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Effect of transverse electric field on helical edge states in a quantum spin-Hall system
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10.1063/1.3664776
/content/aip/journal/apl/99/22/10.1063/1.3664776
http://aip.metastore.ingenta.com/content/aip/journal/apl/99/22/10.1063/1.3664776
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Energy spectra of spin-up (green or light gray lines) andspin-down (blue or dark gray lines) edge states for a strip with W = 500 nm and ε r  = 21, where other parameters are adopted5 as A = 364.5 meV nm, B = −686 meV nm2, C = 0, M = −10 meV, and D = −512 meV nm2. Here the strength of electric field Et is (a) 0 V/m, (b) 1 × 104 V/m, (c) 1 × 105 V/m, (d) 1.5 × 105 V/m, (e) 3 × 105 V/m, and (f) 5 × 105 V/m.

Image of FIG. 2.
FIG. 2.

(Color online) The density distribution for a strip of W = 1000 nm in the absence of electric field for (a) kx  = 1 × 107 m−1 and (b) kx  = −1 × 107 m−1. (c) The gap for edge states as a function of strip width W.

Image of FIG. 3.
FIG. 3.

(Color online) (a) Energy spectra of edge states for a narrow strip of W = 200 nm under different transverse electric field Et  = 0 V/m (red solid lines), 1 × 106 V/m (blue dash lines), 2 × 106 V/m (green dash-dot lines), and 2.6 × 106 V/m (black dot lines). (b) The conductance of the system as a function of Et , where W = 120 nm, Ef  = 8 meV, and the length of the strip is 400 nm.

Image of FIG. 4.
FIG. 4.

(Color online) The density distribution (green or light gray lines) and (blue or dark gray lines), where , W = 500 nm, and Et (a)0 × 105 V/m, (b) 1 × 104 V/m, (c), 1 × 105 V/m, (d) 1.5 × 105 V/m, (e) 3 × 105 V/m, and (f) 5 × 105 V/m.

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/content/aip/journal/apl/99/22/10.1063/1.3664776
2011-12-02
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effect of transverse electric field on helical edge states in a quantum spin-Hall system
http://aip.metastore.ingenta.com/content/aip/journal/apl/99/22/10.1063/1.3664776
10.1063/1.3664776
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