响下NIS结的隧道谱和束缚态 |
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| 引用本文： | 魏健文.杂质和粗糙界面散射影响下NIS结的隧道谱和束缚态[J].河南师范大学学报(自然科学版),2006,34(4):79-83. |
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| 作者姓名： | 魏健文 |
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| 作者单位： | 淮阴师范学院,物理系,江苏,淮安,223001 |
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| 基金项目： | 江苏省教育厅自然科学基金 |
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| 摘 要： | 在正常金属/绝缘层/s波超导隧道结中,考虑绝缘层中的体杂质散射以及粗糙界面散射,运用Blon-der-Tinkham-Klapwijk(BTK)理论和Bogoliubov-de Gennes(BdG)方程,计算系统的微分电导.计算表明:(1)电导峰的位置与绝缘层的厚度密切相关,当绝缘层厚度具有几个相干长度时,隧道谱中的能级谐振峰数目增多,从而在超导能隙内形成一些束缚态;(2)粗糙界面散射和绝缘层中的杂质散射均能有效地压低电导峰,由此可解释理论与实验间尚存的偏差.
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| 关 键 词： | NIS结 杂质散射 粗糙界面散射 隧道谱 束缚态 |
| 文章编号： | 1000-2367(2006)04-0079-05 |
| 收稿时间： | 2005-11-04 |
| 修稿时间： | 2006-05-20 |
The Tunneling Spectra and Bound State of NIS Junctions under the Influence of the Impurities and Rough Interface Scattering |
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| WEI Jian-wen.The Tunneling Spectra and Bound State of NIS Junctions under the Influence of the Impurities and Rough Interface Scattering[J].Journal of Henan Normal University(Natural Science),2006,34(4):79-83. |
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| Authors: | WEI Jian-wen |
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| Institution: | Department of Physics, Huaiyin Teachers College, Huaian 223001 ,China |
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| Abstract: | Taking into account the impurities scattering in the insulating layer and rough interface scattering in the normal metal/insulating layer/s-wave superconductor tunnel junctions,using Blonder-Tinkham-Klapwijk(BTK)theory and Bogoliubove-de Gannes(BdG) eguations,We calculate the differential conductance.It is found that(1)the position of the conductance peaks is related to the insulating layer thickness intimately,the number of the energy level resonant peak in the tunneling spectra increase when the insulating layer has several coherence lengths,thus some bound states within the energy gap are formed;(2)both the interface roughness scattering and the impurities scattering in the insulating layer can abate the conductance peaks effectively,the deviation between theory and experiment can be explained thereby. |
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| Keywords: | NIS junctions impurities scattering rough interface scattering tunneling spectra bound state |
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