摘要
研究两端连接电子库的量子线在太赫兹 (THz)电磁场横向辐射下的电子力学问题 .在自由电子近似下求得了弹道区二能级电子波函数解析表达式 ,发现电子概率在两个能态间随线轴坐标作Rabi振荡 ,其幅度与外场强度和频率有关 .利用热力学统计算符方法并利用波函数计算出了传导电子对量子线中张力贡献的大小 .其计算结果可表示成与外场无关和与外场有关的两部分之和 ,前者与已有的实验观测和理论计算结果一致 ,而与外场参量有关的部分可用量子相干理论解释 .
We study the nanoelectromechanics in a quantum wire connecting two reservoirs irradiated under an external terahertz (THz) electromagnetic field. Using the free-electron model at ballistic regime we calculated the two-level electron wavefunction and the Rabi oscillation of electron probability between the two levels. Using a statistical operator we calculated the nanoelectronic force in the wire. The result consists of two terms, which corresponds to the case with or without external field. The term without field parameter is consistent with the existing experimental observation and theoretical calculation, and the other term from the external field can be explained by the quantum coherent theory.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2003年第8期2037-2040,共4页
Acta Physica Sinica
基金
湖南省自然科学基金 (批准号 :0 2JJY2 0 0 8)
湖南师范大学科研基金 (批准号 :0 0 0 62 7)资助的课题 .~~
