Magnetotransport in high quality 2D material heterostructures

报告题目：Magnetotransport in high quality 2D material heterostructures

报告人：王雷

报告地点：中1-3113

报告时间：6月17号(周五)上午10:00-12:00AM

Abstract：

Graphene is the most commonly-known two-dimensional (2D) material, just one atom thick, which can be exfoliated from a bulk piece graphite. And there exists a large class of van der Waals materials, ranging from insulator, semiconductor to metal and superconductor, in which single atomic layer can be peeled from the bulk. Assembling these different types of single layers of atoms with complementary properties into layered heterostructures presents many exciting opportunities. For example, encapsulating graphene with BN yields enhanced transport properties with reduced environmental sensitivity, and provides the capability for complex band structure engineering. This allows graphene to be exploited as a model experimental platform to study a wide range of fundamental physics arising both from conventional single-particle considerations, as well as more exotic emergent behaviour in the strongly interacting regime. In this talk I will discuss both fundamental science and technological applications that are being enabled by this new type of materials fabrication.

简历

王雷，Cornell University研究员，发表一作论文6篇，3篇Science，1篇Nature，1篇Nature Photonics，1篇ACS Nano，共发表论文30余篇，被引用4900次，作邀请报告13次。

Lei Wang is currently a KAVLI fellow at the Kavli institute at Cornell University for nanoscale science, where he is studying electrical and optical properties of 2D material heterostructures. In 2014, Lei earned his PhD in Electrical Engineering at Columbia University in the city of New York, where he developed the van der Waals transfer technique to make high quality encapsulated 2D material heterostructures. This work is widely regarded as a milestone in achieving high quality encapsulated graphene devices, reaching the theoretical limit. Since then, Lei’s work has revolutionized the entire 2D material device fabrication procedures, including 2D semiconductors, MoS₂, WeSe₂… superconductors, NbSe₂, and air-sensitive materials, black phosphorene, for better device quality. In Lei’s postdoctoral period, he has studied the electron interaction physics in these high quality devices, including tunable fractional quantum Hall effect in bilayer graphene and the observation of a new type of fractional quantum Hall effect in the Hofstadter spectrum. Previously he earned Master’s and Bachelor (first class honors) degree in Electrical Engineering at National University of Singapore.