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

Abstract

We observe proximity-induced superconductivity in the \textit{in situ} prepared heterostructures constructed by topological insulator Bi${}_2$Te${}_3$ thin films and high-temperature cuprate superconductors Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$. The superconducting gap maximum is about 7.6 meV on the surface of Bi${}_2$Te${}_3$ thin films with a thickness of two quintuple layers, and the gap value decreases with an increase in the film thickness. Moreover, the quasiparticle interference data show a clear evidence of a twofold symmetric superconducting gap with gap minima along one pair of the principal crystalline axes of Bi${}_2$Te${}_3$. This gap form is consistent with the ${\Delta }_{4y}$ notation of the topological superconductivity proposed in such systems. Our results provide fruitful information of the possible topological superconductivity induced by the proximity effect in high-temperature superconducting cuprates.

arXiv comment6 pages, 4 figures

References in corpus (49)

• Topological insulators and superconductors
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Unpaired Majorana fermions in quantum wires
• Paired states of fermions in two dimensions with breaking of parity and time-reversal symmetries, and the fractional quantum Hall effect
• Superconductivity in CuxBi2Se3 and its implications for pairing in the undoped topological insulator
• Discovery of microscopic electronic inhomogeneity in the high-Tc superconductor Bi2Sr2CaCu2O8+x
• Odd-Parity Topological Superconductors: Theory and Application to Cu${}_x$Bi${}_2$Se${}_3$
• Hexagonal Warping Effects in the Surface States of Topological Insulator Bi${}_2$Te${}_3$
• Evidence for Majorana bound state in an iron-based superconductor
• Experimental demonstration of the topological surface states protected by the time-reversal symmetry
• Observation of topological superconductivity on the surface of an iron-based superconductor
• Topological Crystalline Insulators and Topological Superconductors: From Concepts to Materials
• Topological Superconductivity in CuxBi2Se3
• Majorana mode in vortex core of Bi2Te3/NbSe2 topological insulator-superconductor heterostructure
• The Coexistence of Superconductivity and Topological Order in the Bi2Se3 Thin Films
• STM imaging of electronic waves on the surface of Bi${}_2$Te${}_3$: topologically protected surface states and hexagonal warping effects
• Observation of topological order in a Superconducting doped topological insulator (based on the Bi2Se3 class)
• Spin-Rotation Symmetry Breaking in the Superconducting State of CuxBi2Se3
• Topological nature of FeSe${}_{0.5}$Te${}_{0.5}$ superconductor
• Zero-energy vortex bound state in the superconducting topological surface state of Fe(Se,Te)
• Topological Superconductor Bi2Te3/NbSe2 heterostructures
• Topological superconductivity on the surface of Fe-based superconductors
• Thermodynamic evidence for nematic superconductivity in Cu${}_x$Bi${}_2$Se${}_3$
• Superconductivity with topological surface state in SrxBi2Se3
• Odd-parity topological superconductor with nematic order: Application to CuxBi2Se3
• Robust and clean Majorana zero mode in the vortex core of high-temperature superconductor (Li0.84Fe0.16)OHFeSe
• Local Measurements of the Superconducting Pairing Symmetry in CuxBi2Se3
• Spectroscopic scanning tunneling microscopy insights into Fe-based superconductors
• Proximity-induced high-temperature superconductivity in topological insulators Bi2Se3 and Bi2Te3
• Anisotropic Energy Gaps of Iron-based Superconductivity from Intra-band Quasiparticle Interference in LiFeAs
• Fully gapped topological surface states in Bi${}_2$Se${}_3$ films induced by a d-wave high-temperature superconductor
• Majorana Fermions and Exotic Surface Andreev Bound States in Topological Superconductors: Application to CuxBi2Se3
• Topological Characters in Fe(Te${}_{1-x}$Se${}_x$) thin films
• Imaging the impact on cuprate superconductivity of varying the inter-atomic distances within individual crystal unit-cells
• Quasiparticle scattering in two dimensional helical liquid
• Quasiparticle Interference on the Surface of the Topological Insulator Bi${}_2$Te${}_3$
• Evolution of the fermi surface of a doped topological insulator with carrier concentration
• Scrutinizing the double superconducting gaps and strong coupling pairing in (Li1-xFexOH)FeSe
• Topological Phases in the Single-Layer FeSe
• Superconductivity with two-fold symmetry in topological superconductor SrxBi2Se3
• Drive the Dirac Electrons into Cooper Pairs in SrxBi2Se3
• Time reversal symmetry breaking superconductivity in topological materials
• Absence of a Proximity Effect in a Topological Insulator on a Cuprate Superconductor: Bi2Se3/Bi2Sr2CaCu2O8
• Quasi-particle evidence for the nematic state above $T_{\mathrm{c}}$ in Sr${}_x$Bi${}_2$Se${}_3$
• Search for superconducting proximity effect in a topological insulator and high temperature superconductor heterostructure Bi2Se3/Bi2Sr2CaCu2O8+
• Directly visualizing the sign change of d-wave superconducting gap in Bi2Sr2CaCu2O8+δ by phase-referenced quasiparticle interference
• 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
• Controversy over large proximity induced s wave like pairing from a d wave superconductor

Cited by in corpus (11)

• Twofold symmetry of $c$-axis resistivity in topological kagome superconductor CsV${}_3$Sb${}_5$ with in-plane rotating magnetic field
• Hybrid symmetry epitaxy of superconducting Fe(Te,Se) film on a topological insulator
• Rotational symmetry breaking and partial Majorana corner states in a high-Tc superconductor based heterostructure
• Superconducting four-fold Fe(Te,Se) film on six-fold magnetic MnTe via hybrid symmetry epitaxy
• Coulomb Blockade Effects in a Topological Insulator Grown on a High-Tc Cuprate Superconductor
• Origin of Suppression of Proximity Induced Superconductivity in Bi/Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ Heterostructure
• Resilient Growth of Highly Crystalline Topological Insulator-Superconductor Heterostructure Enabled by Ex-situ Nitride Film
• Superconductivity and vortex structure on Bi${}_2$Te${}_3$/FeTe${}_{0.55}$Se${}_{0.45}$ heterostructures with different thickness of Bi${}_2$Te${}_3$ films
• Proximity effect and inverse proximity effect in a topological-insulator/iron-based-superconductor heterostructure
• Resistive anisotropy in the charge density wave phase of Kagome superconductor CsV3Sb5 thin films
• Corner Flat Bands Induced by $d$-Density Wave and Partial Corner State Modification Due to Competition with $d$-Wave Superconductivity