We report the experimental observation of second-order corner skin modes in a two-dimensional non-Hermitian electric circuit network describable with the Su-Schrieffer-Heeger model in one spatial direction and the Hatano-Nelson model in the orthogonal direction. A circuit Laplacian is reconstructed by a series of current-voltage measurements, from which complex admittance spectra and corresponding voltage distributions are obtained. In a L×L square lattice, the number of corner skin modes is found to be 2L, implying that the observed corner skin modes originate from a non-Hermitian topology.
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