Anomalous indirect carrier relaxation in direct band gap atomically thin gallium telluride
PHYSICAL REVIEW B(2023)
Abstract
We report ultrafast studies on atomically thin Gallium telluride, a 2D metal monochalcogenide that has appeared to display superior photodetection properties in visible frequencies. Pump photon energy-dependent spectroscopic studies reveal that photoinduced carriers in this direct band-gap material undergo indirect relax-ation within similar to 30 ps of photoexcitation, which is at least an order slower than that of most 2D materials. Despite the direct band-gap nature, slow and indirect carrier relaxation places this layered material as a prime candidate in the multitude of atomically thin semiconductor-based photodetectors and highlights the potential for prospective optoelectronic applications.
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Key words
anomalous indirect carrier relaxation,gallium,indirect band gap,telluride
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