| 查看: 3689 | 回复: 4 | ||||
| 当前主题已经存档。 | ||||
fenxiangwxh木虫 (小有名气)
|
[交流]
什么是激子波尔半径
|
|||
| 请问大家什么是激子波尔半径，最好能解释的通俗一些 |
回复此楼» 收录本帖的淘帖专辑推荐
 纳米材料 |
» 猜你喜欢
求助:我三月中下旬出站，青基依托单位怎么办？
已经有9人回复
-
Cas 72-43-5需要30g，定制合成，能接单的留言
已经有8人回复
-
北京211副教授，35岁，想重新出发，去国外做博后，怎么样？
已经有8人回复
-
磺酰氟产物，毕不了业了！
已经有5人回复
-
论文终于录用啦！满足毕业条件了
已经有25人回复
-
2026年机械制造与材料应用国际会议 （ICMMMA 2026）
已经有3人回复
-
自荐读博
已经有3人回复
-
不自信的我
已经有5人回复
-
投稿Elsevier的杂志（返修），总是在选择OA和subscription界面被踢皮球
已经有8人回复
2楼2009-06-03 21:59:09
victor3828
金虫 (职业作家)
- 应助: 0 (幼儿园)
- 金币: 1289.7
- 散金: 27
- 红花: 5
- 帖子: 4821
- 在线: 177.8小时
- 虫号: 737598
- 注册: 2009-04-01
- 性别: MM
- 专业: 一般管理理论与研究方法论
3楼2009-06-04 00:11:19
★ ★
fenxiangwxh(金币+2,VIP+0): 6-4 09:26
fenxiangwxh(金币+2,VIP+0): 6-4 09:26
|
It's a vital concept in quantum dots. Hope this description would be helpful: Exciton不用多说了，就是电子空穴对。 Exciton Bohr radius is the natural physical separation in a crystal between an electron in the conduction band and the hole it leaves behind in the valence band. The size of this radius controls how large a crystal must be before its energy bands can be treated as continuous. Therefore, the Exciton Bohr Radius can rightly be said to define whether a crystal can be called a semiconductor quantum dot, or simply a bulk semiconductor. (一般的QD的玻尔激子半径大概几个纳米，比如CdSe:4.9 nm; CdS: 2.8 nm.) In a large semiconductor crystal, the Exciton Bohr Radius is small compared to the crystal, and the exciton is free to wander throughout the crystal. In a quantum dot, the Exciton Bohr Radius is on the order of the physical dimension of the dot or smaller, and the exciton is confined. This second set of conditions is called quantum confinement, which is synonymous with having discrete, rather than continuous energy levels. 注: 玻尔半径是以氢原子为模型提出的，因为外层只有一个电子，玻尔半径就定义为从原子核到外面那个电子可以运行的轨道的距离。QD中激子玻尔半径是根据这个引申出来的。 [ Last edited by ekin007 on 2009-6-4 at 03:38 ] |
4楼2009-06-04 03:28:03
5楼2009-06-04 07:31:27