Andreev reflection in monolayer MoS<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>

Majidi, Leyla; Rostami, Habib; Asgari, Reza

doi:10.1103/physrevb.89.045413

Cited by 32 publications

(42 citation statements)

References 32 publications

(40 reference statements)

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“…We have found that the presence of the mass asymmetry term (α) in the Hamiltonian of MoS 2 has no significant effect on the charge conductance of the CT and CAR processes (similar behavior has been demonstrated for AR process in Ref. [57]). Therefore, we set α = 0 in our investigations.…”

Section: A Charge Conductancesupporting

confidence: 77%

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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Section: A Charge Conductancesupporting

confidence: 77%

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

Majidi

Asgari

2014

Phys. Rev. B

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“…Moreover, we find that the presence of the mass asymmetry term (α) in the Hamiltonian of MoS 2 has no significant effect on the valley-and spin-resolved conductances (similar behaviors have been demonstrated for local and nonlocal AR processes in Refs. [28,29]). …”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…Also, the single-layer and multi-layer MoS 2 can be n-or p-type doped on generating desirable charge carriers [7,8]. Recently, the properties of the charge, spin and valley transport in a monolayer molybdenum disulfide p/n/p [27], ferromagnetic/superconducting/ferromagnetic (F/S/F) [28] and normal/superconducting (N/S) [29] junctions have been investigated.…”

Section: Introductionmentioning

confidence: 99%

Valley- and spin-filter in monolayer MoS2

Majidi

Zare

Asgari

2014

Solid State Communications

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We propose a valley-and spin-filter based on a normal/ferromagnetic/normal molybdenum disulfide (MoS 2 ) junction where the polarizations of the valley and the spin can be inverted by reversing the direction of the exchange field in the ferromagnetic region. By using a modified Dirac Hamiltonian and the scattering formalism, we find that the polarizations can be tuned by applying a gate voltage and changing the exchange field in the structure. We further demonstrate that the presence of a topological term (β) in the Hamiltonian results in an enhancement or a reduction of the charge conductance depending on the value of the exchange field.PACS numbers:

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“…Here, motivated by experimental and some theoretical studies [16][17][18][19][20][21][22], we investigate the Josephson effect through the ML-MoS 2 both at its normal and spin-polarized (magnetic) states. If we induce conventional s-wave superconductivity in ML-MoS 2 via proximity, the Cooper pairs are formed from excitations from different (opposite) valleys and having opposite spins, very similar to the case of graphene [23].…”

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Gate-controlled supercurrent reversal in MoS ₂ -based Josephson junctions

Rameshti

Moghaddam

Zareyan

2014

EPL

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-Motivated by recent experiments revealing superconductivity in MoS2, we investigate the Josephson effect in the monolayer MoS2 at the presence of an exchange splitting. We show that the supercurrent reversal known as 0 − π transition can occur by varying the doping via gate voltages. This is in contrast to common superconductor/ferromagnet/superconductor junctions in which successive 0 − π transition take place with the variation of junction length or temperature. In fact for the case of MoS2 we find that both the amplitude and the period of oscillations show a dependence on the doping which explains the predicted doping induced supercurrent reversal. These effects comes from the dependence of density and Fermi velocity on the doping strength beside the intrinsic spin splitting in the valence band which originates from spin-orbit interaction.Exotic and peculiar behaviors in low and specially two dimensional (2D) systems have been in the heart of interests of condensed matter physicists for decades [1]. But by isolation of one-and few-atomic layer thick materials at 2004, many new and potentially of great technological importance phenomena have been revealed in 2D systems [2]. Recently few-and monolayers of transition metal dichalcogenides (TMD) are synthesized [3][4][5] and it has been observed that they can have very diverse properties including metallic, semiconducting and even superconducting behaviors [5,6]. Due to its promising application in optoelectronics as a direct band gap semiconductor, monolayer Molybdenum Disulfide (ML-MoS 2 ) has attracted more interest among monolayers of other TMD [7][8][9][10][11]. Moreover, it has a strong intrinsic spin-orbit coupling which results in the spin-split valence subbands separated by ∼ 160 meV from each other. Combined with the fact that we have two valleys K and K ′ in the band structure, a rich spin and valley physics including valley and spin Hall effects is exhibited in ML-MoS 2 devices [12]. In addition it can have promising applications in nano-electronics [13], spintronics [14].A recent experiment has shown evidences of proximity induced superconductivity in MoS 2 using superconducting gates at the presence of solid and liquid gating [15]. Here, motivated by experimental and some theoretical studies [16-22], we investigate the Josephson effect through the ML-MoS 2 both at its normal and spin-polarized (magnetic) states. If we induce conventional s-wave superconductivity in ML-MoS 2 via proximity, the Cooper pairs are formed from excitations from different (opposite) valleys and having opposite spins, very similar to the case of graphene [23]. This ensures that the Cooper pairs carry no momentum and net spin, in agreement with the fact that pairing occurs between time reversal partners. Subsequently, Andreev reflection which is the conversion of electron and hole excitations to each other [24], will switch both the valley and spin subbands (see Fig. 1).In this letter, first we study the effect of doping on the critical current which reveals that fo...

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Andreev reflection in monolayer MoS2

Cited by 32 publications

References 32 publications

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

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

Valley- and spin-filter in monolayer MoS2

Gate-controlled supercurrent reversal in MoS ₂ -based Josephson junctions

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Andreev reflection in monolayer MoS2

Cited by 32 publications

References 32 publications

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

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

Valley- and spin-filter in monolayer MoS2

Gate-controlled supercurrent reversal in MoS 2 -based Josephson junctions

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About

Gate-controlled supercurrent reversal in MoS ₂ -based Josephson junctions