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Fano antiresonance and perfect spin-filtering in a diamondlike quantum network device: Nonequilibrium Green’s function approach
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10.1063/1.4712024
/content/aip/journal/jap/111/9/10.1063/1.4712024
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/9/10.1063/1.4712024
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

A schematic illustration of the linear diamondlike network device composed of multiple quantum dots and contacted with two nonmagnetic metal leads.

Image of FIG. 2.
FIG. 2.

The influence of the energy difference Δ between the site energy in the upper and down QDs in the network on the conductance spectra of the structure with the chain size L = 5. The energy levels are set as ɛ i = ɛ0, ɛ i = ɛ0 – Δ and ɛ i = ɛ0 + Δ, where the energy difference Δ is chosen as 0, 0.1t 0, 0.2t 0, 0.5t 0, and t 0, while the many-body effect is not considered by setting U = 0.

Image of FIG. 3.
FIG. 3.

The linear conductance spectra versus the energy ɛ0 for three particular structures of L = 5. (a) The case of ɛ i = ɛ i = ɛ0 and ɛ i = ɛ0 + (i − 3)Δ. (b) The case of ɛ i = ɛ i = ɛ0 + (i − 3)Δ, and ɛ i = ɛ0. (c)The case of ɛ i = ɛ0, ɛ i = ɛ0 + (i − 3)Δ and ɛ i = ɛ0 + (i+3)Δ. These energy levels in the network are also plotted in the insets of the corresponding figure. In the above three cases, Δ is set as 0.1 and 0.5t 0. In addition, the other parameters are set as Γ L = t 0 and U = 0.

Image of FIG. 4.
FIG. 4.

The linear conductance spectra of the network device versus the energy level ɛ0 for a particular structure, where the energy levels of the system are set as ɛ i = ɛ i = ɛ0 and ɛ i = ɛ0 + Δ. Panels (a) and (b) show the influence of the energy difference Δ on the conductance spectra, where Δ is set as 0, 0.5t 0, t 0, and 2t 0. Panels (c) and (d) show the influence of the chain size L on the conductance spectra, where L is set from 1 to 5. The other parameters are set as Γ L = t 0 and U = 0.

Image of FIG. 5.
FIG. 5.

The spin split of the conductance spectra of the network device for L = 5. The parameters are set as follows: (a) The first structure of ɛ i = ɛ0 – Δ + σB, ɛ i = ɛ0 + Δ + σB and ɛ i = ɛ0 + σB, where Δ = t 0 and B = 0.2t 0. (b) The second structure of ɛ i = ɛ0 + Δ + σB and ɛ i i = ɛ0 + σB, where Δ = 2t 0 and B = 0.2t 0. In addition, the other parameters are Γ L = t 0 and U = 0.

Image of FIG. 6.
FIG. 6.

The linear conductance spectra of the network device with L = 5 versus the energy level ɛ0, where the many-body effect due to the intradot electron-electron interaction is taken into account. The left panels show the conductance spectra of the first structure in which the energy levels of the system are set as ɛ i = ɛ0 – Δ + σB, ɛ i = ɛ0 + Δ + σB, and ɛ i = ɛ0 + σB where Δ = t 0, and the right panels show the conductance spectra of the second structure in which ɛ i = ɛ0 + Δ + σB and ɛ i = ɛ i = ɛ0 + σB where Δ = 2t 0 From up to down, the electron interaction parameter U is set as 0.2t 0, 0.5t 0 and t 0, and in the last case, an external magnetic field B = 0.1t 0 is applied.

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/content/aip/journal/jap/111/9/10.1063/1.4712024
2012-05-14
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Fano antiresonance and perfect spin-filtering in a diamondlike quantum network device: Nonequilibrium Green’s function approach
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/9/10.1063/1.4712024
10.1063/1.4712024
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