Far-infrared emission and absorption by hot carriers in superlattices
Far-infrared emission and absorption by hot carriers in superlattices
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超晶格中热载流子的远红外发射和吸收
DOI：
10.1088/0268-1242/7/3b/001
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发表时间：
1992
影响因子：
1.9
通讯作者：
M. Leadbeater
中科院分区：
文献类型：
--
作者：
S. Allen;G. Brozak;E. Colas;F. Derosa;P. England;J. Harbison;M. Helm;L. Florez;M. Leadbeater
受半导体超晶格生长的刺激，一些最早的理论推测集中在基于通过工程能带结构的垂直输运的新型器件上;江崎和大津承诺在窄的迷你能带系统中使用布洛赫振荡器;卡扎里诺夫和苏里斯设想将电刺激子带间跃迁作为红外辐射源。近20年后，这些材料系统已经完善，特征和理解，实验正在出现，测试这些新的亚毫米波电子学的原始概念。作者描述了最近在量子威尔斯阱中用共振隧穿电流激发子带间发射的实验。目前的一个关键问题是设计一种实现人口反转的方法。其他实验探索了窄迷你带传输中的“饱和”效应。热饱和可以被看作是布洛赫振荡的前兆，如果相同的效果可以与施加的电场诱导。
Some of the earliest theoretical speculation, stimulated by the growth of semiconductor superlattices, focused on novel devices based on vertical transport through engineered band structures; Esaki and Tsu promised Bloch oscillators in narrow mini-band systems and Kazarinov and Suris contemplated electrically stimulated intersubband transitions as sources of infrared radiation. Nearly twenty years later these material systems have been perfected, characterized and understood and experiments are emerging that test some of these original concepts for novel submillimetre wave electronics. The authors describe recent experiments on intersubband emission in quantum wells stimulated by resonant tunnelling currents. A critical issue at this time is devising a way to achieve population inversion. Other experiments explore 'saturation' effects in narrow miniband transport. Thermal saturation may be viewed as a precursor to Bloch oscillation if the same effects can be induced with an applied electric field.