Topological Superconductivity in CuxBi2Se3

Abstract

A topological superconductor (TSC) is characterized by the topologically-protected gapless surface state that is essentially an Andreev bound state consisting of Majorana fermions. While a TSC has not yet been discovered, the doped topological insulator CuxBi2Se3, which superconducts below ~3 K, has been predicted to possess a topological superconducting state. We report that the point-contact spectra on the cleaved surface of superconducting CuxBi2Se3 present a zero-bias conductance peak (ZBCP) which signifies unconventional superconductivity. Theoretical considerations of all possible superconducting states help us conclude that this ZBCP is due to Majorana Fermions and gives evidence for a topological superconductivity in CuxBi2Se3. In addition, we found an unusual pseudogap that develops below ~20 K and coexists with the topological superconducting state.

5 pages, 4 figures (paper proper) + 10 pages, 10 figures (supplemental material); final version accepted for publication in PRL

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• Nodeless superconductivity in the charge density wave superconductor LaPt${}_2$Si${}_2$
• Unusual upper critical fields of the topological nodal-line semimetal candidate Sn${}_x$NbSe${}_{2-\delta }$
• Tunneling conductance in superconducting junctions with $p$-wave unconventional magnets breaking time-reversal symmetry
• Control of Edge Currents at a Ferromagnet - Triplet Superconductor Interface by Multiple Helical Majorana Modes
• Superconducting properties of Cu intercalated Bi${}_2$Se${}_3$ studied by Muon Spin Spectroscopy
• Protected gap closing in Josephson junctions constructed on Bi${}_2$Te${}_3$ surface
• Quasiparticle states and quantum interference induce by magnetic impurities on a two-dimensional topological superconductor
• Detailed magneto-heat capacity analysis of SnAs topological superconductor
• Magnetic tilting and emergent Majorana spin connection in topological superconductors
• Molecular beam epitaxy of superconducting Sn${}_{1-x}$In${}_x$Te thin films
• Bulk Superconductivity in the Dirac Semimetal TlSb
• Hybridization mechanism of the dual proximity effect in superconductor-topological insulator interfaces
• Yu-Shiba-Rusinov states in a superconductor with topological Z2 bands
• Nuclear magnetic relaxation rates of unconventional superconductivity in doped topological insulators
• Specific Heat and Electrical Transport Properties of Sn0.8Ag0.2Te Superconductor
• Interface currents and magnetization in singlet-triplet superconducting heterostructures: Role of chiral and helical domains
• Bi Substitution Effects on Superconductivity of Valence-Skip superconductor AgSnSe2
• Scanning tunneling spectroscopy investigations of superconducting-doped topological insulators: Experimental pitfalls and results
• Experimental and first-principles studies of superconductivity in topological nodal line semimetal SnTaS${}_2$
• Fermiology of a topological line-nodal compound CaSb2 and its implication to superconductivity: angle-resolved photoemission study
• Chemically gated electronic structure of a superconducting doped topological insulator system
• Chiral topological superconducting state with Chern number $\mathcal{C}=-2$ in Pb${}_3$Bi/Ge(111)
• Tip-induced Superconductivity
• Anisotropic Upper Critical Field, Seebeck and Nernst Coefficient in Nb0.20Bi2Se3 Topological Superconductor
• Pauli paramagnetism of triplet Cooper pairs in a nematic superconductor
• Magnification of signatures of topological phase transition by quantum zero point motion
• Low-Energy Surface States in the Normal State of $\alpha$-PdBi2 Superconductor
• Topological quantum phase transitions in the spin-singlet superconductor with Rashba and Dresselhaus (110) spin-orbit couplings
• Inverse coherence effects in nuclear magnetic relaxation rates as a sign of topological superconductivity
• Erasable superconductivity in topological insulator Bi2Se3 induced by voltage pulse
• Low-energy phonons and superconductivity in Sn${}_{0.8}$In${}_{0.2}$Te
• Controllable enhancement of $p$-wave superconductivity via magnetic coupling to a conventional superconductor
• Triplet $p$-wave pairing correlation in low doped zigzag graphene nanoribbons
• Charge-impurity-induced Majorana fermions in topological superconductors
• Fully gapped superconductivity without sign reversal in the topological superconductor PbTaSe${}_2$
