Model of the influence of an external magnetic field on the gain of terahertz radiation from semiconductor superlattices.
Model of the influence of an external magnetic field on the gain of terahertz radiation from semiconductor superlattices.
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DOI：
10.1103/physrevlett.103.117401
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发表时间：
2009-06
影响因子：
8.6
通讯作者：
T. Hyart;Jussi Mattas;K. Alekseev
中科院分区：
文献类型：
--
作者：
T. Hyart;Jussi Mattas;K. Alekseev
从理论上分析了磁场对超晶格小信号吸收和增益的影响。我们预测了一个非常大的和可调的太赫兹增益，由于在交叉电场和磁场的非线性回旋振荡。与布洛赫增益相反，这里的超晶格处于电稳定状态。我们还发现，太赫兹布洛赫增益可以显着增强与垂直磁场。如果磁场相对于超晶格轴倾斜，通常不稳定的布洛赫增益分布在斯塔克回旋共振附近变得稳定。
We theoretically analyze the influence of magnetic field on small-signal absorption and gain in a superlattice. We predict a very large and tunable THz gain due to nonlinear cyclotron oscillations in crossed electric and magnetic fields. In contrast to Bloch gain, here the superlattice is in an electrically stable state. We also find that THz Bloch gain can be significantly enhanced with a perpendicular magnetic field. If the magnetic field is tilted with respect to the superlattice axis, the usually unstable Bloch gain profile becomes stable in the vicinity of Stark-cyclotron resonances.