State vector evolution localized over the edges of a square tight-binding lattice

• 来源期刊: 中国物理B（英文版）
• 关键词: Anderson localization surface states state vector evolution
• 年，卷（期）: 2009,（3）
• 页码范围: 1214-1220
• 页数: 7页
• 语种: 英文

摘要

We study the time evolution of a state vector in a square tight-binding lattice, focusing on its evolution localized over the system surfaces. In this tight-binding lattice, the energy of atomic orbital centred at surface site is different from that at the interior (bulky) site by an energy shift U. It is shown that for the state vector initially localized on a surface, there exists an exponential law (y = aex/b + yo) determined by the absolute value of the energy shift, \U\, which describes the transition of the state evolving on the square tight-binding lattice, from delocalized over the whole lattice to localized over the surfaces.