论文标题
在半导体的相干二维光电流激发光谱中识别不相干的混合效应
Identifying incoherent mixing effects in the coherent two-dimensional photocurrent excitation spectra of semiconductors
论文作者
论文摘要
我们先前已经证明，在二维（2D）一致的电子光谱中，通过相调节和相位敏感的检测测量，由于通过线性激发途径产生的光激发产生的光激发导致的\ Emph {Incherent}非线性响应，导致了指标信号的意外信号，因为意外的背景是意外的背景。 \ textbf {147}，114201（2017）]。在这里，我们通过外部作用于用于相位敏感检测的跨阻止放大器电路，模拟从GAAS太阳能电池收集的光电流信号中这种不相互分的种群混合的影响，我们确定了一种有效的策略，以识别2D数据中存在不相互分种群混合的存在。虽然我们发现在四脉冲激发序列中的两个时间延迟变量处的线性振幅之间的串扰反映了不一致的混合，但正如简单系统的建模所预期的那样。
We have previously demonstrated that in the context of two-dimensional (2D) coherent electronic spectroscopy measured by phase modulation and phase-sensitive detection, an \emph{incoherent} nonlinear response, due to pairs of photoexcitations produced via linear excitation pathways, contribute to the measured signal as unexpected background [Grégoire et al., J.\ Chem.\ Phys. \textbf{147}, 114201 (2017)]. Here, we simulate the effect of such incoherent population mixing in the photocurrent signal collected from a GaAs solar cell by acting externally on the transimpedance amplifier circuit used for phase-sensitive detection, and we identify an effective strategy to recognize the presence of incoherent population mixing in 2D data. While we find that incoherent mixing is reflected by cross-talk between the linear amplitude at the two time-delay variables in the four-pulse excitation sequence, we do not observe any strict phase correlations between the coherent and incoherent contributions, as expected from modelling of a simple system.
