论文标题
Terahertz中的四极光伏效应在二维自旋-3/2孔系统中
Quadrupolar photovoltaic effect in the terahertz range in a two-dimensional spin-3/2 hole system
论文作者
论文摘要
由于量子孔中T_D对称性启用的重孔和轻孔子带之间的非线性光孔子带之间的非线性光学转变，我们确定了强烈的光伏响应，我们将其称为四极光伏效应（QPE）。光伏电流在重孔孔分裂的附近表现出很强的共振，受动量松弛时间的影响，可以在GAAS孔中达到纳米秒。由于可以将重孔孔拆分从几块MEV调整为近100 meV，因此QPE可以作为Terahertz photo-detector的基础。我们讨论实验观察和设备应用的策略。
We identify a strong photovoltaic response due to the non-linear optical transition between heavy and light hole sub-bands enabled by T_d-symmetry in a quantum well, which we term the quadrupolar photovoltaic effect (QPE). The photovoltaic current exhibits a strong resonance in the vicinity of the heavy hole-light hole splitting, with a magnitude governed by the momentum relaxation time, which can reach nanoseconds in GaAs holes. Since the heavy hole-light hole splitting can be tuned from a few meV to nearly 100 meV the QPE could serve as the basis for a terahertz photo-detector. We discuss strategies for experimental observation and device applications.
