Prof. Harold J. W. Zandvliet
Unversity of Twente, Netherlands
Abstract：Scanning tunneling microscopy is the ideal technique to explore the structural and electronic properties of low-dimensional electron system. In this talk I will address 1D as well as 2D systems. I will briefly address our work on Pt, Au and Iratom chains on Ge(001) surfaces, germanene and single molecule devices (single molecule switch and transistor). Subsequently, I will discuss an ultra-small nano-electromechanical device. In his seminal lecture “There is plenty of room at the bottom” Richard Feynman envisaged that once man will be able to build devices and machines that only consist of a handful of atoms. Now, about five decades after his visionary talk, Feynman’s vision has become reality. I will show the feasibility of controlling an atomic scale mechanical device by an external electrical signal. The nanomachine is comprised of four atoms and exhibits a rich dynamic behaviour. The switching motion of the nanomachine is governed by electrons that are directly injected into the atoms with a Scanning Tunnelling Microscope tip. By precisely controlling the tip current and distance we make two atom pairs behave like the flippers of an atomic sized pinball machine. The nanomachine can be switched on/off and its flipping frequency can be accurately adjusted.
Venue: 催化基础国家重点实验室三楼会议室
Time: 9:00-10:00
Date: Jan. 29, 2015