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It is now well established that superconductivity in cuprates competes withcharge modulations giving electronic phase separation at a nanoscale. Morespecifically, superconducting electronic current takes root in the availablefree space left by electronic charge ordered domains, called charge densitywave (CDW) puddles. This means that CDW domain arrangement plays a fundamentalrole in the mechanism of high temperature superconductivity in cuprates. Herewe report about the possibility of controlling the population and spatialorganization of the charge density wave puddles in a single crystal La2CuO4+ythrough X - ray illumination and thermal treatments. We apply a pump - probemethod based on X - ray illumination as pump and X - ray diffraction as a probesetting a writing and reading procedure of CDW puddles. Our findings areexpected to allow new routes for advanced design and manipulation ofsuperconducting pathways in new electronics.

X-rays writing/reading of Charge Density Waves in the CuO2 plane of a simple cuprate superconductor