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We propose a way to discover, in tabletop experiments, spacetime-emergentmaterials, that is, materials holographically dual to higher-dimensionalquantum gravity systems under the AdS/CFT correspondence. The emergence of theholographic spacetime is verified by a mathematical imaging transform of theresponse function on the material. We consider theories on a 1-dimensionalring-shaped material, and compute the response to a scalar source locally putat a point on the ring. When the theory on the material has a gravity dual, theimaging in the low temperature phase exhibits a distinct difference from theordinary materials: the spacetime-emergent material can look into theholographically emergent higher-dimensional curved spacetime and provides animage as if a wave had propagated there. Therefore the image is an experimentalsignature of the spacetime emergence. We also estimate temperature, ring sizeand source frequency usable in experiments, with an example of a quantumcritical material, TlCuCl$_3$.

Spacetime-emergent ring toward tabletop quantum gravity experiments