Speaker: Alexandra Carvalho
Affiliation: NUS Physics & GRC
Abstract Details: Black phosphorus has recently been brought into the limelight following the unveiling of the curious properties of its monolayer form, phosphorene. While most known 2D materials have hexagonal structures, resembling graphene, phosphorene has a curious waved-like structure that gives its properties an anisotropic 'twist'. In less than one year, the studies of black phosphorus and phosphorene have been multiplying, with exciting results. It has been shown to be a direct-gap or nearly-direct gap semiconductor both on monolayer and multi-layer form that can become an indirect-gap semiconductor, a semimetal or a metal application of uniaxial stress. Experiments in multi-layer material yield carrier mobilities of about 1000 cm2/(Vs). And recently, the isolation of the monolayer form has been announced. The list continues to grow as theoretical studies add high optical absorption, superconductivity, thermoelectricity... In this talk, I will consider what makes phosphorene so special. As the recent developments are reviewed, we will turn to density functional theory models for further insight into the electronic and optical properties of this material.Click HERE for directions

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