Two-dimensional helical superconductivity and gapless superconducting edge modes in the 1T${}^{\prime }$-WS${}_2$/2H-WS${}_2$ heterophase bilayer

Abstract

We propose a material platform comprised of transition metal dichalcogenide (TMDC) heterostructures to realize the two-dimensional (2D) helical superconductivity with an intrinsic gap. By van der Waals stacking a 2D superconductor (1T${}^{\prime }$-WS${}_2$ with inversion symmetry) on top of a 2D topological insulator (2H-WS${}_2$ with mirror symmetry), the resulting TMDC bilayer exhibits Rashba superconductivity. Under an external in-plane magnetic field, the system can host finite-momentum Cooper pairing, evidenced by the divergence in the particle-particle susceptibility of a $k\cdot p$ Hamiltonian fitted to the \textit{ab initio} theory band structure. The resulting 2D helical superconducting phase can induce superconductivity in the edge states with its spatially varying order parameter. By varying the strength of the in-plane magnetic field, we demonstrate that the helical edge state can undergo a phase transition to a one-dimensional gapless phase with narrow Fermi segments corresponding to zero-energy Bogoliubov quasi-particles. The controllable one-dimensional gapless phase serves as a clear experimental fingerprint of 2D helical superconductivity. The proposed 2D TMDC heterostructure is promising for intrinsic nonreciprocal superconducting transport and the development of Majorana-based quantum devices.

References in corpus (33)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Maximally localized Wannier functions: Theory and applications
• WannierTools: An open-source software package for novel topological materials
• The PseudoDojo: Training and grading a 85 element optimized norm-conserving pseudopotential table
• Quantum Spin Hall Effect and Topological Field Effect Transistor in Two-Dimensional Transition Metal Dichalcogenides
• Wannier90 as a community code: new features and applications
• EPW: Electron-phonon coupling, transport and superconducting properties using maximally localized Wannier functions
• Superconducting 2D system with lifted spin degeneracy: Mixed singlet-triplet state
• The Coexistence of Superconductivity and Topological Order in the Bi2Se3 Thin Films
• Realization of the field-free Josephson Diode
• Induced Superconductivity in the Quantum Spin Hall Edge
• Supercurrent diode effect and finite momentum superconductivity
• Two-dimensional epitaxial superconductor-semiconductor heterostructures: A platform for topological superconducting networks
• Density functional perturbation theory for gated two-dimensional heterostructures: Theoretical developments and application to flexural phonons in graphene
• Zero-Energy Modes from Coalescing Andreev States in a Two-Dimensional Semiconductor-Superconductor Hybrid Platform
• Superconducting diode effect via conformal-mapped nanoholes
• Coexistence of Intrinsic Superconductivity and Topological Insulator State in Monoclinic Phase WS2
• High performance Wannier interpolation of Berry curvature and related quantities: WannierBerri code
• Theory of 2D superconductor with broken inversion symmetry
• Momentum space imaging of Cooper pairing in a half-Dirac-gas topological superconductor (a helical 2D topological superconductor)
• Demonstration of a superconducting diode-with-memory, operational at zero magnetic field with switchable nonreciprocity
• Ab-initio studies of exciton $g$ factors: Monolayer transition metal dichalcogenides in magnetic fields
• Diamagnetic mechanism of critical current non-reciprocity in multilayered superconductors
• Crossover of Ising- to Rashba-Type Superconductivity in Epitaxial Bi2Se3/Monolayer NbSe2 Heterostructures
• Hard superconducting gap in germanium
• Topological metals and finite-momentum superconductors
• Supercurrent Diode Effect in Helical Superconductors
• Gapless topological Fulde-Ferrell superfluidity induced by in-plane Zeeman field
• Superconducting diodes from magnetization gradients
• Superconducting Diode Effect in Multiphase Superconductors
• Diode effect in the Fraunhofer pattern of disordered planar Josephson junctions
• Helical phases and Bogoliubov Fermi surfaces probed by superconducting diode effects