Thursday, May 7, 2009, Condensed Matter Biological Physics Seminar, Young Kuk, Dept. of Physics and Astronomy, Seoul National University, Korea and NIST, "Geometric and Electronic Structure in One Dimensional Nanosystems", 4:30 PM, 7316 Wean Hall, CMU (*Note special location)
 

Abstract:

In most of passive and active devices, charge carriers flow through the middle of a bulk wire or sometimes near its surfaces/interfaces. In a one-dimensional nanodevice, the transport property may be quite different from bulk devices. We have studied model one-dimensional devices, such as carbon nanotubes, Si nanowires and graphene. We have tried to understand the geometric and electronic structures or the transport properties of these nanowires using scanning tunneling microscope (STM), atomic force microscope (AFM), scanning Kelvin probe microscopy, electrostatic force microscopy (EFM) and scanning gate microscopes (SGM). We have begun to learn much new physics, such as 1) different screening behavior in 1-D, 2) deviation from a Fermi liquid, 3) different defect bands from the 3-D counter parts, and 4) size effects in superconducting nanodots.