Metal-insulator Transition by Holographic Charge Density Waves

Abstract

We construct a gravity dual for charge density waves (CDW) in which the translational symmetry along one spatial direction is spontaneously broken. Our linear perturbation calculation on the gravity side produces the frequency dependence of the optical conductivity, which exhibits the two familiar features of charge density waves, namely the pinned collective mode and gapped single-particle excitation. These two features indicate that our gravity dual also provides a new mechanism to implement the metal to insulator phase transition by CDW, which is further supported by the fact that d.c. conductivity decreases with the decreased temperature below the critical temperature.

References added, version to appear in Physical Review Letters

References in corpus (3)

• Building an AdS/CFT superconductor
• Spatially Modulated Phase in Holographic Quark-Gluon Plasma
• Fluctuations and instabilities of a holographic metal

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