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Departmental Colloquium

Title
Nanoscopy of Anisotropic Black Phosphorous  
Guest Speaker
Prof. Y. Abate  
Guest Affiliation
Center for Nano-Optics (CeNO), Department of Physics and Astronomy, Georgia State University  
Host
Prof. David Landau  
When
Thursday, February 16, 2017 3:30 pm - 4:30 pm  
Location
Physics Auditorium (Rm 202)  
Details
Nanolayered and two-dimensional materials such as graphene, boron nitride, transition metal dichalcogenides, and black phosphorus have intriguing physical properties and bear promise of important applications. Of them, black phosphorus has unique electronic properties due to its anisotropic structure and highly tunable band gap both by number of monolayers and by surface doping. I will discuss our recent experimental investigation and theoretically interpretation of anisotropic near-field properties of a few-atomic monolayer nanoflakes of black phosphorus. We have discovered near-field patterns of outside bright fringes and high surface polarizability of nanofilm black phosphorus consistent with its surface-metallic behavior at mid-infrared frequencies. The major impediment to research and prospective application of single/few-layer black phosphorus is its chemical degradation under ambient conditions. I will present our experimental quantification of geometric properties and theoretical modeling of the chemical degradation process of black phosphorus as well as investigation of the effectiveness of passivation coatings using infrared nanoscopy.  

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