[물리학과] 세미나 공지(Title: Twisting and Stretching van der Waals Bilayers: an Atomic-Scale view)
조회 : 156
-일시: 4월 26일 금요일 오후 5시
-장소: B 108
-연사: Prof. Abhay Pasupathy
Department of Physics, Columbia University
-제목: Twisting and Stretching van der Waals Bilayers: an Atomic-Scale view
With the magic of scotch tape, it has now become possible to create artificial layered materials with unique electronic properties. An example of this is a twisted bilayer, where two single layer sheet of a layered material can be stacked together to create a bilayer, but with a controllable twist between the layers. Such structure have new single-electron and many body properties that each of the individual layers may not exhibit. I will discuss two such materials in this talk. The firs of these is twisted bilayer graphene, a material which display interesting new electronic phase including insulating behavior, superconductivity, and magnetism. I will discuss scanning tunneling microscopy measurements of this material from my laboratory where we can visualize the atomic structure and measure the excitations of this unique material. The second material I will discuss is heterostrained transition metal dichalcogenides. I will show that strain applied to one layer relative to the other can create new atomic structures termed “strain solitons”. I will discuss the formation, manipulation and electronic properties of these solitons.