Chiral d -wave superconductivity in a triangular surface lattice mediated by long-range interaction
Year: 2018
Type: article
Abstract: Adatom systems on the Si(111) surface have recently attracted an increasing attention as strongly correlated systems with a rich phase diagram. We study these materials by a single band model on the triangular lattice, including $1/r$ long-range interaction. Employing the recently proposed TRILEX method, we find an unconventional superconducting phase of chiral $d$-wave symmetry in hole-doped systems. Contrary to usual scenarios where charge and spin fluctuations are seen to compete, here the superconductivity is driven simultaneously by both charge and spin fluctuations and crucially relies on the presence of the long-range tail of the interaction. We provide an analysis of the relevant collective bosonic modes and predict how a cumulative charge and spin paring mechanism leads to superconductivity in doped silicon adatom materials.
Institutions: Max Planck Institute for Solid State Research, Rutgers, The State University of New Jersey, Centre National de la Recherche Scientifique, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Institut de Physique Théorique, Chinese Academy of Sciences, Ningbo Institute of Industrial Technology, University of Tübingen
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Award: G8311404501
OpenAlex ID: W2763388050