Decay and double-decay properties of edge bands of phosphorene ribbons
M. Yang, H.-J. Duan, R.-Q. Wang
Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials,
School of Physics and Telecommunication Engineering,
South China Normal University, 510006 Guangzhou, China
Abstract
Phosphorene (a mono-layer of black phosphorus) recently spurred much
attention due to its potential for application. We notice there are two types
of zigzag edge and also two types of armchair edge for phosphorene lattice.
We study the winding number of various types of edge of phosphorene ribbons
and conclude that, besides on the typical zigzag edge, the flat zero-energy
edge band can be found in the ribbon of another nontypical armchair edge. The
localization of these edge bands is investigated analytically. We find every
single edge state of the nontypical armchair edge decays to the bulk at two
different decay rates.