Possible Chiral Topological Superconductivity in CrO${}_2$ bilayers

Abstract

We address the possible emergence of spin triplet superconductivity in CrO${}_2$ bilayers, which are half-metals with fully spin-polarized conducting bands. Starting from a lattice model, we show that chiral $p+ip$ states compete with non-chiral $p$-wave ones. At large doping, the $p+ip$ channel has a sequence of topological phase transitions that can be tuned by gating effects and interaction strength. Among several phases, we find chiral topological phases having a single Majorana mode at the edge. We show that different topological superconducting phases could spontaneously emerge in the vicinity of the van-Hove singularities of the band.

arXiv comment5 pages, 4 figures; supplementary materials included; v2 updated version

References in corpus (28)

• Topological insulators and superconductors
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
• Paired states of fermions in two dimensions with breaking of parity and time-reversal symmetries, and the fractional quantum Hall effect
• Classification of topological insulators and superconductors in three spatial dimensions
• New directions in the pursuit of Majorana fermions in solid state systems
• Topological insulators and superconductors: ten-fold way and dimensional hierarchy
• Micrometer-scale ballistic transport in encapsulated graphene at room temperature
• Topological superconductors: a review
• Half-metallic ferromagnets: From band structure to many-body effects
• Topological Superconductivity and Superfluidity
• Chiral superconductivity from repulsive interactions in doped graphene
• Electrically detected interferometry of Majorana fermions in a topological insulator
• Majorana mode in vortex core of Bi2Te3/NbSe2 topological insulator-superconductor heterostructure
• Probing Neutral Majorana Fermion Edge Modes with Charge Transport
• Chiral Topological Superconductor From the Quantum Hall State
• Evaluation of Spin-Triplet Superconductivity in Sr2RuO4
• Chiral Majorana edge state in a quantum anomalous Hall insulator-superconductor structure
• Chiral Superconductors
• Observation of half-height magnetization steps in Sr2RuO4
• Competing many-body instabilities and unconventional superconductivity in graphene
• Truncation of a 2-dimensional Fermi surface due to quasiparticle gap formation at the saddle points
• Kohn-Luttinger superconductivity in graphene
• A novel platform for two-dimensional chiral topological superconductivity
• Topological superconductivity and Majorana fermions in half-metal / superconductor heterostructure
• Stability of half-quantum vorticies in p_x+ip_y superconductors
• Emergent topological and half semimetallic Dirac Fermions at oxide interfaces
• Odd momentum pairing and superconductivity in vertical graphene heterostructures