State vector evolution localized over the edges of a square tight-binding lattice
He Liang-Ming(何良明)a) and Shi Duan-Wen (石端文)b)
a College of Physics and Electronic Engineering, Guangxi University for Nationalities, Nanning 530006, China; b Department of Physics, Hainan Normal University, Haikou 571158, China
Abstract 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+y0) 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.
Received: 05 July 2008
Revised: 10 September 2008
Accepted manuscript online:
PACS:
73.20.At
(Surface states, band structure, electron density of states)
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