Two-dimensional van der Waals heterostructuresfor quantum transports and ultrafast optoelectronics
- Speaker: Prof. Young Duck Kim (Ajou University)
- Date: Wednesday, January 24, 2018, at 17:00
- Place: Jungho Seminar
Two-dimensional (2D) van der Waals materials including graphene, hexagonal boron nitride and transition metal dichalcogenides (TMDCs) such as MoS2, WSe2, NbSe2, and 1T-TaS2 have great potential for exploring the exotic quantum behaviors and realization of advanced optoelectronic devices. However, nature of 2D materials, extremely sensitive to extrinsic effects, hampered efforts to observe its intrinsic transport. Recently developed ‘van der Waals heterostructure device platform’ allows the atomically perfect interface, dramatic suppression of extrinsic scattering effects, resulting in the achievements of dramatic improvements in performance with long-term stability. Especially, the hBN-encapsulation structure of TMDCs with multi-terminal graphene electrodes enables the observation of intrinsic transports such as quantum oscillations, coupled spin-valley physics as well as offer an entirely new opportunity for exploring the emerging 2D superconductivity and charge density wave. I will also talk about the van der Waals material based ultrafast optoelectronics. Especially, the 2D material based light source will be a critical component in the development of the high bandwidth on-chip optical interconnects and quantum information processing.