ISSP - The institute for Solid State Physics

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[ISSP Colloquiums]
Atomic Wires on Surfaces - metal-insulating transitions and electron correlation
Title : Atomic Wires on Surfaces - metal-insulating transitions and electron correlation
Date :
Time :
2008/8/26(Tue)
1:30 PM -  
Place : Lecture Room (A632), 6th Floor, ISSP   
Lecturer : Prof. Han Woong Yeom
Affiliation : Institute of Physics and Applied Physics, Yonsei University
Summary : During last ten years, we have studied the electronic structures of metallic atomic wire arrays self-assembled on silicon surfaces [1-8]. The motivations are twofold; (i) these systems might be exploited in future nano- or molecular-scale device architectures and (ii) they may be useful as a new class of model systems for the investigation of physics of low dimensional electrons. The systems investigated are 4x1-In [1-3], 5x2-Au [4, 5] reconstructions on flat Si(111) and Au-induced 1D structures on vicinal Si(111) such as Si(553), Si(557), and Si(5 5 12) [6, 7]. These systems feature well-defined 1D electron bands with partial fillings and Peierls-type metal-insulator transitions by strong electron-lattice interactions [1-3, 6, 7]. The importance of defects was also noticed and the controllable defect could be used to tune the electronic bands systematically [4, 5]. Very recently, we also found the signatures of electron correlation, which leads to the non Fermi liquid behaviors as expected for 1D metal [8, 9].
Contact : Iwao Matsuda (ext.63402)