弹道热注入对等离子体吸收的长寿命调制
Long-lived modulation of plasmonic absorption by ballistic thermal injection
摘要：
跨金属-半导体界面的能量和电荷转移是广泛应用的基本驱动力，例如计算、能量收集和光电探测。然而，这两种现象的确切作用和物理分离仍然不清楚，特别是在等离子体激发系统或强非平衡的情况下。我们报告了一系列的超快等离子体激元测量，提供了一个直接测量的电子分布，在空间和时间上，以下的金属-半导体异质结构的光激发。这是第一次，我们明确表明，在强非平衡的情况下，一种新的能量转换机制出现在金属/半导体界面。我们发现，在金属接触的热电子转移其能量的半导体中预先存在的电子，没有转移电荷。这些实验结果得到了严格的多层膜光学模型和第一性原理从头计算的支持。
英文摘要：
Energy and charge transfer across metal-semiconductor interfaces are the fundamental driving forces for a broad range of applications, such as computing, energy harvesting, and photodetection. However, the exact roles and physical separation of these two phenomena remains unclear, particularly in plasmonically-excited systems or cases of strong nonequilibrium. We report on a series of ultrafast plasmonic measurements that provide a direct measure of electronic distributions, both spatially and temporally, following optical excitation of a metal-semiconductor heterostructure. For the first time, we explicitly show that in cases of strong non-equilibrium, a novel energy transduction mechanism arises at the metal/semiconductor interface. We find that hot electrons in the metal contact transfer their energy to pre-existing electrons in the semiconductor, without transfer of charge. These experimental results findings are well-supported by both rigorous multilayer optical modeling and first-principle, ab initio calculations.
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