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Dr. Philip Kim 

Harvard University, Cambridge, MA.

November 14th, 2016, 3:15PM,  
Thirkield Hall (Physics), room 103

 
Materials in 2-dimension and beyond: platform for novel electronics and optoelectronics  [PDF]

ABSTRACT:  Heterogeneous interfaces between two dissimilar materials   are an essential building block for modern semiconductor devices. The  2­‐dimensional (2D) van der Waals (vdW) materials and their heterostructures   provide   a   new   opportunity   to   realize   atomically   sharp  interfaces in the ultimate quantum limit for the electronic and  optoelectronic processes. By assembling atomic layers of vdW materials,  such as hexa boronitride, transition metal chalcogenide and graphene,  we can construct atomically thin novel quantum structures. Unlike  conventional semiconductor heterostructures, charge transport in of the  devices   is   found   to   critically   depend   on   the   interlayer   charge   transport,  electron­‐hole recombination process mediated by tunneling across the  interface. We demonstrate the enhanced electronic optoelectronic  performances in the vdW heterostructures, tuned by applying gate  voltages,   suggesting   that   these   a   few   atom   thick   interfaces   may   provide   a  fundamental platform to realize novel physical phenomena. In this  presentation, we will discuss several recent development of electronic  and optoelectronic properties discovered in the van der Waals  heterostructures, including hydrodynamic charge flows, cross-­‐Andreev  reflection across the quantum Hall edges states, and interlayer exciton  formation   and   manipulations.