Unconventional Superconductivity at Mesoscopic Point-contacts on the 3-Dimensional Dirac Semi-metal Cd${}_3$As${}_2$

Abstract

Since the three dimensional (3D) Dirac semi-metal Cd${}_3$As${}_2$ exists close to topological phase boundaries, in principle it should be possible to drive it into exotic new phases, like topological superconductors, by breaking certain symmetries. Here we show that the mesoscopic point-contacts between silver (Ag) and Cd${}_3$As${}_2$ exhibit superconductivity up to a critical temperature (onset) of 6 K while neither Cd${}_3$As${}_2$ nor Ag are superconductors. A gap amplitude of 6.5 meV is measured spectroscopically in this phase that varies weakly with temperature and survives up to a remarkably high temperature of 13 K indicating the presence of a robust normal-state pseudogap. The observations indicate the emergence of a new unconventional superconducting phase that exists only in a quantum mechanically confined region under a point-contact between a Dirac semi-metal and a normal metal.

includes supplementary materials at the end

References in corpus (7)

• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Landau Quantization and Quasiparticle Interference in the Three-Dimensional Dirac Semimetal Cd3As2
• Observation of superconductivity in 3D Dirac semimetal Cd3As2 crystal
• The role of critical current on point contact Andreev Reflection spectrum between a normal metal and a superconductor
• Topological superconductivity in Dirac semimetals
• Phase-incoherent superconducting pairs in the normal state of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Quasi-classical theory of tunneling spectroscopy in superconducting topological insulator

Cited by in corpus (94)

