Atomic diffusion-induced polarization and superconductivity in topological insulator-based heterostructures

Abstract

The proximity effect at a highly transparent interface of an s-wave superconductor (S) and a topological insulator (TI) provides a promising platform to create Majorana zero modes in artificially designed heterostructures. However, structural and chemical issues pertinent to such interfaces are poorly explored so far. Here, we report the discovery of Pd diffusion induced polarization at interfaces between superconductive Pd${}_{1+x}$(Bi${}_{0.4}$Te${}_{0.6}$)${}_2$ (xPBT, $0\le x\le 1$) and Pd-intercalated Bi${}_2$Te${}_3$ by using atomic-resolution scanning transmission electron microscopy. Our quantitative image analysis reveals that nanoscale lattice strain and QL polarity synergistically suppress and promote the Pd diffusion at the normal and parallel interfaces, formed between Te-Pd-Bi triple layers (TLs) and Te-Bi-Te-Bi-Te quintuple layers (QLs), respectively. Further, our first-principles calculations unveil that the superconductivity of xPBT phase and topological nature of Pd-intercalated Bi${}_2$Te${}_3$ phase are robust against the broken inversion symmetry. These findings point out the necessity of considering coexistence of electric polarization with superconductivity and topology in such S-TI systems.

References in corpus (37)

• Topological insulators and superconductors
• Fault-tolerant quantum computation by anyons
• Non-Abelian Anyons and Topological Quantum Computation
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
• Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
• Paired states of fermions in two dimensions with breaking of parity and time-reversal symmetries, and the fractional quantum Hall effect
• New directions in the pursuit of Majorana fermions in solid state systems
• Observation of Majorana Fermions in Ferromagnetic Atomic Chains on a Superconductor
• Non-Abelian statistics and topological quantum information processing in 1D wire networks
• Majorana Zero Modes and Topological Quantum Computation
• Evidence for Majorana bound state in an iron-based superconductor
• Chiral Topological Superconductor From the Quantum Hall State
• Materials Cloud, a platform for open computational science
• Ambipolar Field Effect in Topological Insulator Nanoplates of (BixSb1-x)2Te3
• Topological Quantum Computation Based on Chiral Majorana Fermions
• AiiDA 1.0, a scalable computational infrastructure for automated reproducible workflows and data provenance
• First Principles Investigations of the Atomic, Electronic, and Thermoelectric Properties of Equilibrium and Strained Bi2Se3 & Bi2Te3, with van der Waals Interactions
• Signature of a pair of Majorana zero modes in superconducting gold surface states
• Superconductivity and non-metallicity induced by doping the topological insulators Bi2Se3 and Bi2Te3
• Experimental verification of PbBi${}_2$Te${}_4$ as a 3D topological insulator
• Ordered and tunable Majorana-zero-mode lattice in naturally strained LiFeAs
• Effects of van der Waals interactions and quasiparticle corrections on the electronic and transport properties of Bi2Te3
• Topological insulators vs. topological Dirac semimetals in honeycomb compounds
• Type-I superconductivity in PdTe${}_2$ probed by $\mu$SR
• Proximity-induced superconductivity in (Bi${}_{1-x}$Sb${}_x$)${}_2$Te${}_3$ topological-insulator nanowires
• Novel self-epitaxy for inducing superconductivity in the topological insulator (Bi1-xSbx)2Te3
• PdTe a 4.5K Type II BCS Superconductor
• Enhanced Superconductivity in the Se-substituted 1T-PdTe${}_2$
• Evidence for singular-phonon-induced nematic superconductivity in a topological superconductor candidate Sr${}_{0.1}$Bi${}_2$Se${}_3$
• Mixed type I and type II superconductivity due to intrinsic electronic inhomogeneities in the type II Dirac semimetal PdTe2
• Density functional Bogoliubov-de Gennes analysis of superconducting Nb and Nb(110) surfaces
• Penetration depth study of the type-I superconductor PdTe2
• The AiiDA-KKR plugin and its application to high-throughput impurity embedding into a topological insulator
• Chemical Migration and Dipole Formation at van der Waals Interfaces between Magnetic Transition Metal Chalcogenides and Topological Insulators
• Enhanced, homogeneous type II superconductivity in Cu-intercalated PdTe${}_2$
• Proximity induced superconductivity in a topological insulator

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