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

Abstract

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 $\Gamma =(0,0)$ 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 $t_p=0.3\approx 0.06$ 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.

arXiv comment9 pages, 5 figures

References in corpus (39)

• Non-Abelian Anyons and Topological Quantum Computation
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Angle-resolved photoemission spectroscopy of the cuprate superconductors
• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• Superconductivity in Iron Compounds
• Scanning tunneling spectroscopy of high-temperature superconductors
• Observation of Majorana fermions with spin selective Andreev reflection in the vortex of topological superconductor
• Majorana mode in vortex core of Bi2Te3/NbSe2 topological insulator-superconductor heterostructure
• The Coexistence of Superconductivity and Topological Order in the Bi2Se3 Thin Films
• A minimal two-band model for the superconducting Fe-pnictides
• Unconventional superconductivity on a topological insulator
• Pairing Symmetry in a Two-Orbital Exchange Coupling Model of Oxypnictides
• Proximity effect at the superconductor - topological insulator interface
• Spin-triplet p-wave pairing in a 3-orbital model for iron pnictide superconductors
• Tight-binding models for the new iron based superconductor materials
• Superconducting gap symmetry of Ba0.6K0.4Fe2As2 studied by angle-resolved photoemission spectroscopy
• Proximity-induced high-temperature superconductivity in topological insulators Bi2Se3 and Bi2Te3
• Fully gapped topological surface states in Bi${}_2$Se${}_3$ films induced by a d-wave high-temperature superconductor
• Two-dimensional superconductivity at the interface of a Bi2Te3/FeTe heterostructure
• Proximity-induced unconventional superconductivity in topological insulators
• Experimental Consequences of the S-wave $\cos (k_x)\cdot \cos (k_y)$ Superconductivity in the Iron-Pnictides
• Surface magnetic ordering in topological insulators with bulk magnetic dopants
• Topological quantum states of matter in iron-based superconductors: From concepts to material realization
• Nonmagnetic Impurity Resonances as a Signature of Sign-Reversal Pairing in the FeAs-based Superconductors
• Absence of a Proximity Effect in a Topological Insulator on a Cuprate Superconductor: Bi2Se3/Bi2Sr2CaCu2O8
• Search for superconducting proximity effect in a topological insulator and high temperature superconductor heterostructure Bi2Se3/Bi2Sr2CaCu2O8+
• Studies on the origin of the interfacial superconductivity of Sb2Te3/Fe1+yTe heterostructures
• Superconducting proximity effect in a topological insulator using Fe(Te,Se)
• Realizing Majorana Zero Modes by Proximity Effect between Topological Insulators and d-wave High-Temperature Superconductors
• Hybrid symmetry epitaxy of superconducting Fe(Te,Se) film on a topological insulator
• Twofold symmetry of proximity-induced superconductivity in Bi${}_2$Te${}_3$/Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ heterostructures revealed by scanning tunneling microscopy
• Proximity induced time-reversal topological superconductivity in Bi2Se3 films without phase tuning
• Controversy over large proximity induced s wave like pairing from a d wave superconductor
• Inverse proximity effect in $s$-wave and $d$-wave superconductors coupled to topological insulators
• Fulde-Ferrell States in Inverse Proximity Coupled Magnetically-Doped Topological Heterostructures
• Rotational symmetry breaking and partial Majorana corner states in a high-Tc superconductor based heterostructure
• Comment on "Nonmagnetic Impurity Resonances as a Signature of Sign-Reversal Pairing in Fe-As-Based Superconductors"
• Proximity effect in a heterostructure of a high $T_c$ superconductor with a topological insulator from Dynamical mean field theory

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