Journal of the Korean Physical Society

pISSN 0374-4884 eISSN 1976-8524


J. Korean Phys. Soc. 2020; 76(8): 710-714

Published online April 29, 2020

Copyright © The Korean Physical Society.

Metallic Phases on a Pristine Si(111) Surface

Kangmo Yeo, Sukmin Jeong

Department of Physics and Research Institute of Physics and Chemistry, Jeonbuk National University, Jeonju 54896, Korea

Correspondence to:Sukmin Jeong


We propose new pristine Si(111) surfaces with nearly flat and metallic property, based on first-principles calculations. The surfaces are composed of connected armchair ribbons, in which the constituent Si atoms are threefold  (DB) or fourfold (DH) coordinated (Left panel). The calculated electronic structures show that the surfaces are metallic, as in topological insulators, in which the insulating bulk is surrounded by metallic surfaces (Right panel). Their unique structural and electronic properties are worthy of note to investigate and are expected to open a new realm of semiconductor materials if they are realized experimentally.

Keywords: Silicon surface, Metallic surface, Si, DFT