• Majorana fermions in semiconductor nanostructures with two wires connected through ring
• Visualizing Pairing Symmetry in Nematic Superconductors using spin-polarized spectroscopy of magnetic impurities
• Odd-frequency pairs and anomalous proximity effect in nematic and chiral states of superconducting topological insulators
• Surface Spectral Function of Momentum-dependent Pairing Potentials in a Topological Insulator: Application to Cu${}_x$Bi${}_2$Se${}_3$
• Three-dimensional time reversal invariant topological superconductivity in doped chiral topological semimetals
• Orbital Selectivity and Magnetic Ordering in Fe intercalated Dirac Semimetal Bi${}_2$Se${}_3$
• Enhanced zero-bias conductance peak and splitting at mesoscopic interfaces between an $s$-wave superconductor and a 3D Dirac semimetal
• Introduction of Sr into Bi2Se3 thin films by molecular beam epitaxy
• Double Majorana Vortex Flat Bands in the Topological Dirac Superconductor
• Visualization of Unconventional Rashba Band and Vortex Zero Mode in Topopogical Superconductor Candidate AuSn${}_4$
• Representation-protected topology of spin-singlet $s$-wave superconductors
• Andreev Reflection without Fermi surface alignment in High T${}_c$-Topological heterostructures
• Relaxation of the entanglement spectrum in quench dynamics of topological systems
• Exotic quantum statistics and thermodynamics from a number-conserving theory of Majorana fermions
• Signatures of surface Majorana modes in the magnetic response of topological superconductors
• Complex-band-structure eigenvalue method adapted to Floquet systems: topological superconducting wires as a case study
• How spectrum-wide quantum criticality protects surface states of topological superconductors from Anderson localization: Quantum Hall plateau transitions (almost) all the way down
• Quantum Anomalous Hall Effect in Three-dimensional Topological Insulator/Thin-film Ferromagnetic Metal Bilayer Structure
• Photoemission Spectroscopic Evidence of Multiple Dirac Cones in Superconducting BaSn${}_3$
• Spin-resolved nonlocal transport in proximitized Rashba nanowires
• Majorana Fermions Under Uniaxial Stress in Semiconductor-Superconductor Heterostructures
• Evidence of unconventional pairing in the quasi two-dimensional CuIr${}_2$Te${}_4$ superconductor
• High-pressure synthesis and superconducting properties of NaCl-type In1-xPbxTe (x = 0-0.8)
• Phase diagrams of superconducting topological surface states
• Majorana edge states and topological properties in 1D/2D Rashba semiconductor proximity coupled to iron-based superconductor
• Possible two-component pairings in electron-doped Bi${}_2$Se${}_3$ based on a tight-binding model
• Theory of tunneling spectroscopy in a superconducting topological insulator
• Rotating Majorana Zero Modes in a disk geometry
• Nodeless superconductivity and topological nodal states in molybdenum carbide
• Nonadiabatic braiding of Majorana modes
• Sn2Pd: a possible superconducting material with topological surface states
• Anomalous Josephson Hall effect in doped topological insulators with the nematic superconductivity
• Surface chiral superconductivity in odd-parity nematic superconductors with magnetic impurities
• Theory of Topological Superconductivity in Doped IV-VI Semiconductors
• Inversion-symmetric Electron Gases as New Platforms for Topological Planar Josephson Junctions
• Measuring the Spin Polarization of a Ferromagnet: an Application of Time-Reversal Invariant Topological Superconductor
• Surface states around a vortex in topological superconductors: Intersection of a surface and a vortex
• Resolving phonon-mediated superconducting pairing symmetries from first-principles calculation
• Large gap, a pseudogap and proximity effect in the Bi2Te3/Fe1+yTe interfacial superconductor
• Broken time-reversal symmetry detected by tunneling spectroscopy of superconducting Pd-doped CaAgP
• SnAs: a 4K weak type-II superconductor with non-trivial band topology
• Giant and robust Josephson diode effect in multiband topological nanowires
• Systematic study for two-dimensional $Z_2$ topological phase transitions at high-symmetry points in all layer groups
• Binary kagome superconducting candidates hosting topological electronic states
• Theory of low-energy behaviors in topological $s$-wave pairing superconductors
• Chiral $p-$wave superconductivity in Pb${}_{1-x}$Sn${}_x$Te: signatures from bound-state spectra and wavefunctions