Perfect spin-filter and highly spin-polarized current in a quantum network device

Fu, Hua‐Hua; Yao, K.L.

doi:10.1063/1.3673840

Cited by 49 publications

(31 citation statements)

References 17 publications

(16 reference statements)

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“…Ref. [34]), which, however, will be studied elsewhere. We have verified that for DQD system in a similar geometry (with direct hopping between the leads included) the suppression of the majority conductance is much smaller than for QQD system, which is due to absence of resonant tunneling eigenstate |es 1 , see Appendix C.…”

Section: Spin-resolved Conductancesmentioning

confidence: 99%

“…The QQD system demonstrates a rather rich phase diagram with the possibility of controlling spin states of electrons [40], making it promising for the development of spintronic devices. It was shown that spin-polarized electron transport [34,[41][42][43], e.g. generated by tuning the energy levels or hopping levels in an external magnetic field [34,41], can be achieved in this structure.…”

Section: Introductionmentioning

confidence: 99%

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Local magnetic moments and electronic transport in closed loop quantum dot systems: A case of quadruple quantum dot ring at and away from equilibrium

Проценко

Катанин

2019

Phys. Rev. B

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We apply the non-equilibrium functional renormalization group approach treating flow of the electronic self-energies, to describe local magnetic moments formation and electronic transport in a quadruple quantum dot (QQD) ring, coupled to leads, with moderate Coulomb interaction on the quantum dots. We find that at zero temperature depending on parameters of the QQD system the regimes with zero, one, or two almost local magnetic moments in the ring can be realized, and the results of the considered approach in equilibrium agree qualitatively with those of more sophisticated fRG approach treating also flow of the vertices. It is shown that the almost formed local magnetic moments, which exist in the equilibrium, remain stable in a wide range of bias voltages near equilibrium. The destruction of the local magnetic moments with increasing bias voltage is realized in one or two stages, depending on the parameters of the system; for two-stage process the intermediate phase possesses fractional magnetic moment. We present zero-temperature results for current-voltage dependences and differential conductances of the system, which exhibit sharp features at the transition points between different magnetic states. The occurrence of interaction induced negative differential conductance phenomenon is demonstrated and discussed. For one local moment in the ring and finite hopping between the opposite quantum dots, connected to the leads, we find suppression of the conductance for one of the spin projections in infinitesimally small magnetic field, which occurs due to destructive interference of different electron propagation paths and can be used in spintronic devices. arXiv:1804.02965v3 [cond-mat.str-el]

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Section: Spin-resolved Conductancesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Local magnetic moments and electronic transport in closed loop quantum dot systems: A case of quadruple quantum dot ring at and away from equilibrium

Проценко

Катанин

2019

Phys. Rev. B

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“…Our calculations were performed with the density functional theory (DFT) and the nonequilibrium Green's function technique 24,25 . Geometry optimization and electronic structure calculations were first carried out with the SIESTA code 26 .…”

Section: Theory and Methodsmentioning

confidence: 99%

Design for a spin-Seebeck diode based on two-dimensional materials

et al. 2015

Phys. Rev. B

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Studies of the Spin-Seebeck effect (SSE) are very important for the developments of fundamental science and novel low-power-consumption technologies. Spin-Seebeck diode (SSD), in which the spin current can be driven by a forward temperature gradient but not by a reverse temperature gradient, is a key unit in spin caloritronic devices. Here, we propose a new design of SSD using two-dimensional (2D) materials such as the silicene and phosphorene nanoribbons as the source and drain. Due to their unique band structures and magnetic states, thermally driven spin-up and spindown currents flow in opposite directions. This mechanism is different from that of the previous one that uses two Permalloy circular disks [Phys. Rev. Lett. 2014, 112, 047203], and the SSD in our design can be easily integrated with gate voltage control. Since the concept of this design is rather general and applicable to many 2D materials, it is promising for the realization and exploitation of SSD in nanodevices. PACS number(s): 73.23.Hk

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“…11, 18 In our previous work, we proposed a practical design to realize perfect spin-filter through a network device composed of the multi-QDs based on the Fano antiresonance. 19 However, to realize a multi-QDs nanodevice which possesses multiple purposes, especially including the perfect spin-filtering and the quantum-signal generator, has not been reported so far.…”

Section: Introductionmentioning

confidence: 99%

Perfect spin-filter and quantum-signal generator in a parallel coupled multiple triple-quantum-dots device

Yao

2012

Journal of Applied Physics

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Electronic transport through a parallel coupled multiple triple-quantum-dots (tQDs) chain is theoretical studied. By producing an energy difference between the site energy of the upper QDs and the down ones and considering a Zeeman splitting, several highly to 100% spin-polarized windows (SPWs) with very steep edges appear in the linear conductance spectra due to the Fano antiresonance. Moreover, if the Dicke resonance is considered, some nearest SPWs with opposite direction of the spin polarization just contact with each other in some suitable conditions. These results strongly support that this multi-tQDs device can serve multiple purposes including perfect spin-filtering and quantum-signal generator. V C 2012 American Institute of Physics.

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Perfect spin-filter and highly spin-polarized current in a quantum network device

Abstract: Articles you may be interested inSpin polarized current from multiply-coupled rings with Zeeman-split quantum dots

Cited by 49 publications

References 17 publications

Local magnetic moments and electronic transport in closed loop quantum dot systems: A case of quadruple quantum dot ring at and away from equilibrium

Local magnetic moments and electronic transport in closed loop quantum dot systems: A case of quadruple quantum dot ring at and away from equilibrium

Design for a spin-Seebeck diode based on two-dimensional materials

Perfect spin-filter and quantum-signal generator in a parallel coupled multiple triple-quantum-dots device

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