Spin-dependent Andreev reflection in a three-terminal Aharonov-Bohm interferometer with coherent indirect coupling

Zhang, Rong; Peng, Xiong-Feng; Han, Kui; Shen, Yifeng; Tang, Furong; Bai, Long

doi:10.1140/epjb/e2012-30569-0

Cited by 3 publications

(3 citation statements)

References 36 publications

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“…Another interesting example of QD hybrid systems is the QD coupled to a normal (or ferromagnetic) and a superconducting leads (N(F)-QD-S) [73][74][75][76][77][78][79][80][81]. The presence of the superconducting elctrode not only significantly alters the thermoelectric characters [38,[82][83][84], but also provides some additional information [85], as demonstrated with Andreev interferometers [86,87].…”

Section: Introductionmentioning

confidence: 99%

Large enhancement of thermoelectric effects in a tunneling-coupled parallel DQD-AB ring attached to one normal and one superconducting lead

Yao

Zhang

et al. 2018

J. Phys. D: Appl. Phys.

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We theoretically investigate the thermoelectric properties in a tunneling-coupled parallel DQD-AB ring attached to one normal and one superconducting lead. The role of the intrinsic and extrinsic parameters in improving thermoelectric properties is discussed. The peak value of figure of merit near gap edges increases with the asymmetry parameter decreasing, particularly, when asymmetry parameter is less than 0.5, the figure of merit near gap edges rapidly rises. When the interdot coupling strengh is less than the superconducting gap the thermopower spectrum presents a single-platform structure. While when the interdot coupling strengh is larger than the gap, a double-platform structure appears in thermopower spectrum. Outside the gap the peak values of figure of merit might reach the order of 102. On the basis of optimizing internal parameters the thermoelectric conversion efficiency of the device can be further improved by appropriately matching the total magnetic flux and the flux difference between two subrings.

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Section: Introductionmentioning

confidence: 99%

Large enhancement of thermoelectric effects in a tunneling-coupled parallel DQD-AB ring attached to one normal and one superconducting lead

Yao

Zhang

et al. 2018

J. Phys. D: Appl. Phys.

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“…The electrons are also submitted to Coulomb correlations within the QD. All these features lead to rather complex spectral properties for the QD [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. More specifically, a multi-peak structure has been observed in a F-QD-S nanostructure caused by the interplay between Coulomb correlations and Zeeman splitting due to an external magnetic field [18].…”

Section: Introductionmentioning

confidence: 99%

Fano effect and Andreev bound states in a hybrid superconductor–ferromagnetic nanostructure

et al. 2015

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In this work, it is considered a hybrid nanostructure composed by a quantum dot coupled to two ferromagnetic leads and a superconductor lead. It is shown that the zero-bias transmittance for the co-tunneling between the ferromagnetic leads presents Fano anti-resonances due to the destructive interference between the two spin channels mixing by the relative orientation of the magnetizations in the leads. When the superconductor is coupled to the system, electron-hole correlations between different spin states lead to a resonance in the place of the dip appearing in the transmittance. Such an effect is accompanied by two Fano anti-resonances explained by a "leakage" of conduction channels from the co-tunneling to the Andreev transport. In the non-equilibrium regime, correlations within the quantum dot introduce a dependence of the resonance condition on the finite bias applied to the ferromagnetic leads. However, it is still possible to observe signatures of the same interference effect in the electrical current.

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“…In these systems one is able to investigate purely quantum phenomena and the conduction of electrical current with a discrete flux of charges through the QDs 17 . As a result, new phenomena may arise concerning the transport properties of these systems [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33] . A particular feature of these hybrid F/S systems is the current dependence on QD spectral properties, besides the ferromagnet polarization.…”

Section: Introductionmentioning

confidence: 99%

Interference effects induced by Andreev bound states in a hybrid nanostructure composed by a quantum dot coupled to ferromagnetic and superconductor leads

Siqueira,

Orellana,

Seridonio

et al. 2014

Preprint

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Spin-dependent Andreev reflection in a three-terminal Aharonov-Bohm interferometer with coherent indirect coupling

Cited by 3 publications

References 36 publications

Large enhancement of thermoelectric effects in a tunneling-coupled parallel DQD-AB ring attached to one normal and one superconducting lead

Large enhancement of thermoelectric effects in a tunneling-coupled parallel DQD-AB ring attached to one normal and one superconducting lead

Fano effect and Andreev bound states in a hybrid superconductor–ferromagnetic nanostructure

Interference effects induced by Andreev bound states in a hybrid nanostructure composed by a quantum dot coupled to ferromagnetic and superconductor leads

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