Spin-charge filtering through a spin-orbit coupled quantum dot controlled via an Aharonov-Bohm interferometer

Heary, Ryan; Han, Jong E.; Zhu, Lingyin

doi:10.1103/physrevb.77.115132

Cited by 26 publications

(14 citation statements)

References 27 publications

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“…With respect to the coupled-QD structures, the typical one is Aharonov-Bohm (AB) interferometer with one QD or whose individual arm is of one QD, respectively [12-38]. In such kind of structure, the AB phase can adjust the quantum interference, leading to abundant interesting results.…”

Section: Introductionmentioning

confidence: 99%

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Spin accumulation assisted by the Aharonov-Bohm-Fano effect of quantum dot structures

et al. 2012

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We investigate the spin accumulations of Aharonov-Bohm interferometers with embedded quantum dots by considering spin bias in the leads. It is found that regardless of the interferometer configurations, the spin accumulations are closely determined by their quantum interference features. This is mainly manifested in the dependence of spin accumulations on the threaded magnetic flux and the nonresonant transmission process. Namely, the Aharonov-Bohm-Fano effect is a necessary condition to achieve the spin accumulation in the quantum dot of the resonant channel. Further analysis showed that in the double-dot interferometer, the spin accumulation can be detailedly manipulated. The spin accumulation properties of such structures offer a new scheme of spin manipulation. When the intradot Coulomb interactions are taken into account, we find that the electron interactions are advantageous to the spin accumulation in the resonant channel.

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Section: Introductionmentioning

confidence: 99%

“…On the other hand, lots of theoretical investigations about electron transport behaviors of the AB interferometer have been reported. It was found that the interplay between the AB-Fano effect and the other mechanisms, e.g., Kondo physics and the spin-orbit interaction, indeed causes many interesting phenomena [24-38]. …”

Section: Introductionmentioning

confidence: 99%

Spin accumulation assisted by the Aharonov-Bohm-Fano effect of quantum dot structures

et al. 2012

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“…It has been argued, however, that the Rashba-type spin-orbit interaction alone is insufficient to realize finite spin transport or spin filtering effect. Because of it, there have been various suggestions how to attain spin transport by combining with other effect such as magnetic field, finite bias effect [1,2,3,4]. So far nonetheless, electrically generated spin-dependent transport due to many-body effect remains largely unexplored.…”

Section: Introductionmentioning

confidence: 99%

Spin current manipulation through a Rashba dot by tunable nonequilibrium Fano-Kondo effect

Taniguchi¹

2012

J. Phys.: Conf. Ser.

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Abstract. Though the Rashba-type spin-orbit interaction offers a possibility of manipulating electron's spin totally by electric field, it has been argued that the mere existence of spinorbit interaction is insufficient to produce such spin-dependent transport. In the present work, we investigate how spin transport through a single-level dot is possible: Finite spin current appears as a result of spin-orbit interaction, strong electronic correlation and finite bias voltage. We show, by applying finite interaction slave-boson mean field theory, that Kondo physics is responsible for generating such spin-dependent transport. IntroductionIn semiconducting devices, the Rashba-type spin-orbit interaction is generated by the potential asymmetry in the direction perpendicular to the semiconductor plane. Utilizing the effect opens up a possibility of controlling electron's spin totally by electric field alone. It has been argued, however, that the Rashba-type spin-orbit interaction alone is insufficient to realize finite spin transport or spin filtering effect. Because of it, there have been various suggestions how to attain spin transport by combining with other effect such as magnetic field, finite bias effect [1,2,3,4]. So far nonetheless, electrically generated spin-dependent transport due to many-body effect remains largely unexplored.In the present work, we investigate the electric generation of spin current and transport through an interacting Rashba dot (a dot with the Rashba spin-orbit interaction and the Coulomb interaction) embedded in a ring geometry. We will show that spin transport can manifest itself electrically once the following three conditions are met: (1) strong Coulomb interaction is present on the dot (2) under finite bias voltage V bias (3) at very low temperature T . Having the characteristic temperature of the system (= the Kondo temperature) seriously affected by the presence of the Rashba interaction and the Coulomb interaction, we need to treat both effects in a unified way. We argue that many-body effect responsible for generating spin current originates from Kondo physic, so that either too large bias voltage or temperature destroys the effect.

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“…21 For spin-orbit quantum-dot Aharonov-Bohm systems, the spin polarization can be controlled by tuning the magnetic flux and the Rashba strength. 22 More importantly, using numerical renormalization-group ͑NRG͒ methods it has been argued that a compensation effect takes place when an external Zeeman field is applied, eliminating the splitting due to the spin-orbit interaction in the Kondo local density of states. 23 This situation is also seen in single dots coupled to ferromagnetic cases, for which spindependent coupling leads to the splitting of the dot spectral weights 24 via an effective field for gate voltages away from the particle-hole symmetric point.…”

Section: Introductionmentioning

confidence: 99%

Kondo effect in spin-orbit mesoscopic interferometers

et al. 2010

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We consider a flux-threaded Aharonov-Bohm ring with an embedded quantum dot coupled to two normal leads. The local Rashba spin-orbit interaction acting on the dot electrons leads to a spin-dependent phase factor in addition to the Aharonov-Bohm phase caused by the external flux. Using the numerical renormalization group method, we find a splitting of the Kondo resonance at the Fermi level which can be compensated by an external magnetic field. To fully understand the nature of this compensation effect, we perform a scaling analysis and derive an expression for the effective magnetic field. The analysis is based on a tight-binding model which leads to an effective Anderson model with a spin-dependent density of states for the transformed lead states. We find that the effective field originates from the combined effect of Rashba interaction and magnetic flux and that it contains important corrections due to electron-electron interactions. We show that the compensating field is an oscillatory function of both the spin-orbit and the Aharonov-Bohm phases. Moreover, the effective field never vanishes due to the particle-hole symmetry breaking independently of the gate voltage.Comment: 9 pages, 5 figure

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Spin-charge filtering through a spin-orbit coupled quantum dot controlled via an Aharonov-Bohm interferometer

Cited by 26 publications

References 27 publications

Spin accumulation assisted by the Aharonov-Bohm-Fano effect of quantum dot structures

Spin accumulation assisted by the Aharonov-Bohm-Fano effect of quantum dot structures

Spin current manipulation through a Rashba dot by tunable nonequilibrium Fano-Kondo effect

Kondo effect in spin-orbit mesoscopic interferometers

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