Effects of relaxation on the photovoltaic effect and possibility for photocurrent within the transparent region
Effects of relaxation on the photovoltaic effect and possibility for photocurrent within the transparent region
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DOI：
10.1103/physrevb.106.235110
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发表时间：
2022-04
影响因子：
3.7
通讯作者：
Y. Onishi;H. Watanabe;T. Morimoto;N. Nagaosa
中科院分区：
文献类型：
--
作者：
Y. Onishi;H. Watanabe;T. Morimoto;N. Nagaosa
我们从理论上研究了金属中的光电流，它打破了透明区域内的反转和数学对称性。我们发现，在交流电场作用下，系统可以用一个有效的哈密顿量来描述，如果感应电流的频率和散射率满足ω_J/伽马，系统的光电流为数学量{O}(欧米伽_J/伽马)的数量级，并且在欧米伽_J/伽马的极限范围内为零。另一方面，有效的哈密顿描述表明，如果与感应电流方向的平均自由程相比，系统足够薄，则即使在透明区域也可以出现非零光电流(其中，可以有效地将$\γ视为0)。在透明区域内产生这种光伏效应的候选材料包括同时破坏数学{P}和数学{T}对称性的多铁性。
We theoretically study photocurrents in metals that break both inversion $\mathcal{P}$ and $\mathcal{T}$ symmetries within the transparent region. We find that the system under the ac electric fields is well described with an effective Hamiltonian and the photocurrent is of the order of $\mathcal{O}(\omega_J/\gamma)$ if the frequency of the induced current $\omega_J$ and the scattering rate $\gamma$ satisfy $\omega_J/\gamma \ll 1$, and vanishes in the limit of $\omega_J/\gamma\to 0$. On the other hand, the effective Hamiltonian description indicates that nonvanishing photocurrent can appear even in the transparent region if the system is thin enough compared to the mean free path in the direction of the induced current (where $\gamma$ can be effectively regarded as 0). Candidate materials for the such photovoltaic effect within the transparent region include multiferroics breaking both $\mathcal{P}$ and $\mathcal{T}$ symmetries.