Surface Functional Renormalization Group for Layered Quantum Materials
Annalen der Physik, vol. 538
Abstract
ABSTRACT We present an extension to the 2D functional renormalization group to efficiently treat interactions on the surface or at interfaces of 3D systems. As an application, we consider a semi‐infinite stack of 2D square lattices, including a Hubbard interaction on the surface layer and an alternating interlayer coupling. We investigate how strongly correlated states of the decoupled 2D Hubbard model on the surface evolve under inclusion of such an SSH‐like interlayer coupling. For large parts of the phase diagram as a function of the interlayer hopping parameters, the physics of the 2D system prevails, with antiferromagnetic, superconducting ‐wave, and ferromagnetic correlations taking center stage. However, for intermediate interlayer couplings the superconducting state at intermediate interaction strengths separates into two regimes by a small region of incommensurate spin‐density‐wave and spin‐bond order, enabling the potential realization of chiral spin‐bond order.
Authors 2
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Lennart Klebl corresponding
Affiliation as printed
Institute for Theoretical Physics and Astrophysics Universität Würzburg Würzburg Germany
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RWTH Aachen University · Max Planck Institute for the Structure and Dynamics of Matter · Center for Free-Electron Laser Science
Affiliation as printed
Institut für Theorie der Statistischen Physik RWTH Aachen University and JARA‐Fundamentals of Future Information Technology Aachen Germany
Max Planck Institute for the Structure and Dynamics of Matter Center for Free Electron Laser Science Hamburg Germany