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TT: Fachverband Tiefe Temperaturen

TT 19: Frustrated Magnets - Spin Liquids - Theory

TT 19.10: Talk

Monday, March 12, 2018, 17:30–17:45, H 3010

Fractionalized Fermi liquids and exotic superconductivity in the Kitaev Kondo lattice — •Urban F. P. Seifert¹, Tobias Meng¹, and Matthias Vojta^1,2 — ¹Institut für Theoretische Physik, Technische Universität Dresden, 01062 Dresden, Germany — ²Center for Transport and Devices of Emergent Materials, Technische Universität Dresden, 01062 Dresden, Germany

Fractionalized Fermi liquids (FL^∗) have been introduced as non-Fermi-liquid metallic phases, characterized by coexisting electron-like charge carriers and local moments which itself form a fractionalized spin liquid. Here we investigate a Kondo lattice model on the honeycomb lattice with compass interactions among the local moments, a concrete model hosting FL^∗ phases based on Kitaev’s Z₂ spin liquid. We characterize the FL^∗ phases via perturbation theory, and we employ a Majorana-fermion mean-field theory to map out the full phase diagram. Most remarkably we find triplet superconducting phases which mask the quantum phase transition between fractionalized and conventional Fermi liquid phases. Their pairing structure is inherited from the Kitaev spin liquid, i.e., superconductivity is driven by Majorana glue.