Ling, Y (reprint author), Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China.
We construct a holographic model in the framework of Q-lattices whose dual exhibits metal-insulator transitions. By introducing an interacting term between the Q-lattice and the electromagnetic field in bulk geometry, we find such kind of transition can be Mott-like. The evidences are presented as follows. (i) The transition from a metallic phase to an insulating phase occurs when the lattice constant becomes larger. (ii) A hard gap in the insulating phase can be manifestly observed in the optical conductivity. Nevertheless, in the zero temperature limit this model exhibits novel metallic behavior, featured by a gap as well as a zero-frequency mode with tiny spectral weight. It implies that our model is dual to a doped Mott system in one dimension where umklapp scattering is frozen at zero temperature. The similarity between this model and some organic linear chain conductors is briefly discussed.
Natural Science Foundation of China [11275208, 11305018, 11178002]
; Jiangxi young scientists (JingGang Star) program
; 555 talent project of Jiangxi Province
; Program for Liaoning Excellent Talents in University [LJQ2014123]
; Perimeter Institute for Theoretical Physics
; Government of Canada through Industry Canada
; Province of Ontario through the Ministry of Economic Development and Innovation