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共振隧穿中的能级耦合研究
发表时间：2008-04-15 浏览量：2181 下载量：657
| 全部作者： | 贾国治，姚江宏 |
| 作者单位： | 天津城市建设学院；南开大学泰达应用物理学院 |
| 摘 要： | 本文通过传输矩阵的方法数值求解薛定谔方程，研究了垒在阱中结构的共振隧穿过程，及垒对能级耦合的影响。结果表明，影响透射强度的关键因子是中间势垒的厚度和第二个阱的宽度。同时研究了结构参数对透射几率的影响。其结果表明，对称性可能在量子阱之间的能级耦合中扮演主要角色。理论上模拟了电子共振隧穿过程中，量子阱中间势垒对量子阱之间能级耦合的影响。分析表明，中心势垒厚度和第二个阱的宽度是影响透射强度和能级的主要参数。1.9 eV的共振峰能级保持常数，对应第一量子阱的基态能级。第二个透射峰随第二个阱宽增加而变化，当两个阱的宽度相同时,透射几率最大。 |
| 关 键 词： | 低维物理；共振隧穿；能级耦合；传输矩阵 |
| Title： | Study of energy coupling in resonant tunneling process |
| Author： | JIA Guozhi，YAO Jianghong |
| Organization： | Tianjin Institute of Urban Construction；TEDA Applied Physics School, Nankai University |
| Abstract： | A Schr錸dinger equation has been solved numerically for a barrier in a quantum well by the transfer matrix technique to analyze resonant tunneling process of electronics theoretically. Effects of the middle barrier on energy coupling between quantum wells were investigated. The result of analysis showed that the key factor affect the transmission intensity and energy was the thickness of the middle barrier and the width of the second quantum well. Effect of structure parameters on the transmission probabilities were investigated in detail. The results suggested that the symmetry should play an important role in coupling effect between the quantum wells. The resonant energy peak with 1.9 eV kept being constant, which can correspond with the ground state energy level of the first quantum well. The other transmission peak varied with the increase of width of the second quantum well. When the widths of the two wells were the same, the transmission probability was the maximum. |
| Key words： | low dimensional physics; resonant tunneling; energy couple; transfer matrix |
| 发表期数： | 2008年8月第7期 |
| 引用格式： | 贾国治，姚江宏. 共振隧穿中的能级耦合研究[J]. 中国科技论文在线精品论文，2008，1（7）：834-837. |
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