论文标题
放松对光伏效应的影响和透明区域内光电流的可能性
Effects of relaxation on photovoltaic effect and possibility of photocurrent within transparent region
论文作者
论文摘要
从理论上讲，我们在金属中研究了光电流，这些光电流都破坏了两个反演$ \ mathcal {p} $和$ \ Mathcal {t} $ symmetries透明区域内的光电。我们发现，AC电场下的系统有效地描述了有效的哈密顿量，并且如果诱导当前$ω_j$的频率和散射率$γ$γ$γ$满足$ω_j/γ/γ\ ll 1 $ $ limit and limit of limit of limit of limit of limit of limit of limit of limit of limit of limit of limit和van o的量，则光电流的顺序为$ \ MATHCAL {O}（OCH_JJ/γ）$。另一方面，有效的汉密尔顿描述表明，如果系统足够薄，则与诱导电流方向的平均自由路径相比，即使在透明区域中，也可以出现非变化的光电流。透明区域内此类光伏效应的候选材料包括多效性破坏$ \ MATHCAL {P} $和$ \ MATHCAL {T} $ symmetries。
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 $\mathcal{O}(ω_J/γ)$ if the frequency of the induced current $ω_J$ and the scattering rate $γ$ satisfy $ω_J/γ\ll 1$, and vanishes in the limit of $ω_J/γ\to 0$. 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 $γ$ 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.
