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Magnetoresistance and transistor-like behavior of a double quantum-dot via crossed Andreev reflections
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10.1063/1.4723000
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Affiliations:
1 Departamento de Física e Química, Universidade Estadual Paulista—UNESP, Av. Brasil, Centro, 15385-000 Ilha Solteira, SP, Brasil
2 Instituto de Física “Gleb Wataghin,” Universidade Estadual de Campinas (UNICAMP), 13083-859 Campinas, SP, Brasil
a) Electronic mail: ecosta@dfq.feis.unesp.br.
b) Electronic mail: cabrera@ifi.unicamp.br.
J. Appl. Phys. 111, 113905 (2012)
/content/aip/journal/jap/111/11/10.1063/1.4723000
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/11/10.1063/1.4723000
View: Figures

## Figures

FIG. 1.

Schematic diagram showing the (F 1,F 2)-QDa -QDb -S system. The magnetization of is assumed to be fixed and the magnetization of can be varied for an angle with respect to the magnetization. and are the external potentials applied to and , respectively, while the superconductor is grounded. Gate voltages are also applied to the QDs, with and being the potentials applied to and , respectively.

FIG. 2.

Magnetoresistance and corresponding currents and through the system for different values of the applied bias and . (a) . (b) . (c) . Fixed parameters: , , , , , , , . All the parameters are expressed in superconductor gap units.

FIG. 3.

Current through the terminal for (red curve) and (black curve) for different values of the intradot interaction . Fixed parameters: , , , , , , , . All the parameters are expressed in superconductor gap units.

FIG. 4.

Current through the terminal for different values of hopping parameter . (a) and (b): ; (c) and (d): ; (e) and (f): . Fixed parameters: , , , , , and . All the parameters are expressed in superconductor gap units.

FIG. 5.

(a) Currents through the one-terminal system (solid black curve) and the two-terminals system (red dashed-dotted curve). (b) Corresponding differential conductance curves. (c) Transmittance curves for crossed AR of the two-terminal system. represents the transmittance for an up-spin electron of to be reflected as a down-spin hole of ; represents the transmittance for an up-spin electron of to be reflected as a down-spin hole of . (d) Transmittance curve for the one-terminal system . Fixed parameters: , , , , , . , and for the system with two-terminals, and and for the system with one ferromagnet. All the parameters are expressed in superconductor gap units.

FIG. 6.

Current through the terminal as a function of the gate voltages and . (a) and. (b) and . (c) and . (d) and . Fixed parameters: , , , , , , . All the parameters are expressed in superconductor gap units.

FIG. 7.

LDOS for the QDs for some values of the gate voltage . LDOS-A is the density of states of the QD connected to the ferromagnets. LDOS-B is the density of states of the second QD, connected to the superconductor. (a) LDOS-A with and . (b) LDOS-B with and . (c) LDOS-A with and . (d) LDOS-B with and . Fixed parameters: , , , , , , . All the parameters are expressed in superconductor gap units.

/content/aip/journal/jap/111/11/10.1063/1.4723000
2012-06-04
2014-04-24

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