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The temperature dependence of the band gap is crucial to a semiconductor.Bulk black phosphorus (BP) is known to exhibit an anomalous behavior. Throughoptical spectroscopy, here we show that the temperature effect on BP band gapgradually evolves with decreasing layer number, eventually turns into a normalone in the monolayer limit, rendering a crossover from the anomalous to thenormal. Meanwhile, the temperature-induced shift in optical resonance alsodiffers with different transition indices for the same thickness sample. Acomprehensive analysis reveals that the temperature-tunable interlayer couplingis responsible for the observed diverse scenario. Our study provides a key tothe apprehension of the anomalous temperature behavior in certain layeredsemiconductors.

From Anomalous to Normal: Temperature Dependence of the Band Gap in Two-Dimensional Black Phosphorus