Searching for two-dimensional Weyl superconductors in heterostructures

Abstract

Two-dimensional Weyl superconductor is the most elusive member of a group of materials with Weyl fermions as low-energy excitations. Here, we propose to realize this state in a heterostructure consisting of thin films of half-metal and spin-singlet superconductor. In particular, for the $d$-wave case, a very robust two-dimensional Weyl superconductor (dWSC) is realized independent of the orientation of the spontaneous magnetization of the half-metal. The quasiparticle spectra of the dWSC show interesting evolution with the direction of the magnetization, featured by a series of Lifshitz transitions in the zero-energy contour of the quasiparticle spectrum. For a general magnetization orientation of the half-metal, the state is a combination of a superconducting component and a normal fluid component and is different from all known forms of pairings. In addition, we find a transition between type-I and type-II Weyl nodes. This is also the first example of a type-II Weyl node in the presence of superconducting correlation. The symmetries and topological properties of the system are analyzed. We also study the phases in the heterostructure with the half-metal replaced by a ferromagnetic metal with a partially spin-polarized Fermi surface.

arXiv comment17 pages, 10 figures

References in corpus (71)

• Topological Insulators
• Topological insulators and superconductors
• Quantum Spin Hall Effect in Graphene
• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• $Z_2$ Topological Order and the Quantum Spin Hall Effect
• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Electronic Structure of Pyrochlore Iridates: From Topological Dirac Metal to Mott Insulator
• Topological Insulators in Three Dimensions
• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• Angle-resolved photoemission spectroscopy of the cuprate superconductors
• A topological Dirac insulator in a quantum spin Hall phase : Experimental observation of first strong topological insulator
• Classification of topological insulators and superconductors in three spatial dimensions
• Type-II Weyl Semimetals
• Topological invariants of time-reversal-invariant band structures
• Weyl Semimetal in a Topological Insulator Multilayer
• Proximity effects in superconductor-ferromagnet heterostructures
• A generic new platform for topological quantum computation using semiconductor heterostructures
• Dirac semimetal and topological phase transitions in A3Bi (A=Na, K, Rb)
• Periodic table for topological insulators and superconductors
• Dirac semimetal in three dimensions
• Three Dimensional Dirac Semimetal and Quantum Transports in Cd3As2
• Symmetry protected topological orders and the group cohomology of their symmetry group
• Majorana fermions in a tunable semiconductor device
• Phase transition between the quantum spin Hall and insulator phases in 3D: emergence of a topological gapless phase
• Three dimensional topological invariants for time reversal invariant Hamiltonians and the three dimensional quantum spin Hall effect
• Dirac materials
• Superconducting 2D system with lifted spin degeneracy: Mixed singlet-triplet state
• Topological response in Weyl semimetals and the chiral anomaly
• Classification of stable three-dimensional Dirac semimetals with nontrivial topology
• Quantum Hall effects in a Weyl Semi-Metal: possible application in pyrochlore Iridates
• Recent developments in transport phenomena in Weyl semimetals
• Non-Abelian Topological Order in S-Wave Superfluids of Ultracold Fermionic Atoms
• Dirac Semimetals in Two Dimensions
• Topological Phases of Noncentrosymmetric Superconductors: Edge States, Majorana Fermions, and the Non-Abelian Statistics
• The Zak phase and the existence of edge states in graphene
• Charge Transport in Weyl Semimetals
• MoTe2: A Type-II Weyl Topological Metal
• Interior Gap Superfluidity
• $p_x+i{p}_y$ superfluid from s-wave interactions of fermionic cold atoms
• Andreev - Saint James reflections: a probe of cuprate superconductors
• Theory of Half Metal-Superconductor Heterostructures
• Majorana Fermions and Topology in Superconductors
• Topology of Andreev Bound States with Flat Dispersion
• Chiral gauge field and axial anomaly in a Weyl semi-metal
• Dirac and Weyl Superconductors in Three Dimensions
• A classification of symmetry enriched topological phases with exactly solvable models
• Structured Weyl Points in Spin-Orbit Coupled Fermionic Superfluids
• Phase separation in asymmetrical fermion superfluids
• Topological odd-parity superconductors
• Half-metallic semiDirac point generated by quantum confinement in TiO${}_2$/VO${}_2$ nanostructures
• Weyl superconductors
• Tight-binding modeling and low-energy behavior of the semi-Dirac point
• Superconductivity of doped Weyl semimetals: finite-momentum pairing and electronic analogues of the 3He-A phase
• Topological superconductivity and Majorana fermions in half-metal / superconductor heterostructure
• Surface density of states and topological edge states in non-centrosymmetric superconductors
• Breached pairing superfluidity: Possible realization in QCD
• Topological Lifshitz transitions
• Majorana Fermions in Nodal Superconductors: Gapless Topological Phase
• Topological Floquet Phases in Driven Coupled Rashba Nanowires
• Time reversal non-invariant non-Abelian topological order in non-centrosymmetric superconductors
• Classification and Properties of Symmetry Enriched Topological Phases: A Chern-Simons approach with applications to Z2 spin liquids
• Crossed surface flat bands of Weyl semimetal superconductors
• Majorana Flat Bands and Uni-directional Majorana Edge States in Gapless Topological Superconductors
• Surface spectral function in the superconducting state of a topological insulator
• Proximity effect, quasiparticle transport, and local magnetic moment in ferromagnet-d-wave superconductor junctions
• Hidden-Symmetry-Protected Topological Semimetals on a Square Lattice
• Route to Topological Superconductivity via Magnetic Field Rotation
• Paramagnetically induced gapful topological superconductors
• Novel anisotropic spin singlet pairings in Cu${}_x$Bi${}_2$Se${}_3$ and Bi${}_2$Te${}_3$
• Topological Phase Transitions and a Two-Dimensional Weyl Superconductor in a Half-Metal/Superconductor Heterostructure

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• Coupled Wire Models of Interacting Dirac Nodal Superconductors
• Larkin-Ovchinnikov state of superconducting Weyl metals: Fundamental differences between pairings restricted and extended in the $\text{k}$-space
• Superconducting phase transition in planar fermionic models with Dirac cone tilting