Ultrafast, multidimensional spectroscopy unlocks macroscopic-scale effects of quantum electronic correlations.

Researchers found that low-energy and high energy states are correlated in a layered, superconducting material LSCO (lanthanum, strontium, copper, oxygen).

Exciting the material with an ultrafast (<100fs), beam of near-infrared light produces coherent excitations lasting a surprisingly 'long' time of around 500 femtoseconds, originating from a quantum superposition of excited states within the crystal.

The strong correlation between the energy of this coherence and the optical energy of the emitted signal indicates a coherent interaction between the states at low and high energy.

This kind of coherent interaction, reported here for the first time, is the root of many intriguing and poorly-understood phenomena displayed by quantum materials.

It is one of the first applications of multidimensional spectroscopy to study of correlated electron systems such as high-temperature superconductors.

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