Dispersive terahertz gain of non-classical oscillator: Bloch oscillation in semiconductor superlattices
Dispersive terahertz gain of non-classical oscillator: Bloch oscillation in semiconductor superlattices
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DOI：
10.1103/physrevlett.94.057408
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发表时间：
2005-02
期刊：
影响因子：
--
通讯作者：
K. Hirakawa
中科院分区：
文献类型：
--
作者：
K. Hirakawa
这项研究表明，布洛赫振荡器有一个本质上不同的性质，从半经典带电谐振子，它确实是可能的，以提取净增益从布洛赫振荡在半导体超晶格。利用自由空间THz电光采样方法，直接确定了Bloch振荡电子复电导率的谱形，证实了动态电导率的真实的部分在低于Bloch频率时变为负值
This study demonstrates that Bloch oscillators have an essentially different nature from that of semi-classical charged harmonic oscillators and that it is indeed possible to extract a net gain from Bloch oscillations in semiconductor superlattices. By free-space THz electro-optic sampling method, this work has directly determined the spectral shape of the complex conductivities of Bloch oscillating electrons and has confirmed that the real part of the dynamical conductivity goes negative below the Bloch frequency