| 电子双势垒量子隧穿的散射矩阵方法及其数值模拟 |
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| 引用本文： | 杨军,武文远,龚艳春,戴斌飞,黄雁华.电子双势垒量子隧穿的散射矩阵方法及其数值模拟[J].大学物理,2008,27(7). |
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| 作者姓名： | 杨军 武文远 龚艳春 戴斌飞 黄雁华 |
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| 作者单位： | 解放军理工大学,理学院,数理系,江苏,南京,211101 |
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| 基金项目： | 解放军理工大学校科研和教改项目 |
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| 摘 要： | 采用散射矩阵的方法研究了电子在由两个方势垒组成的双势垒结构中的隧穿特性.将电子在双势垒中的隧穿过程分为相干输运和非相干输运两部分来研究,相干输运导致了隧穿透射系数随中间层厚度变化产生量子振荡,而非相干输运导致了振荡振幅的衰减.双势垒总的透射系数与势垒高度、入射和出射波矢的匹配性有关,数值计算的结果证实了相关结论.
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| 关 键 词： | 双势垒 量子隧穿 散射矩阵 相干输运 |
Scattering matrix method and numerical simulation for electronic quantum tunneling a double-barrier |
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| YANG Jun,WU Wen-yuan,GONG Yan-chun,DAI Bing-fei,HUANG Yan-hua.Scattering matrix method and numerical simulation for electronic quantum tunneling a double-barrier[J].College Physics,2008,27(7). |
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| Authors: | YANG Jun WU Wen-yuan GONG Yan-chun DAI Bing-fei HUANG Yan-hua |
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| Abstract: | Using the scattering matrix method,we study the characteristics of electronic tunneling a double square barrier.Taking into account the tunneling current with ballistic and diffusive components,we present the results of ballistic component for oscillation of the transmission coefficient,while the diffusive one leads to decay.It is shown that the overall transmission coefficient of the double-barrier potential is related to the height of potential barrier and the matching of incident wave and the out wave.The conclusions are confirmed by the numerical results. |
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| Keywords: | double-barrier quantum tunneling scattering matrix coherent transport |
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