电场和线度对纳米管电子量子跃迁矩阵元的影响  

On Influence of Electric Field and Size on Electronic Quantum Transition Matrix Element of Semiconductor Nanotube

作　　者：吴强[1] 

机构地区：[1]重庆文理学院电子电气工程学院,重庆402160

出　　处：《西南师范大学学报（自然科学版）》2014年第3期25-31,共7页Journal of Southwest China Normal University(Natural Science Edition)

基　　金：重庆市教育委员会科学技术研究基金(KJ121209)资助的课题

摘　　要：在有效质量近似下详细推证了强均匀外电场作用下纳米管中电子的能量和波函数,在此基础上,得到光波辐照下电子的跃迁矩阵元.以CdS/HgS/CdS纳米管为例,讨论了线度和外电场对它的电子跃迁矩阵元的影响,结果表明:相同线度的纳米管在不同能带不同能级间的量子跃迁矩阵元,要比同能带不同能级的跃迁矩阵元约大1万倍;纳米管矩阵元均随电场增大而减小,电场较小时变化较快,而电场较大时变化较慢;在电场一定的情况下,纳米管矩阵元均随线度增大而增大.Using the effective mass approximation,the electronic energy and waves function of the semi-conductor nanotubes have detailedly been proved in strong and uniform external electric field,on this ba-sis,under the lightwave irradiation,the electronic transition matrix element have been obtained from the example of the CdS/HgS/CdS nanotubes,and the influences of external electric field and size on the elec-tronic transition matrix element of the semiconductor nanotubes been explored.The results show that,in the same size,the quantum transition matrix element between different energy levels in the different ener-gy bands are 10 000 times larger than that in the same energy band.The matrix element of the nanotubes all decrease with the increasing electric field,the decrease very faster when the electric field is weak,while the decrease very slower when the electric field is strong.The matrix element all increase with the increas-ing size when the electric field is kept constant.

关 键 词：半导体纳米管 量子跃迁矩阵元 电场 

分 类 号：O472.3[理学—半导体物理]