Superconductivity in CuxBi2Se3 and its implications for pairing in the undoped topological insulator

Abstract

Bi2Se3 is one of a handful of known topological insulators. Here we show that copper intercalation in the van der Waals gaps between the Bi2Se3 layers, yielding an electron concentration of ~ 2 x 10^20cm-3, results in superconductivity at 3.8 K in CuxBi2Se3 for x between 0.12 and 0.15. This demonstrates that Cooper pairing is possible in Bi2Se3 at accessible temperatures, with implications for study of the physics of topological insulators and potential devices.

6 pages, 4 figures

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• Observation of coexisting weak localization and superconducting fluctuations in strained Sn1-xInxTe thin films
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• Topologically nontrivial electronic states in CaSn${}_3$
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• Chiral symmetries and Majorana fermions in coupled magnetic atomic chains on a superconductor
• Nematic superconductivity in Cu${}_x$Bi${}_2$Se${}_3$: The surface Andreev bound states
• Surface states and local spin susceptibility in doped three-dimensional topological insulators with odd-parity superconducting pairing symmetry
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• 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
• Bulk Fermi surface and electronic properties of Cu${}_{0.07}$Bi${}_2$Se${}_3$
• Majorana multipole response: General theory and application to wallpaper groups
• Superconducting Sn_{1-x}In_{x}Te Nanoplates
• Nematic superconductivity in the topological semimetal CaSn${}_3$
• Pressure-induced superconductivity in weak topological insulator BiSe
• Andreev spectroscopy of doped HgTe quantum wells
• Pressure-induced superconductivity in the three-dimensional Dirac semimetal Cd3As2
• Topological Larkin-Ovchinnikov phase and Majorana zero mode chain in bilayer superconducting topological insulator films
• $\require{mhchem}$Misfit phase $\ce{(BiSe)_{$1.10$}NbSe2}$ as the origin of superconductivity in nobium-doped bismuth selenide
• Chemical Principles of Intrinsic Topological Superconductors
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• Magnetic Response of Majorana Kramers Pairs Protected by Z2 Invariants
• Magnetic response of Majorana Kramers pairs with an order-two symmetry
• Internal pressure in superconducting Cu intercalated Bi${}_2$Se${}_3$
• Effect of Sr doping on structure, morphology and transport properties of Bi${}_2$Se${}_3$ epitaxial thin films
• Antichiral and nematicity-wave superconductivity
• Quasiparticle on Bogoliubov Fermi Surface and Odd-Frequency Cooper Pair
• Field-angle-dependent low-energy excitations around a vortex in the superconducting topological insulator CuxBi2Se3
• Tailoring phase transition from topological superconductor to trivial superconductor induced by magnetic textures of a spin-chain on a $p$-wave superconductor
• Strong-Coupling Superconductivity with $T_c$ $\sim$ 10.8 K Induced by P Doping in the Topological Semimetal Mo${}_5$Si${}_3$
• Pressure-Induced Large Volume Collapse, Plane-to-Chain, Insulator to Metal Transition in CaMn${}_2$Bi${}_2$
• Stability of Disordered Topological Superconducting Phases in Magnet--Superconductor Hybrid Systems
• Symmetry of superconducting pairing in non-pseudospin electron bands
• Low coverage surface diffusion in complex energy landscapes: Analytical solution and application to intercalation in topological insulators
• The effect of interorbital scattering on superconductivity in doped Dirac materials
• Crystal structure and distortion of superconducting Cu${}_x$Bi${}_2$Se${}_3$
• Pressure-induced multiple phase transformations of the BaBi${}_3$ superconductor
• Superconductivity in an organometallic compound
• Superconducting phase diagram and nontrivial band topology of structurally modulated Sn${}_{1-x}$Sb${}_x$
• Observation of the topological Dirac fermions and surface states in superconducting BaSn3
• Topological quantum phase transitions and edge states in spin-orbital coupled Fermi gases
• Effective low energy theory for surface Andreev bound states of superconducting phases in generalized Bernevig-Hughes-Zhang models
• Superconducting four-fold Fe(Te,Se) film on six-fold magnetic MnTe via hybrid symmetry epitaxy
