Engineering interaction-induced topological insulators in a √3 × √3 substrate-induced honeycomb superlattice
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PhysRevB.93.045428.pdf
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Author(s)
Venderbos, Jorn W. F.
Manzardo, Marco
Efremov, Dmitry V.
van den Brink, Jeroen
Ortix, Carmine
Date Issued
January 2016
Journal
Physical Review B
Publisher
American Physical Society
Citation
Venderbos, Jorn W. F., Marco Manzardo, Dmitry V. Efremov, Jeroen van den Brink, and Carmine Ortix. "Engineering interaction-induced topological insulators in a √3 × √3 substrate-induced honeycomb superlattice." Phys. Rev. B 93, 045428 (January 2016). © 2016 American Physical Society
Version
Final published version
Abstract
We consider a system of spinless fermions on the honeycomb lattice with substrate-induced modulated electrostatic potentials tripling the unit cell. The resulting non-Abelian SU(2) gauge fields act cooperatively to realize a quadratic band crossing point (QBCP). Using a combination of mean-field theory and renormalization group techniques, we show that in the QBCP regime, arbitrarily weak repulsive electronic interactions drive the system into the quantum anomalous Hall state. This proves that substrate-induced local voltages are an effective knob to induce the spontaneous formation of a topological quantum phase.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.93.045428
