We construct a gravity dual for charge density waves (CDW) in which thetranslational symmetry along one spatial direction is spontaneously broken. Ourlinear perturbation calculation on the gravity side produces the frequencydependence of the optical conductivity, which exhibits the two familiarfeatures of charge density waves, namely the pinned collective mode and gappedsingle-particle excitation. These two features indicate that our gravity dualalso provides a new mechanism to implement the metal to insulator phasetransition by CDW, which is further supported by the fact that d.c.conductivity decreases with the decreased temperature below the criticaltemperature.
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