Ordering phenomena in dimerized Mott insulators on a triangular lattice: effects of electronic correlations and anion coupling
Final Report Abstract
The present project brought several major breakthroughs in the field of molecular quantum materials: Establishing a quantitative phase diagram valid for all spin quantum liquid Mott insulators. - Establishing the coexistence regime at the first-order Mott transition in bandwidth tuned correlated electrons below the critical endpoint. - Mapping the dynamics in Landau Fermi-liquid regime and establishing the displaced Drude peak when the quasi-particles evade. - Prove of a gapped magnetic ground state in the triangular quantum spin liquid compounds. There are two important aspects, which have to be explored in future DFG projects: Having created the quantitative phase diagram of genuine Mott insulators – i.e. fully frustrated systems where the transition from a paramagnetic insulator to a paramagnetic Fermi liquid metal is obtained by tuning the effective correlations – and established the electronic phase coexistence at the first-order transition below Tcrit, the question of disorder becomes eminent. - Having established the gapped magnetic ground state for the most prominent quantum spin liquid compound κ-(BEDT-TTF)2 Cu2(CN)3 by our novel ESR technique, we immediately have to ask about the ground state properties of other frustrated magnetic systems on triangular lattices and even beyond.
