Coherence control of directional nonlinear photocurrent in spatially symmetric systems,Physical Review B

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Coherence control of directional nonlinear photocurrent in spatially symmetric systems
Physical Review B ( IF 3.2 ) Pub Date : 2021-10-25 , DOI: 10.1103/physrevb.104.155146
Yongliang Shi ₁ , Jian Zhou ₂

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The interplay between crystal symmetry and its optical responses is at the heart of tremendous recent advances in light-matter interactions and applications. Nonlinear optical processes that produce electric currents, for example the bulk photovoltaic (BPV) effect, require inversion-symmetry-broken materials, such as ferroelectrics. In this work, we demonstrate that such BPV current could be generated in centrosymmetric materials with excitation of out-of-equilibrium coherent phonons. This is very different from the generally studied static or thermally excited states. We show that depending on the coherent phonon phase factor, the photoconductivity contains a static zero-frequency component, as well as THz frequency components. This indicates that a unidirectional current may emerge under synergistic effects of atomic vibration and light irradiation. We also generalize the conventional injection charge current into angular momentum (spin and orbital) degrees of freedom, and demonstrate spin and orbital BPV photoconductivities under coherent phonons. Our findings open the pathway to exploring the exotic phonon-photon-electron coherent interactions in quantum materials.

中文翻译：

空间对称系统中定向非线性光电流的相干控制

晶体对称性与其光学响应之间的相互作用是最近光-物质相互作用和应用取得巨大进展的核心。产生电流的非线性光学过程，例如体光伏 (BPV) 效应，需要反转对称性破坏的材料，例如铁电体。在这项工作中，我们证明了这种 BPV 电流可以在中心对称材料中产生，并激发失衡相干声子。这与通常研究的静态或热激发态非常不同。我们表明，根据相干声子相位因子，光电导包含静态零频率分量以及太赫兹频率分量。这表明在原子振动和光照射的协同作用下可能会出现单向电流。我们还将传统的注入电荷电流推广到角动量（自旋和轨道）自由度，并证明了相干声子下的自旋和轨道 BPV 光电导率。我们的发现为探索量子材料中奇异的声子-光子-电子相干相互作用开辟了道路。

更新日期：2021-10-26

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