Two-dimensional (2D) van der Waals materials, including graphene and hexagonal boron nitride (hBN), have great potential for realizing atomically thin advanced optoelectronics devices due to their extraordinary physical properties. Associate Prof. Young Duck Kim will talk about the graphene light emitter that exhibits bright visible light emission, which is possible due to the efficient hot electrons generation and localization in graphene under a high electric field. Furthermore, hBN-encapsulated graphene light emitters exhibit ultrafast light modulation up to ~ 10 GHz with a broad spectral range and thermal radiation spectrum modulations due to the strong light-matter interaction and efficient direct electronic cooling via near-field coupling of hybrid plasmon-phonon polaritonic modes.

Associate Prof.Young Duck Kim will also present the deep UV (210~400nm) electroluminescence (EL) from 2D ultrawide-bandgap material, hBN (> 6.4 eV). Recently, atomic-point defects in 2D hBN, so-called color centers in hBN, emerged as promising critical quantum materials for room temperature quantum information technologies and quantum nanophotonics. It will show the manipulation of carbon color centers in hBN, which can be created and manipulated by the in-situ local electric field in hBN heterostructures. These demonstrations will pave the way for developing hBN-based deterministic quantum emitters and quantum-integrated photonics. ​

Biography

Young Duck Kim is an Associated Professor of the Department of Physics at Kyung Hee University since 2017. Associate Prof. Kim received a B.S. at Yonsei University and Ph. D. at Seoul National University. He worked at Columbia University as a Postdoctoral research scientist for quantum transport and optoelectronics in van der Waals heterostructures. He discovered the bright visible light emission from graphene and is the holder of the Guinness world record for “The thinnest light source”. Recently, Associate Prof. Kim focuses on graphene and hexagonal boron nitride van der Waals heterostructure based light source, quantum emitter, valleytronics for optical communications and quantum transport in van der Waals heterostructures.