Direct observation of the layer-dependent electronic structure in phosphorene
ORAL
Abstract
Phosphorene, a single atomic layer of black phosphorus, has recently emerged as a new two-dimensional (2D) material that holds promise for electronic and photonic technology. Here we experimentally demonstrate that the electronic structure of few-layer phosphorene varies significantly with number of layers, in good agreement with theoretical predictions. The interband optical transitions cover a wide, technologically important spectrum range from visible to mid-infrared. In addition, few-layer phosphorene is observed to photoluminesce at energies that correlate well with the layer-dependent bandgap transitions. The strongly layer-dependent electronic structure of phosphorene, in combination with its high electrical mobility, gives it distinct advantages over other two-dimensional materials in electronic and opto-electronic applications.
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