PHYSICS/BK21 SEMINAR[09.07.22]

"
  One-Dimensional Atomic and Molecular
      Wires on Semiconductor Surfaces
  
Ø ? Speaker : Prof. Jun-Hyung Cho [Hanyang University]  
Ø ? Place : Physics Seminar Room (Science Bldg, 3-201)
Ø ? Date & Time : July 22 (Wed), 16:00 ~ 17:00 pm

Abstract
  
  
Electrons confined in one-dimensional (1D) systems are strongly correlated among themselves, giving rise to a variety of
intriguing physical phenomena such as Peierls instability, Jahn-Teller distrortion, spin polarization, or non-Fermi-liquid
ground states. It is very challenging to understand such unique electronic properties in 1D systems, which are
fundamentally different from two- and three-dimensional cases.  In this talk,  I  will  present  our  recent
density-functional  theory  calculations  for  the  three  subjects:  (1)  the controversial issue on the driving forces of the
phase transition observed in quasi 1D indium chains on the Si(111) surface,  (2) quantum size effects in competing
charge and spin orderings of dangling-bond wires fabricated on an H-terminated Si(001) surface, and (3) several new
ideas for the formation of 1D molecular wires on the Si(001) surface.
  

    
             Contact Person : Prof. Myung-Ho Kang(054-279-2086,  Kang@postech.ac.kr)"