Correlation-Driven Charge Order in a Frustrated Two-Dimensional Atom Lattice
| Autor: | Ralph Claessen, Julian Maklar, Florian Adler, J. Schäfer, Stephan Rachel, Manuel Laubach, Andrzej Fleszar |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics FOS: Physical sciences General Physics and Astronomy Electron Elementary charge 01 natural sciences law.invention Condensed Matter - Strongly Correlated Electrons law 0103 physical sciences State of matter Coulomb Hexagonal lattice Density functional theory Scanning tunneling microscope 010306 general physics Ground state |
| Zdroj: | Physical Review Letters. 123 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.123.086401 |
| Popis: | 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. Comment: 6 pages, 4 figures. Update: included small refinements from the peer review process |
| Databáze: | OpenAIRE |
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