A novel insulator by holographic Q-lattices. (English) Zbl 1388.83295
Summary: We construct a bulk geometry with Q-lattice structure, which is implemented by two gauge fields and a coupling between the lattice and the Maxwell field. This gravity dual model can describe a novel insulator which exhibits some key features analogous to Mott insulator. In particular, a hard gap in insulating phase as well as vanishing DC conductivity can be simultaneously achieved. In addition, we discuss the non-Drude behavior of the optical conductivity in low frequency region in insulating phase, which exhibits some novel characteristics different from ordinary Mott insulator.
MSC:
| 83C47 | Methods of quantum field theory in general relativity and gravitational theory |
Keywords:
holography and condensed matter physics (AdS/CMT); gauge-gravity correspondence; AdS-CFT correspondenceReferences:
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