Proximity induced time-reversal topological superconductivity in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Bi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>
 films without phase tuning

Casas, Oscar E.; Arrachea, Liliana; Herrera, William J.; Yeyati, A. Levy

doi:10.1103/physrevb.99.161301

Cited by 17 publications

(5 citation statements)

References 49 publications

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“…As a result, considering t p1τ ′ = t p2τ ′ is reasonable. In contrast, both the phases and magnitudes of the hopping constant for different 3DTI orbitals may be different, which may affect the nature of the induced pairing potential [47]. In the supplementary material, we present the numerical results by considering that the signs and magnitudes of interlayer hopping constants are orbital dependent.…”

Section: Model and Formalismmentioning

confidence: 99%

Proximity effect and inverse proximity effect in a topological-insulator/iron-based-superconductor heterostructure

Zhu,

Zhou

2023

Preprint

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We theoretically study the proximity effect and the inverse proximity effect in a topological insulator/iron-based superconductor heterostructure based on the microscopic model. The superconducting order parameter is self-consistently calculated. Its magnitude decreases when the coupling of these two systems increases. The induced pairing order parameter exhibits negative and positive values, while the negative pairing near the Γ = (0, 0) point is dominant. This parameter has twofold symmetry and includes an s-wave component and a d-wave component. The magnitude of the induced pairing order parameter has a maximal value at the coupling strength tp = 0.3 ≈ 0.06 eV. The spectral function and the local density of states are calculated and may be used to probe the proximity effect. We also discuss the feedback of the topological insulator to the iron-based superconductor layer. The normal-state Fermi surface is distorted by the coupling, and additional Fermi pockets are induced. An effective spin-orbit interaction term is induced. In the superconducting state, the previous fourfold symmetry of the order parameter is broken, and a d-wave component pairing term is also induced. Our main results can be well understood by analyzing the Fermi surfaces of the original systems.

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Section: Model and Formalismmentioning

confidence: 99%

Proximity effect and inverse proximity effect in a topological-insulator/iron-based-superconductor heterostructure

Zhu,

Zhou

2023

Preprint

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“…Since TRS is preserved, it belongs to Class DIII according to the ten-fold classification. On the boundary of the interface, there exist a pair of helical Majorana edge states [58][59][60][61][62][63][64][65][66][67].…”

Section: Helical Superconductivitymentioning

confidence: 99%

Spin-orbit-coupled superconductivity with spin-singlet non-unitary pairing

Zeng¹,

Xu²,

Wang³

et al. 2022

Preprint

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An unconventional superconductor is distinguished with two types of gap functions: unitary and non-unitary. This core subject has been concentrated on purely spin-triplet or singlet-triplet mixed superconductors. However, the generalization to a purely spin-singlet superconductor has remained primarily of theoretical interest, which requires at least a multi-orbital correlated electronic systems. In this work, we present a possible establishment of both unitary and non-unitary pairings for spin-singlet superconductors with two atomic orbitals. Then we investigate the effects of atomic spin-orbit coupling and find a new spin-orbit-coupled non-unitary superconductor that supports exotic phenomena. Remarkably, there are mainly three features. Firstly, the atomic spin-orbit coupling locks the electron spins to be out-of-plane, which could give birth to the Type II Ising superconductivity with a large in-plane upper critical field compared to the Pauli limit. Secondly, topological chiral or helical Majorana edge state could be realized even in the absence of external magnetic fields or Zeeman fields. In addition, a spin-polarized superconducting state could even be generated by spin-singlet non-unitary pairings with spontaneous time-reversal breaking, which severs as a smoking gun to detect this exotic state by measuring the spin-resolved density of states. Therefore, our work might pave a new avenue to spin-orbit-coupled superconductors with spin-singlet non-unitary pairing symmetries.

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“…Zero-energy SABS are Majorana modes, quasiparticles that are their antiparticle and exhibit nontrivial statistics, the reason why they could be implemented in topological quantum computing devices [53][54][55][56][57][58]. Additionally, placing a conventional superconductor in contact with the surface of a topological insulator(TI) gives rise to an artificial TS phase [51,[59][60][61][62][63][64][65]. The resulting superconducting order parameter has spinless pwave chiral symmetry, giving rise to chiral Majorana edge states (CMES) at the interface with a ferromagnetic region (F) [51,59,[61][62][63][64].…”

Section: Introductionmentioning

confidence: 99%

Long-range Cooper pair splitting by chiral Majorana edge states

Casas-Barrera¹,

Páez²,

Herrera³

2023

Preprint

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We analyze the transport properties of a Cooper pair splitter device made up of two-point electrodes in contact with a ferromagnetic/superconductor (F/S) junction built on the surface of a topological insulator. For the pair potential of the S region we consider s-and d-wave symmetries, and for the F region, we regard a magnetization vector normal to the TI surface. The non-local transport along the F/S interface is mediated by chiral Majorana edge states, with chirality controlled by the magnetization vector polarization. We show that the crossed Andreev reflection amplitude slowly decays with the separation of the electrodes for standard clean samples. Our system would reach a maximum Cooper pair-splitting efficiency of 80% for a symmetrical voltage configuration, even in high-temperature superconductors devices.

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Proximity induced time-reversal topological superconductivity in Bi2Se3 films without phase tuning

Cited by 17 publications

References 49 publications

Proximity effect and inverse proximity effect in a topological-insulator/iron-based-superconductor heterostructure

Proximity effect and inverse proximity effect in a topological-insulator/iron-based-superconductor heterostructure

Spin-orbit-coupled superconductivity with spin-singlet non-unitary pairing

Long-range Cooper pair splitting by chiral Majorana edge states

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