• Fermiology of possible topological superconductor Tl0.5Bi2Te3 derived from hole-doped topological insulator
• Green function theory of dirty two-band superconductivity
• Impurity effects in a two-dimensional topological superconductor: A link of Tc-robustness with a topological number
• Magnetic response of nematic superconductors: skyrmion stripes and their signatures in muon spin relaxation experiments
• Quasi-2D Fermi surface of superconducting line-nodal metal CaSb${}_2$
• Disorder effects on thermal transport on the surface of topological superconductors by the self-consistent Born approximation
• Dual topological superconducting states in the layered titanium-based oxypnictide superconductor BaTi${}_2$Sb${}_2$O
• Superconducting-contact-induced resistance-anomalies in the 3D topological insulator Bi2Te3
• Unconventional pressure dependence of the superfluid density in the nodeless topological superconductor $\alpha$-PdBi${}_2$
• Superconductivity in the nodal-line compound La${}_3$Pt${}_3$Bi${}_4$
• Sea of Majorana fermions from pseudo-scalar superconducting order in three dimensional Dirac materials
• The Vertical Position of Sr Dopants in the Sr${}_x$Bi${}_2$Se${}_3$ Superconductor
• Symmetries, Length Scales, Magnetic Response and Skyrmion Chains in Nematic Superconductors
• Observation of spin-polarized surface states in a nodal line semimetal SnTaS${}_2$
• Low-temperature environments for quantum computation and quantum simulation
• Topological superconductivity on the honeycomb lattice: Effect of normal state topology
• Spin-Nernst Effect in Time-Reversal-Invariant Topological Superconductors
• Superconducting Bi2Te: pressure-induced universality in the (Bi2)m(Bi2Te3)n series
• Wiedemann-Franz-type relation between shot noise and thermal conduction of Majorana surface states in a three-dimensional topological superconductor
• Reproducible synthetic method for the topological superconductor CuxBi2Se3
• Chiral Gravitomagnetic Effect in Topological Superconductors and Superfluids
• Nodeless superconductivity in the topological nodal-line semimetal CaSb2
• Electric Multipoles of Double Majorana Kramers Pairs
• La1-xBi1+xS3 (x~0.08): An n-Type Semiconductor
• Visualizing the $d$-vector in a nematic triplet superconductor
• Scanning tunneling microscopy of superconducting topological surface states in Bi${}_2$Se${}_3$
• Edge superconducting state in attractive U Kane-Mele-Hubbard model
• Superconductivity in Cu-doped Bi${}_2$Se${}_3$ with potential disorder
• Emergence of intrinsic superconductivity below 1.178 K in the topologically non-trivial semimetal state of CaSn3
• Observability of superconductivity in Sr-doped Bi2Se3 at the surface using scanning tunneling microscope
• Possible Lattice and Charge Order in CuxBi2Te2Se
• Converting topological insulators into topological metals within the tetradymite family
• Detailed magneto-heat capacity analysis of SnAs topological superconductor
• Evidence for conventional superconductivity in Sr0.1Bi2Se3 from high pressure studies
• Magnetic tilting and emergent Majorana spin connection in topological superconductors
• Bulk Superconductivity in the Dirac Semimetal TlSb
• Fully-gapped superconductivity and topological aspects of the noncentrosymmetric TaReSi superconductor
• Quasiparticle interference in doped topological insulators with nematic superconductivity
• Unusual upper critical fields of the topological nodal-line semimetal candidate Sn${}_x$NbSe${}_{2-\delta }$
• An increase in $T_c$ under hydrostatic pressure in the superconducting doped topological insulator Nb${}_{0.25}$Bi${}_2$Se${}_3$
• Impurity Effects on Superconductivity on Surfaces of Topological Insulators
• Superconducting properties of Cu intercalated Bi${}_2$Se${}_3$ studied by Muon Spin Spectroscopy
• Multi-layered chalcogenides with potential for magnetism and superconductivity
• Full superconducting gap in the candidate topological superconductor In${}_{1-x}$Pb${}_x$Te for x = 0.2
• Local moment formation and magnetic coupling of Mn guest atoms in Bi${}_2$Se${}_3$: a low-temperature ferromagnetic resonance study
• Enhanced nonlinear Hall effect by Cooper pairs near superconductor criticality
• Superconductivity and weak anti-localization in nodal-line semimetal SnTaS_2
