Spectroscopic signature of spin triplet odd-valley superconductivity in two-dimensional materials
arXiv:2304.14849 · doi:10.1103/PhysRevB.108.L180504
Abstract
Motivated by recent discoveries of superconductivity in lightly-doped multilayer graphene systems, we present a low-energy model to study superconductivity in 2D materials whose Fermi surface consists of two valleys at -points. We assume a triplet odd-valley superconducting order with a pair potential that is isotropic in each valley but has a different sign in the two different valleys. Our theory predicts the emergence of an almost flat band of edge states centered at zero energy for certain edge orientations. As a result, a prominent experimental signature of this type of superconductivity is the presence of a large zero-energy peak in the local density of states near specific edges. The results of the effective low-energy theory are confirmed by numerically analyzing a specific microscopic tight-binding realization of odd-valley superconductivity, f-wave superconductivity on a honeycomb lattice in a ribbon geometry. Our work provides a test for odd-valley superconductivity through edge spectroscopy.
arXiv comment4 pages, 3 figures
References in corpus (31)
- Magic-angle graphene superlattices: a new platform for unconventional superconductivity
- Tuning superconductivity in twisted bilayer graphene
- Superconductors, Orbital Magnets, and Correlated States in Magic Angle Bilayer Graphene
- A Common Thread: the pairing interaction for the unconventional superconductors
- Two Dimensional Ising Superconductivity in Gated MoS
- Tunable Phase Boundaries and Ultra-Strong Coupling Superconductivity in Mirror Symmetric Magic-Angle Trilayer Graphene
- Signatures of Gate-Tunable Superconductivity in Trilayer Graphene/Boron Nitride Moiré Superlattice
- Untying the insulating and superconducting orders in magic-angle graphene
- Electric field tunable unconventional superconductivity in alternating twist magic-angle trilayer graphene
- Superconductivity in rhombohedral trilayer graphene
- Isospin magnetism and spin-triplet superconductivity in Bernal bilayer graphene
- Twisted Bilayer Graphene: A Phonon Driven Superconductor
- Topology of Andreev Bound States with Flat Dispersion
- Spin-Orbit Enhanced Superconductivity in Bernal Bilayer Graphene
- Unconventional superconductivity in systems with annular Fermi surfaces: Application to rhombohedral trilayer graphene
- Superconductivity and correlated phases in non-twisted bilayer and trilayer graphene
- Acoustic-phonon-mediated superconductivity in rhombohedral trilayer graphene
- Andreev spectra and subgap bound states in multiband superconductors
- Superconductivity from Repulsive Interactions in Rhombohedral Trilayer Graphene: a Kohn-Luttinger-Like Mechanism
- Acoustic-phonon-mediated superconductivity in Bernal bilayer graphene
- Superconductivity from electronic interactions and spin-orbit enhancement in bilayer and trilayer graphene
- Metals, fractional metals, and superconductivity in rhombohedral trilayer graphene
- Unconventional superconductivity due to interband polarization
- Inter-orbital topological superconductivity in spin-orbit coupled superconductors with inversion symmetry breaking
- Surface density of states of s+-wave Cooper pairs in a two-band model
- The Josephson current in Fe-based superconducting junctions: theory and experiment
- Superconductivity induced by the inter-valley Coulomb scattering in a few layers of graphene
- Odd momentum pairing and superconductivity in vertical graphene heterostructures
- Pseudospin Paramagnons and the Superconducting Dome in Magic Angle Twisted Bilayer Graphene
- Impact of topology on the impurity effects in extended -wave superconductors with spin-orbit coupling
- Junctions and superconducting symmetry in twisted bilayer graphene