混合光子计数探测器双选通模式在测量GaAs/AlAs超晶格结构瞬态热传导中的应用
Implication of the double-gating mode in hybrid photon counting detector for measurements of transient heat conduction in GaAs/AlAs superlattice structures
摘要：
理解和控制纳米尺度下固体中的热输运对于设计和增强新一代光电、热电和光子器件的性能至关重要。在这方面，半导体超晶格结构提供了一个独特的平台来研究与固体中的声子传播相关的现象，如热传导。瞬态X射线衍射可以直接探测原子运动，因此是对凝聚态物质中声子动力学敏感的罕见技术之一。本文利用EIGER 2探测器研究了GaAs/AlAs超晶格结构中的光诱导瞬态热传导。基准实验已在奥地利SAXS光束线在Elettra Sincrotrone的里雅斯特，在混合填充模式下运行。我们表明，漂移的实验条件，如同步辐射光束的波动，变得不那么重要时，利用EIGER 2双门模式，导致更快地获得高质量的数据，并有利于数据分析和数据解释。
英文摘要：
Understanding and control of thermal transport in solids at nanoscale is crucial to engineer and to enhance properties of a new generation of optoelectronic, thermoelectric, and photonic devices. In this regard, semiconductor superlattice structures provide a unique platform to study phenomena associated with phonon propagations in solids such as heat conduction. Transient X-ray diffraction can directly probe atomic motions and therefore is among the rare techniques sensitive to phonon dynamics in a condensed matter. Here, we study optically induced transient heat conduction in GaAs/AlAs superlattice structures using EIGER2 detector. Benchmark experiments have been performed at the Austrian SAXS beamline at Elettra Sincrotrone Trieste that operated in the hybrid filling mode. We demonstrate that drifts of experimental conditions, such as synchrotron beam fluctuations, become less essential when utilizing EIGER2 double gating mode that results in a faster acquisition of high quality data and facilitates data analysis and data interpretation.
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