Realizing Majorana Zero Modes by Proximity Effect between Topological Insulators and d-wave High-Temperature Superconductors

Abstract

We theoretically study superconducting proximity effect between a topological insulator (TI) and a high-temperature d-wave superconductor (dSC). When the TI-dSC heterostructure violates 90 degree-rotation and certain reflection symmetries, we show that a sizable s-wave pairing, coexisting with a d-wave one, emerges in the proximity-induced superconductivity in the TI's top surface states. Weak disorder further suppresses d-wave pairing but not s-wave one in the TI's surface states. More importantly, the pairing gap in surface states is found to be nodeless and nearly-isotropic when the Fermi pocket of surface states is relatively small. Our theoretical results qualitatively explain recent experimental evidences of a nearly-isotropic pairing gap on surface states of Bi_2Se_3 induced by proximity with high-T_c cuprate Bi_2Ca_2Cu_2O_{8+δ}. We also demonstrate convincing evidences of Majorana zero modes in a magnetic hc/2e vortex core, which may be detectable in future experiments.

4.5 pages, 4 figures

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Cited by in corpus (23)

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• Anomalous Josephson effect in d-wave superconductor junctions on TI surface
• Topological $s$-wave superconductors driven by electron correlation
• 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
• Controversy over large proximity induced s wave like pairing from a d wave superconductor
• Rotational symmetry breaking and partial Majorana corner states in a high-Tc superconductor based heterostructure
• Origin of Suppression of Proximity Induced Superconductivity in Bi/Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ Heterostructure
• High critical temperature nodal superconductors as building block for time-reversal invariant topological superconductivity
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• Topological Phases in Nodeless Tetragonal Superconductors
• Majorana bound states in d-wave superconductor planar Josephson junction
• Detecting competing orders through the edge states in the heterostructures with high-Tc superconductors
• Proximity effect in a heterostructure of a high $T_c$ superconductor with a topological insulator from Dynamical mean field theory
• Proximity effect and inverse proximity effect in a topological-insulator/iron-based-superconductor heterostructure
• Andreev Reflection without Fermi surface alignment in High T${}_c$-Topological heterostructures
• Angular momentum of vortex-core Majorana zero modes
• Robust quantized thermal conductance of Majorana floating edge bands in d-wave superconductors
• Electrical probe of spin-spiral order in quantum spin Hall/spin-spiral magnet van der Waals heterostructures
• Superconducting PdTe Thin Film Via Topotactic Transformation, Toward Topological Superconductors