Mott光伏系统中的声子效应、碰撞电离与功率转换
Phonon effects, impact ionization and power conversion in Mott photovoltaic systems
AI总结：
本研究针对Mott绝缘层光伏装置，结合Migdal近似与实空间Floquet动力学平均场理论，分析声学声子对光电流等的影响，明确碰撞电离对输出功率的提升作用及电子-声子相互作用的抑制效应。
摘要：
我们分析了声学声子对一种简化光伏装置的光电流和光谱特性的影响，该装置由两个金属电极之间的Mott绝缘层构成，电极间施加偏置电压。我们通过Migdal近似（米格尔近似）引入声学声子，并采用实空间Floquet动力学平均场理论处理非平衡Floquet稳态，使用辅助主方程方法作为杂质求解器。研究发现，在低偏置电压下，声学声子的耗散对碰撞电离的影响较弱；而在较高偏压下，Hartree位移会显著改变Hubbard带的在位能，并在中等电子-声子耦合强度下抑制光电流。碰撞电离过程对提升电输出功率起关键作用，当考虑电子-声子相互作用时，电输出功率会下降。
英文摘要：
We analyze the effect of acoustic phonons on the photocurrent and the spectral characteristics of a simplified photovoltaic setup made of Mott insulating layers between two metallic leads among which a bias voltage is applied. We include acoustic phonons via the Migdal approximation and we use real-space Floquet dynamical mean-field theory to address the nonequilibrium Floquet steady-state. The so-called auxiliary master equation approach is employed as impurity solver. We find that impact ionization is only weakly affected by dissipation by acoustic phonons at low bias voltages. For higher biases instead, the Hartree shift considerably alters the on-site energies of the Hubbard bands and suppresses the photocurrent for intermediate electron-phonon coupling strengths. Impact ionization processes play a fundamental role in enhancing the electrical output power, which decreases when electron-phonon interaction is considered.
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