Spectroscopic signatures of the Mott transition on the anisotropic triangular lattice
Harish-Chandra Research Institute - Chhatnag Road, Jhusi, Allahabad 211019, India
Received: 30 April 2014
Accepted: 3 October 2014
We use a new Monte Carlo method to study the Mott transition on the anisotropic-triangular-lattice Hubbard model. Our real space approach accurately treats the emergence of non-trivial magnetic correlation in this frustrated structure with reducing temperature. For hopping anisotropy typical of the two-dimensional organic salts, the coupling of electrons to self-generated magnetic moments leads to a pseudogap, huge d.c. resistivity, and non-Drude optical response over a wide temperature window. In addition to these generic signatures of a “bad metal”, the spatial correlation among the magnetic moments leads to pronounced momentum dependence of quasiparticle extinction and pseudogap formation on the Fermi surface as the Mott transition is approached.
PACS: 71.30.+h – Metal-insulator transitions and other electronic transitions / 71.27.+a – Strongly correlated electron systems; heavy fermions / 74.25.Gz – Optical properties
© EPLA, 2014