• NMR in an electric field: A bulk probe of the hidden spin and orbital polarizations
• Bi Substitution Effects on Superconductivity of Valence-Skip superconductor AgSnSe2
• Experimental and first-principles studies of superconductivity in topological nodal line semimetal SnTaS${}_2$
• Triplet superconductivity in 3D Dirac semimetal due to exchange interaction
• Metal-insulator-like transition, superconducting dome and topological electronic structure in Ga-doped Re${}_3$Ge${}_7$
• Scanning tunneling spectroscopy investigations of superconducting-doped topological insulators: Experimental pitfalls and results
• Specific Heat and Electrical Transport Properties of Sn0.8Ag0.2Te Superconductor
• Anisotropic Upper Critical Field, Seebeck and Nernst Coefficient in Nb0.20Bi2Se3 Topological Superconductor
• Tip-induced Superconductivity
• Nuclear magnetic relaxation rates of unconventional superconductivity in doped topological insulators
• Quasi-localized Impurity State in Doped Topological Crystalline Insulator Sn${}_{0.9}$In${}_{0.1}$Te Probed by ${}^{125}$Te-NMR
• Topological superconductivity in an ultrathin, magnetically-doped topological insulator proximity coupled to a conventional superconductor
• Bulk superconductivity in Pb-substituted BiS${}_2$-based compounds studied by hard-x-ray spectroscopy
• Elementary models of 3D topological insulators with chiral symmetry
• Low-Energy Surface States in the Normal State of $\alpha$-PdBi2 Superconductor
• From classical to quantum regime of topological surface states via defect engineering
• Effect of gallium doping on structural and transport properties of the topological insulator Bi2Se3 grown by molecular beam epitaxy
• Erasable superconductivity in topological insulator Bi2Se3 induced by voltage pulse
• In-situ topotactic chemical reaction for spectroscopies
• Mystery of superconductivity in FeTe films and the role of neighboring layers
• Pauli paramagnetism of triplet Cooper pairs in a nematic superconductor
• Inverse coherence effects in nuclear magnetic relaxation rates as a sign of topological superconductivity
• Electronic Transport Studies of Ag-doped Bi2Se3 Topological Insulator
• Strong electron-phonon coupling in 3D tungsten nitride and coexistence of intrinsic superconductivity and topological nodal line in its 2D limit
• Charge-impurity-induced Majorana fermions in topological superconductors
• Magnification of signatures of topological phase transition by quantum zero point motion
• Low-energy phonons and superconductivity in Sn${}_{0.8}$In${}_{0.2}$Te
• Anisotropic multiband superconductivity in 2M-WS${}_2$ probed by controlled disorder
• Physical properties of $R$Bi${}_2$ ($R=$La, Ce) under pressure
• The vortex core excitation spectrum in gapped topological d-wave superconductors
• Orbital Selectivity and Magnetic Ordering in Fe intercalated Dirac Semimetal Bi${}_2$Se${}_3$
• Majorana states in a p-wave superconducting ring
• Visualizing Pairing Symmetry in Nematic Superconductors using spin-polarized spectroscopy of magnetic impurities
• Superconductivity induced by Ag intercalation in Dirac semimetal Bi${}_2$Se${}_3$
• Introduction of Sr into Bi2Se3 thin films by molecular beam epitaxy
• Superconductive proximity in a Topological Insulator slab and excitations bound to an axial vortex
• Investigation of superconducting properties and possible nematic superconductivity in self-doped BiCh2-based superconductor CeOBiS1.7Se0.3
• Low-temperature thermal expansion of the topological material candidates $\beta$-PtBi${}_2$ and $\beta$-Bi${}_2$Pd
• Surface Spectral Function of Momentum-dependent Pairing Potentials in a Topological Insulator: Application to Cu${}_x$Bi${}_2$Se${}_3$
• Topological properties of finite-size heterostructures of magnetic topological insulators and superconductors
• Crystal Chemistry at High Pressure
• Signatures of surface Majorana modes in the magnetic response of topological superconductors
• Helical Topological Superconducting Pairing at Finite Excitation Energies
• 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
• Excited-state dynamics of structurally characterized crystal of SnxSb1-x
• Vortex Core Structure in Multilayered Rashba Superconductors
• Photoemission Spectroscopic Evidence of Multiple Dirac Cones in Superconducting BaSn${}_3$
