title: Dynamic ad-dimer twisting assisted nanowire self-assembly on Si(001).
abstract: Based on ab initio total energy calculation, we show that a dynamic ad-dimer twisting assisted (DATA) process plays a crucial role in facilitating a novel structural reconstruction involving surface and subsurface atoms on Si(001). It leads to self-assembly of long nanowires of group-V elements (Bi, Sb) in the trenches of surface dimer vacancy lines (DVLs) with a characteristic double-dimer configuration. The key to this is the lowering of the kinetic barrier by the DATA process in conjunction with a favorable interaction between ad-dimers and step edges in DVLs. The present results provide an excellent account for experimental observations and reveal the atomistic origin and the dynamic transformation path for nanowire self-assembly on Si(001).
authors.affiliation: Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China. wjt@aphy.iphy.ac.cn
authors.forename: Jian-Tao
authors.initials: JT
authors.lastname: Wang
authors.forename: E G
authors.initials: EG
authors.lastname: Wang
authors.forename: D S
authors.initials: DS
authors.lastname: Wang
authors.forename: H
authors.initials: H
authors.lastname: Mizuseki
authors.forename: Y
authors.initials: Y
authors.lastname: Kawazoe
authors.forename: M
authors.initials: M
authors.lastname: Naitoh
authors.forename: S
authors.initials: S
authors.lastname: Nishigaki