Well-defined insulating band for electronic transport through a laterally coupled double-quantum-dot chain: Nonequilibrium Green’s function calculations

Gong, Wei‐Jiang; Zheng, Yisong; Yu, Lu; Lü, Tianquan

doi:10.1103/physrevb.73.245329

Cited by 105 publications

(81 citation statements)

References 32 publications

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“…As a result, the Zeeman splitting of spin-dependent conductances in the region of such an asymmetric peak leads to the emergence of so-called spin-polarized window (SPW) when there is high probability of tunneling for the electrons with spin σ and close-to-zero one for the electrons with spin σ [14][15][16][17] . For the QD-networks previously proposed as spin-filter prototypes in [15][16][17] it is highly preferable to have many QDs considering the Coulomb correlations inside each QD but not between them. In this article we will show that the nanosized diamond-shaped cell composed of just four QDs, a quadruple quantum-dot cell (QQD cell), can display perfect spin filtering properties.…”

Section: Introductionmentioning

confidence: 99%

Coulomb interactions-induced perfect spin-filtering effect in a quadruple quantum-dot cell

Kagan

Вальков

Aksenov

2017

Journal of Magnetism and Magnetic Materials

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A quadruple quantum-dot (QQD) cell is proposed as a spin filter. The transport properties of the QQD cell were studied in linear response regime on the basis of the equations of motion for retarded Green's functions. The developed approach allowed us to take into account the influence of both intra-and interdot Coulomb interactions on carriers' spin polarization. It was shown that the presence of the insulating bands in the conductance due to the Coulomb correlations results in the emergence of spin-polarized windows (SPWs) in magnetic field leading to the high spin polarization. We demonstrated the SPWs can be effectively manipulated by gate fields and considering the hopping between central dots in both isotropic and anisotropic regimes.

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Section: Introductionmentioning

confidence: 99%

Coulomb interactions-induced perfect spin-filtering effect in a quadruple quantum-dot cell

Kagan

Вальков

Aksenov

2017

Journal of Magnetism and Magnetic Materials

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“…And S jσ = z−εj −Uj z−εj −Uj +Uj njσ accounts for the contribution of the Coulomb interaction up to the second-order approximation [19,20]. The average electron occupation number in QD is determined by the relations…”

Section: Modelmentioning

confidence: 99%

Spin-dependent electron transport through a parallel double-quantum-dot structure

Gong

Zheng

2009

Physica E: Low-dimensional Systems and Nanostructures

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Electron transport properties in a parallel double-quantum-dot structure with three-terminals are theoretically studied. By introducing a local Rashba spin-orbit coupling, we find that an incident electron from one terminal can select a specific terminal to depart from the quantum dots according to its spin state. As a result, spin polarization and spin separation can be simultaneously realized in this structure. And spin polarizations in different terminals can be inverted by tuning the structure parameters. The underlying quantum interference that gives rise to such a result is analyzed in the language of Feynman paths for the electron transmission.

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“…¥ matrix, describing the coupling strength between the QDs in the interferometer arms and lead-L [27,28]…”

mentioning

confidence: 99%

“…is the zero-order Green function of the QD-m unperturbed by another QD, with [27,29]. In addition, the advanced Green function can be readily obtained via a relation †…”

mentioning

confidence: 99%

Bound states in the continuum in electronic transport through parallel‐coupled quantum‐dot structures

Han

Gong

Wei

2009

Physica Status Solidi (b)

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The occurrence of bound states in continuum (BICs) are theoretically studied, by investigating the electronic transport through coupled quantum‐dot structures (a quantum‐dot chain and a quantum‐dot ring) embodied in an Aharonov–Bohm interferometer. It is found that for the structure of a quantum‐dot chain, the BICs will come into being only under the condition of the same‐numbered quantum dots coupled to the quantum dots in the arms of the interferometer. But with respect to the quantum‐dot ring, the occurrence of BICs is remarkable, independent of the number of quantum dots in the ring. Furthermore, by the presence of an appropriate magnetic flux through the interferometer, the linear conductance spectrum of the (2n + 1)‐quantum‐dot ring (n ∈ integer) is the same as that of the 2n ‐quantum‐dot chain, on account of the occurrence of BICs in electron transport through these two kinds of systems. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Well-defined insulating band for electronic transport through a laterally coupled double-quantum-dot chain: Nonequilibrium Green’s function calculations

Cited by 105 publications

References 32 publications

Coulomb interactions-induced perfect spin-filtering effect in a quadruple quantum-dot cell

Coulomb interactions-induced perfect spin-filtering effect in a quadruple quantum-dot cell

Spin-dependent electron transport through a parallel double-quantum-dot structure

Bound states in the continuum in electronic transport through parallel‐coupled quantum‐dot structures

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