VietNam 2013 

IXth Rencontres du Vietnam
Quy-Nhon, August 4-10, 2013


 Nanophysics: from fundamentals to applications

(the return)


Thursday 8
Topological Insulators

› 14:20 - 14:40 (20min)
Dynamical Band-Engineering of Spin-Polarized Edge States
Binhe Wu  1@  
1 : Department of Applied Physics, Donghua University  (DHU)  -  Website
2999 North Renmin Road, 201620, Shanghai, China -  China

The band structure and electronic properties of materials can be engineered by dynamical methods. We investigate the electronic and transport properties of a normal insulator in form of a zigzag ribbon based on the Kane-Mele model subjected to circularly polarized radiation. Our results show that chiral edge-states can be induced in the band gap of the quasi-energy spectra under periodic driving. More interestingly, for appropriate parameters, there exists a single chiral edge state at each boundary of the sample. As a result, the conductance shows plateau structure with the step height e2/h as we increase the ac field intensity. These observations may find their potential applications for high-efficiency non-magnetic spin injection which can be readily tuned by modulating an external ac field.

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