Quantum transport of injected electrons in an asymmetric FM/I1/SC/I2/FM junction: Directional dependence

Soodchomshom, Bumned; Tang, I‐Ming; Hoonsawat, Rassmidara

doi:10.1016/j.physc.2008.04.014

Physica C: Superconductivity and its Applications

2008

DOI: 10.1016/j.physc.2008.04.014

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Quantum transport of injected electrons in an asymmetric FM/I1/SC/I2/FM junction: Directional dependence

Bumned Soodchomshom

I‐Ming Tang

Rassmidara Hoonsawat

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Cited by 2 publications

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References 37 publications

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“…Thus, with the existing capability to create hybrid structures involving FM and SC graphene, researchers are now seeking breakthroughs involving graphenebased low temperature spintronic devices. The effectiveness of a graphene spin valve or switch involving both ferromagnet (F) and superconductor (S) elements in contact is based on proximity effects, which dictate the behavior of both the singlet and triplet pairing correlations in each region [6][7][8][9][10][11]. In graphene, as opposed to most conventional materials, the Fermi level can be tuned via a gate potential.…”

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confidence: 99%

Spin-Controlled Superconductivity and Tunable Triplet Correlations in Graphene Nanostructures

2013

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We study graphene ferromagnet/superconductor/ferromagnet (F/S/F) nanostructures via a microscopic self-consistent Dirac Bogoliubov-de Gennes formalism. We show that as a result of proximity effects, experimentally accessible spin switching phenomena can occur as one tunes the Fermi level μF of the F regions or varies the angle θ between exchange field orientations. Superconductivity can then be switched on and off by varying either θ or μF (a spin-controlled superconducting graphene switch). The induced equal-spin triplet correlations in S can be controlled by tuning μF, effectively making a graphene based two-dimensional spin-triplet valve.

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Spin-Controlled Superconductivity and Tunable Triplet Correlations in Graphene Nanostructures

2013

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Valley- and spin-switch effects in molybdenum disulfide superconducting spin valve

Majidi

Asgari

2014

Phys. Rev. B

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We propose a hole-doped molybdenum disulfide (MoS2) superconducting spin valve (F/S/F) hybrid structure in which the Andreev reflection process is suppressed for all incoming waves with a determined range of the chemical potential in ferromagnetic (F) region and the cross-conductance in the right F region depends crucially on the configuration of magnetizations in the two F regions. Using the scattering formalism, we find that the transport is mediated purely by elastic electron cotunneling (CT) process in a parallel configuration and changes to the pure crossed Andreev reflection (CAR) process in the low-energy regime, without fixing of a unique parameter, by reversing the direction of magnetization in the right F region. This suggests both valley-and spin-switch effects between the perfect elastic CT and perfect CAR processes and makes the nonlocal charge current to be fully valley-and spin-polarized inside the right F region where the type of the polarizations can be changed by reversing the magnetization direction in the right F region. We further demonstrate that the presence of the strong spin-orbit interaction λ and an additional topological term (β) in the Hamiltonian of MoS2 result in an enhancement of the charge conductance of the CT and CAR processes and make them to be present for long lengths of the superconducting region. Besides, we find that the thermal conductance of the structure with a small length of the highly doped superconducting region exhibits linear dependence on the temperature at low temperatures whereas it enhances exponentially at higher temperatures. In particular, we demonstrate that the thermal conductance versus the strength of the exchange field (h) in F region displays a maximum value at h < λ, which moves towards larger exchange fields by increasing the temperature.

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Quantum transport of injected electrons in an asymmetric FM/I1/SC/I2/FM junction: Directional dependence

Cited by 2 publications

References 37 publications

Spin-Controlled Superconductivity and Tunable Triplet Correlations in Graphene Nanostructures

Spin-Controlled Superconductivity and Tunable Triplet Correlations in Graphene Nanostructures

Valley- and spin-switch effects in molybdenum disulfide superconducting spin valve

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