Proximity-induced mixed odd- and even-frequency pairing in monolayer<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>NbSe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>

Aliabad, Mojtaba Rahimi; Zare, Mohammad-Hossein

doi:10.1103/physrevb.97.224503

Cited by 14 publications

(15 citation statements)

References 65 publications

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“…In this case, the magnitudes of the odd‐frequency correlations dominate over the even‐frequency amplitudes at discrete energy levels coinciding exactly with peaks in the local density of states, indicating a relationship between these odd‐frequency pair amplitudes and McMillan–Rowell oscillations as well as midgap Andreev resonances . Similar phenomena have also been predicted to arise in layered 2D systems, like vdW heterostructures, in which one of the components is superconducting . Given the growing number of vdW systems available, the high level of tunability of their properties, and the presence of a 2D surface accessible for interrogation by experiments, vdW systems are ideal candidates for studying odd‐frequency superconducting states.…”

Section: Superconductor‐based Van Der Waals Systemssupporting

confidence: 58%

“…[175][176][177] Similar phenomena have also been predicted to arise in layered 2D systems, like vdW heterostructures, in which one of the components is superconducting. [16,[178][179][180][181][182][183][184][185] Given the growing number of vdW systems available, the high level of tunability of their properties, and the presence of a 2D surface accessible for interrogation by experiments, vdW systems are ideal candidates for studying oddfrequency superconducting states.…”

Section: Odd-frequency Pairingmentioning

confidence: 99%

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Van Der Waals Heterostructures with Spin‐Orbit Coupling

Rossi

Triola

2019

Annalen der Physik

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Herein, recent work on van der Waals (vdW) systems in which at least one of the components has strong spin‐orbit coupling is reviewed, focussing on a selection of vdW heterostructures to exemplify the type of interesting electronic properties that can arise in these systems. First a general effective model to describe the low energy electronic degrees of freedom in these systems is presented. The model is then applied to study the case of (vdW) systems formed by a graphene sheet and a topological insulator. The electronic transport properties of such systems are discussed and it is shown how they exhibit much stronger spin‐dependent transport effects than isolated topological insulators. Then, vdW systems are considered in which the layer with strong spin‐orbit coupling is a monolayer transition metal dichalcogenide (TMD) and graphene‐TMD systems are briefly discussed. In the second part of the article, a case is discussed in which the vdW system includes a superconducting layer in addition to the layer with strong spin‐orbit coupling. It is shown in detail how these systems can be designed to realize odd‐frequency superconducting pair correlations. Finally, twisted graphene‐NbSe2 bilayer systems are discussed as an example in which the strength of the proximity‐induced superconducting pairing in the normal layer, and its Ising character, can be tuned via the relative twist angle between the two layers forming the heterostructure.

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Section: Superconductor‐based Van Der Waals Systemssupporting

confidence: 58%

Section: Odd-frequency Pairingmentioning

confidence: 99%

Van Der Waals Heterostructures with Spin‐Orbit Coupling

Rossi

Triola

2019

Annalen der Physik

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“…The in-plane upper critical field of the Ising superconductor (ISC) far exceeds the Pauli paramagnetic limit because of the presence of ISOC 12 . The superconducting phase diagrams and the topological properties [13][14][15][16] of ISC are also theoretically studied in monolayer transition-metal dichalcogenides. It is predicted that the topologically non-trivial phase can support the chiral Majorana edge states 13 .…”

Section: Introductionmentioning

confidence: 99%

Switch effect and 0- π transition in Ising superconductor Josephson junctions

Cheng

Sun

2019

Phys. Rev. B

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We theoretically study the Josephson current in Ising superconductor−half-metal−Ising superconductor junctions. By solving the Bogoliubov-de Gennes equations, the Josephson currents contributed by the discrete Andreev levels and the continuous spectrum are obtained. For very short junctions, because the direct tunneling of the Cooper pair dominates the Josephson current, the current-phase difference relation is independent of the magnetization direction, which is the same as the conventional superconductor-ferromagnet-superconductor junctions. On the other hand, when the length of the half-metal is similar to or greater than the superconducting coherence length, the spin-triplet Josephson effect occurs and dominates the Josephson current. In this case, the currentphase difference relations show the strong magnetoanisotropic behaviors with the period π. When the magnetization direction points to the ±z directions, the current is zero regardless of the phase difference. However, the current has a large value when the magnetization direction is parallel to the junction plane, which leads to a perfect switch effect of the Josephson current. Furthermore, we find that the long junctions can host both the 0-state and π-state, and the 0-π transitions can be achieved with the change of the magnetization direction. The physical origins of the switch effect and 0-π transitions are interpreted from the perspectives of the spin-triplet Andreev reflection, the Ising pairing order parameter and the Ginzburg-Landau type of free energy. In addition, the influences of the chemical potential, the magnetization magnitude and the strength of the Ising spin-orbit coupling on the switch effect and 0-π transitions are also investigated. Furthermore, the two-dimensional Josephson junctions are also investigated and we show that the spin-triplet Josephson effect can exist always. These results provide a convenient way to control the Josephson critical current and to adjust the junctions between the 0-state and π-state by only rotating one magnetization.PACS numbers:

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“…A powerful tool to investigate them is the symmetry analysis, which remains reliable even in the ambiguity of the pairing mechanism. Particularly, the discrete symmetries, such as time-reversal symmetry (TRS) or inversion symmetry (IS) play important roles [17][18][19][20] and would affect the properties of superconducting gap function [7,[21][22][23][24][25]. In that matter, if at least one of these symmetries is broken, Cooper pairs, which have an antisymmetric wave functions under the interchange of all quantum numbers, acquire exotic forms.…”

Section: Introductionmentioning

confidence: 99%

“…This unequal time pairing yields oddfrequency superconducting couples for describing superfluidity [26], as well as, superconductivity [27]. Moreover, there are many proposals for the possibility of superconductor-ferromagnet (FM) junctions to realize induced odd-frequency pairing, or the admixture of evenand odd-frequency Cooper pairings [20,28,29].…”

Section: Introductionmentioning

confidence: 99%

Superconductivity of mixed parity and frequency in an anisotropic spin-orbit coupling

Biderang,

Zare,

Akbari

2019

Preprint

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We illuminate the superconducting phases in [001]-grown-noncentrosymmetric quantum wells with an anisotropic spin-orbit coupling in the presence of on-site Hubbard interaction. Within the random phase approximation, we investigate the spin-fluctuation-mediated pairing in the presence of Rashba/Dresselhaus antisymmetric spin-orbit couplings. Although the existence of spatial inversion symmetry desires a dominant d-wave pairing for all filling levels, a broken inversion symmetry generates antisymmetric spin-orbit coupling and mixes the even-and odd-parity in the superconducting gap. We study the symmetry of the mixed-parity gap for various strengths of Hubbard interaction. Besides, we consider a superconductor-ferromagnet junction to survey the modifications of superconducting order parameters, and observe an admixture of even-and odd-frequencies due to the ferromagnet exchange field.

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Proximity-induced mixed odd- and even-frequency pairing in monolayerNbSe2

Cited by 14 publications

References 65 publications

Van Der Waals Heterostructures with Spin‐Orbit Coupling

Van Der Waals Heterostructures with Spin‐Orbit Coupling

Switch effect and 0- π transition in Ising superconductor Josephson junctions

Superconductivity of mixed parity and frequency in an anisotropic spin-orbit coupling

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