Correlation-driven charge order in a frustrated two-dimensional atom lattice

Abstract

We thoroughly examine the ground state of the triangular lattice of Pb on Si(111) using scanning tunneling microscopy. We detect charge-order, accompanied by a subtle structural reconstruction. Applying the extended variational cluster approach we map out the phase diagram as a function of local and non-local Coulomb interactions. Comparing the experimental data with the theoretical modeling leads us to conclude that electron correlations are the driving force of the charge-ordered state in Pb/Si(111), rather than Fermi surface nesting. These results resolve the discussion about the origin of the well known $3\times 3$ reconstruction forming below $86$K. By exploiting the tunability of correlation strength, hopping parameters and bandfilling, this material class represents a promising platform to search for exotic states of matter, in particular, for chiral topological superconductivity.

arXiv comment6 pages, 4 figures. Update: included small refinements from the peer review process

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• Magnetic and charge susceptibilities in the half-filled triangular lattice Hubbard model
• Interplay between Zhang-Rice singlets and high-spin states in a model for doped NiO${}_2$ planes
• Doping-dependent charge- and spin-density wave orderings in a monolayer of Pb adatoms on Si(111)
• Manipulating Hubbard-type Coulomb blockade effect of metallic wires embedded in an insulator
• Quasiparticle excitations in a one-dimensional interacting topological insulator: Application for dopant-based quantum simulation
• Charge ordered phases in the hole-doped triangular Mott insulator 4Hb-TaS2
• Charge density wave in single-layer Pb/Ge(111) driven by Pb-substrate exchange interaction
• Phonon-induced electronic relaxation in a strongly correlated system: the Sn/Si(111) $(\sqrt{3}\times \sqrt{3})$ adlayer revisited
• Chern number landscape of spin-orbit coupled chiral superconductors
• Electronic structure, spin-orbit interaction and electron-phonon coupling of triangular adatom lattices on semiconductor substrates
• The electronic structure of a doped Mott-Hubbard surface
• Topological Superconductivity in Sn/Si(111) driven by non-local Coulomb interactions