Self-generated Bloch oscillations in biased semiconductor superlattices

被引：2
|
作者：
Yang, LJ [1 ]
Dignam, MM [1 ]
机构：
[1] Queens Univ, Dept Phys, Kingston, ON K7L 3N6, Canada
来源：
PHYSICAL REVIEW B | 2006年 / 73卷 / 07期
关键词：
D O I：
10.1103/PhysRevB.73.075319
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We present theoretical simulations of the highly nonlinear ultrafast intraband response of photoexcited biased semiconductor superlattices. Usually, when Bloch oscillating wave packets are created in superlattices, the required coherences arise purely from a spectrally broad external optical pulse that couples different Wannier-Stark ladder states. However, we show that if the pulse intensity is high enough, then even if the optical pulse is spectrally much narrower than the Wannier-Stark ladder spacing, Bloch oscillating wave packets will be generated by the ultrafast nonadiabatic change in the self-generated internal dc electric field that arises from the formation of excitons with permanent dipole moments.
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页数：8
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