Terahertz Light Pulses Unveil Superconductor Secrets

Variations in chemical composition create spatial disorder in the superconducting properties of the cuprate superconductor La1.83Sr0.17CuO4, represented by the different colored circles. This disorder affects interlayer tunneling, which can be detected through the isolated Josephson echo using angle-resolved two-dimensional terahertz spectroscopy.

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