| 正常金属/绝缘层/s波超导隧道结中的隧道谱 |
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| 引用本文： | 魏健文.正常金属/绝缘层/s波超导隧道结中的隧道谱[J].华中师范大学学报(自然科学版),2004,38(3):297-300. |
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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： | 江苏省教委自然科学基金资助课题(00KJD140003). |
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| 摘 要： | 以方势垒描述绝缘层,考虑正常金属区域的杂质散射,运用Bogoliubov-deGennes(BdG)方程和Blonder-Tinkham-Klapwijk(BTK)理论,对正常金属/绝缘层/s波超导隧道结(NIS结)中的隧道谱作进一步研究.研究表明:(1)在U0>EF的情况下,微分电导随绝缘层宽度的增加而衰减,偏压不同,衰减的程度不同;(2)衰减能压低能隙电导峰;(3)较小的杂质散射即能在隧道谱的零偏压凹陷峰中感应出一小峰.
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| 关 键 词： | NIS结 方势垒 隧道谱 |
| 文章编号： | 1000-1190(2004)03-0297-04 |
Tunneling spectrum in the normal metal/insulating layer/s-wave superconductor tunnel junctions |
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| WEI Jian-wen.Tunneling spectrum in the normal metal/insulating layer/s-wave superconductor tunnel junctions[J].Journal of Central China Normal University(Natural Sciences),2004,38(3):297-300. |
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| Authors: | WEI Jian-wen |
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| Abstract: | Taking into account the impurities scattering in the normal metal region, using square-potential barrier to describe the insulating layer, we study further the tunneling spectrum of the normal metal/insulating layer/s-wave superconductor tunnel junctions making use of Bogoliubov-de Gennes(BdG) equation and Blonder-Tinkham-Klapwijk(BTK) theory. It is found that: (1) The change of the differential conductance with insulating layer width takes the form of attenuation when U_0>E_F, and the degree of attenuation is different under different bias; (2) The attenuation can abate the conductance peak at the energy gap; (3) The zero-bias conductance dip of the tunneling spectrum can be induced a small peak by a little impurities scattering. |
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| Keywords: | NIS junctions square-potential barrier tunneling spectrum |
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