AI 中文总结
研究弱掺杂闪锌矿半导体中光诱导带间相干的霍尔响应，推导八带凯恩模型下的边界动力学方程，发现窄隙半导体利于观测该效应，确立直流驱动克尔显微术为相关效应的直接探针。
AI 中文摘要
我们识别出一种由光诱导的带间相干而非非平衡带布居所携带的霍尔响应。在弱掺杂闪锌矿半导体中，纵向直流场驱动由近带隙光产生的导带-价带相干的横向通量。角平均消除了均匀相干密度，而横向边界将横向通量转化为反对称、局域于边缘、手性奇的极化。所得克尔信号既不需要自旋轨道耦合，也不需要单个带内的自旋、谷或轨道积累。在八带凯恩模型内，我们推导了边界动力学方程，并得到由光失谐和带间退相控制的复传播长度。边缘轮廓在光共振时单调，远离共振时发展出衰减的空间振荡。电子-空穴不对称性和强带间混合会增强该响应，使得窄隙半导体特别有利于观察该效应。这些结果确立了直流驱动的克尔显微术作为带间相干霍尔效应和实空间多带量子动力学的直接探针。
英文摘要
We identify a Hall response carried by optically induced interband coherence rather than by a non-equilibrium band population. In a weakly doped zinc-blende semiconductor, a longitudinal dc field drives a transverse flux of the conduction--valence coherence created by near-gap light. Angular averaging eliminates the homogeneous coherence density, while a lateral boundary converts the transverse flux into an antisymmetric, edge-localized, helicity-odd polarization. The resulting Kerr signal requires neither spin-orbit coupling nor a spin, valley, or orbital accumulation within an individual band. Within the eight-band Kane model, we derive the boundary kinetic equation and obtain a complex propagation length controlled by optical detuning and interband dephasing. The edge profile is monotonic at optical resonance and develops damped spatial oscillations away from it. The response is enhanced by electron--hole asymmetry and by strong interband mixing, making narrow-gap semiconductors especially favorable to observe the effect. These results establish dc-driven Kerr microscopy as a direct probe of an interband-coherence Hall effect and of multiband quantum kinetics in real space.
Comments8 pages, 4 figures