• Topological superconductors: a review
• Majorana Fermions and Topology in Superconductors
• Multiple topological states in iron-based superconductors
• Observation of superconductivity in 3D Dirac semimetal Cd3As2 crystal
• A High-Performance Mid-infrared Optical Switch Enabled by Bulk Dirac Fermions in Cd3As2
• Quantum Transport in Topological Semimetals under Magnetic Fields
• $4\pi$ periodic Andreev bound states in a Dirac semimetal
• Topological Semimetal Nanostructures: From Properties to Topotronics
• p-wave triggered superconductivity in single layer graphene on an electron-doped oxide superconductor
• Tip induced unconventional superconductivity on Weyl semimetal TaAs
• Manipulation of type-I and type-II Dirac points in PdTe2 superconductor by external pressure
• Conventional Superconductivity in Type II Dirac Semimetal PdTe${}_2$
• Superconductivity in doped Dirac semimetals
• Mesoscopic superconductivity and high spin polarization coexisting at metallic point contacts on the Weyl semimetal TaAs
• Gate-tuned quantum Hall states in Dirac semimetal (Cd1-xZnx)3As2
• Superconductivity in topologically nontrivial material Au2Pb
• Exploring Topological Superconductivity in Topological Materials
• Quasiparticle interference on type-I and type-II Weyl semimetal surfaces: a review
• π and 4π Josephson Effects Mediated by a Dirac Semimetal
• Quantized surface transport in topological Dirac semimetal films
• Pressure-induced Superconductivity in the Three-component Fermion Topological Semimetal Molybdenum Phosphide
• Direct observation of Landau level resonance and mass generation in Dirac semimetal Cd3As2 thin films
• Vortex end Majorana zero modes in superconducting Dirac and Weyl semimetals
• Topological Crystalline Materials of $J=3/2$ Electrons: Antiperovskites, Dirac points, and High Winding Topological Superconductivity
• Bulk and surface states carried supercurrent in ballistic Nb-Dirac semimetal Cd3As2 nanowire-Nb junctions
• Superconductivity in type-II Weyl-semimetal WTe2 induced by a normal metal contact
• Inter-orbital topological superconductivity in spin-orbit coupled superconductors with inversion symmetry breaking
• Surface superconductivity in a three-dimensional Cd${}_3$As${}_2$ semimetal
• Electron Transport in Dirac and Weyl Semimetals
• Coexistence of bulk-nodal and surface-nodeless Cooper pairings in a superconducting Dirac semimetal
• Majorana multipole response of topological superconductors
• Euler Obstructed Cooper Pairing: Nodal Superconductivity and Hinge Majorana Zero Modes
• Observation of sub-kelvin superconductivity in Cd${}_3$As${}_2$ thin films
• Superconductivity Induced at a Point Contact on the Topological Semimetal Tungsten Carbide
• Towards the manipulation of topological states of matter: A perspective from electron transport
• Unexpected superconductivity at nanoscale junctions made on the topological crystalline insulator Pb${}_{0.6}$Sn${}_{0.4}$Te
• Ferromagnetic state above room temperature in a proximitized topological Dirac semimetal
• The soft-mode phonons mediated unconventional superconductivity in monolayer 1T'-WTe2
• Experimental search for the origin of low-energy modes in topological materials
• Topological properties of multilayers and surface steps in the SnTe material class
• Nodal higher-order topological superconductivity from a ${\mathcal{C}}_4$-symmetric Dirac semimetal
• Evidence of Interfacial Topological Superconductivity on the Topological Semimetal Tungsten Carbide Induced by Metal Deposition
• Double Majorana vortex zero modes in superconducting topological crystalline insulators with surface rotation anomaly
• Electron-phonon interaction and point contact enhanced superconductivity in trigonal PtBi2
• Tip-induced Superconductivity Coexisting with Preserved Topological Properties in Line-nodal Semimetal ZrSiS
• Evidence for pressure-induced node-pair annihilation in Cd3As2
• Electronic structure of the surface superconducting Weyl semimetal PtBi${}_2$
• Intrinsic surface superconducting instability in Type-I Weyl Semimetals
• Large transverse Hall-like signal in topological Dirac semimetal Cd3As2
• Majorana multipole response: General theory and application to wallpaper groups
• Pressure-induced superconductivity in the three-dimensional Dirac semimetal Cd3As2
• Observation of surface superconductivity in a three-dimensional Dirac material
• Interface superconductivity in a type-II Dirac semimetal NiTe${}_2$
• Magnetic response of Majorana Kramers pairs with an order-two symmetry
• Magnetic Response of Majorana Kramers Pairs Protected by Z2 Invariants
• Uncovering the behavior of Hf2Te2P and the candidate Dirac metal Zr2Te2P
• Nodal S-wave Superconductivity in Antiferromagnetic Semimetals
• Observation of the topological Dirac fermions and surface states in superconducting BaSn3
• Quasi-2D Fermi surface of superconducting line-nodal metal CaSb${}_2$
• Higgs amplitude mode in massless Dirac fermion systems
• Larkin-Ovchinnikov state of superconducting Weyl metals: Fundamental differences between pairings restricted and extended in the $\text{k}$-space
• Fully gapped superconducting state in Au2Pb: a natural candidate for topological superconductor
• Discovery of highly spin-polarized conducting surface states in the strong spin-orbit coupling semiconductor Sb${}_2$Se${}_3$
• Electric Multipoles of Double Majorana Kramers Pairs
• Emergence of intrinsic superconductivity below 1.178 K in the topologically non-trivial semimetal state of CaSn3
• A modular point contact spectroscopy probe for sub-Kelvin applications
• Suppression of transport spin-polarization of surface states with emergence of ferromagnetism in Mn-doped Bi2Se3
• Systematic electrochemical etching of various metal tips for tunneling spectroscopy and scanning probe microscopy
• Tip-induced Superconductivity
• Fermiology of a topological line-nodal compound CaSb2 and its implication to superconductivity: angle-resolved photoemission study
• Emergence of Topological Superconductivity in Doped Topological Dirac Semimetals under Symmetry-Lowering Lattice Distortions
• Strong electron-phonon coupling in 3D tungsten nitride and coexistence of intrinsic superconductivity and topological nodal line in its 2D limit
• Erasable superconductivity in topological insulator Bi2Se3 induced by voltage pulse
• Experimental detection of topological electronic state and large linear magnetoresistance in $SrS{n}_4$ superconductor
• Observation of surface superstructure induced by systematic vacancies in the topological Dirac semimetal Cd${}_3$As${}_2$
• Comment on "Tip induced unconventional superconductivity on Weyl semimetal TaAs" [arXiv:1607.00513]
• Magnetotransport properties of Cd3As2 nanostructures
• Giant Enhancement of Superconductivity in Zr Point Contacts
• Double Majorana Vortex Flat Bands in the Topological Dirac Superconductor
• Enhanced zero-bias conductance peak and splitting at mesoscopic interfaces between an $s$-wave superconductor and a 3D Dirac semimetal
• Reply to Comment on "Tip induced unconventional superconductivity on Weyl semimetal TaAs"
• Topological Transitions in a Model for Proximity Induced Superconductivity
• Quasiparticle interference and resonant states in normal and superconducting line nodal semimetals
• Photoemission Spectroscopic Evidence of Multiple Dirac Cones in Superconducting BaSn${}_3$
• Atomic Visualization of Bulk and Surface Superconductivity in Weyl Semimetal γ-PtBi2
• Superconducting topological Dirac semimetals: $P6/m$-Si${}_6$ and $P6/m$-NaSi${}_6$
• Superconductor Vortex Spectrum Including Fermi Arc States in Time-Reversal Symmetric Weyl Semimetals
• Formation of tungsten carbide by focused ion beam process: A route to high magnetic field resilient patterned superconducting nanostructures
• Supercurrent reversal in Zeeman-split Josephson junctions
• Superconducting Gap Structures in Wallpaper Fermion Systems
• Superconductivity in hole-doped germanium point contacts
• Multigap nodeless superconductivity in Dirac semimetal PdTe
• Pressure-induced superconductivity and topological quantum phase transitions in a quasi-one-dimensional topological insulator: Bi4I4
• Double-twisted surface spectrum from hybridized Majorana Kramers pairs and wallpaper fermions