• Theory of tunneling spectroscopy in a superconducting topological insulator
• Sn${}_{0.06}$Cr${}_3$Te${}_4$: A Skyrmion Superconductor
• Effects of disorder on the quantum transport properties in topologically nontrivial metal PbTaSe${}_2$
• Evidence of unconventional pairing in the quasi two-dimensional CuIr${}_2$Te${}_4$ superconductor
• Atomic-scale tailoring of spin susceptibility via non-magnetic spin-orbit impurities
• Formation of tungsten carbide by focused ion beam process: A route to high magnetic field resilient patterned superconducting nanostructures
• Spontaneous Lattice Distortion in the Spin-Triplet Superconductor Cu${}_x$Bi${}_2$Se${}_3$
• Rotating Majorana Zero Modes in a disk geometry
• Multigap Superconductivity in the Filled-Skutterudite Compound LaRu${}_4$As${}_{12}$ probed by muon spin rotation
• Sn2Pd: a possible superconducting material with topological surface states
• High-pressure synthesis and superconducting properties of NaCl-type In1-xPbxTe (x = 0-0.8)
• Anomalous Shiba spectrum and superconductivity induced magnetic interactions in materials with topological band inversion
• Possible two-component pairings in electron-doped Bi${}_2$Se${}_3$ based on a tight-binding model
• Superconducting and normal-state anisotropy of the doped topological insulator Sr${}_{0.1}$Bi${}_2$Se${}_3$
• Pyridine intercalated Bi${}_2$Se${}_3$ heterostructures: controlling the topologically protected states
• Chiral universality class of the normal-superconducting and the exciton condensation transition on the surface of topological insulator
• Fermi Surface Topology and Magneto-transport Properties of Superconducting Pd${}_3$Bi${}_2$Se${}_2$
• Nodeless superconductivity and topological nodal states in molybdenum carbide
• Majorana edge states and topological properties in 1D/2D Rashba semiconductor proximity coupled to iron-based superconductor
• Anomalous Josephson Hall effect in doped topological insulators with the nematic superconductivity
• Unconventional superconductivity from electronic dipole fluctuations
• Anomalous behavior of the $E_u^1$ infrared-active phonon mode in a Bi${}_{2-x}$Sr${}_x$Se${}_3$ crystal
• Electronic structures and stability investigation of the new class of large band gap topological insulators MTl${}_4$Te${}_3$ (M = Cd, Hg)
• 3D Non-Abelian Anyons: Degeneracy Splitting and Detection by Adiabatic Cooling
• Surface chiral superconductivity in odd-parity nematic superconductors with magnetic impurities
• Resolving phonon-mediated superconducting pairing symmetries from first-principles calculation
• Anomalous 140 K electronic transition in Bi${}_2$Se${}_3$: Possible charge order in a defect-engineered system
• Pairing around a Single Dirac Point: A Unifying View of Kohn-Luttinger Superconductivity in Chern Bands, Quarter Metals, and Topological Surface States
• Orbital homology of p and t2g orbitals in models and materials
• Theory of Topological Superconductivity in Doped IV-VI Semiconductors
• Introduction to High-Temperature Superconductivity for Solid State Chemists
• Possible Topological Superconductivity in a Topological Crystalline Insulator (Pb${}_{1-x}$Sn${}_x$)${}_{1-y}$In${}_y$Te
• Surface states around a vortex in topological superconductors: Intersection of a surface and a vortex
• Pressure-induced superconductivity and topological quantum phase transitions in a quasi-one-dimensional topological insulator: Bi4I4
• Non-Trivial Topological Phase in the Sn_{1-x}In_xTe Superconductor
• Electronic correlations in magnetized helical edge states coupled to s-wave superconductors
• Sensitivity of superconducting states to the impurity location in layered materials
• Proximity-Induced Superconductivity in a Topological Crystalline Insulator
• Single-gap Isotropic $s-$wave Superconductivity in Single Crystals ${\text{AuSn}}_4$
• Topological Surface States and Superconductivity in [Tl${}_4$](Tl${}_{1-x}$Sn${}_x$)Te${}_3$ Perovskites
• Self-regulated growth of candidate topological superconducting parkerite by molecular beam epitaxy
• Theory of low-energy behaviors in topological $s$-wave pairing superconductors
• Pressure induced superconductivity bordering a charge-density-wave state in NbTe4 with strong spinorbit coupling
• Magnetic impurities make superconductivity in 3D Dirac semi-metal triplet