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As a distinctive feature unique to non-Hermitian systems, non-Hermitian skineffect displays fruitful exotic phenomena in one or higher dimensions,especially when conventional topological phases are involved. Among them,hybrid skin-topological effect is theoretically proposed recently, whichexhibits anomalous localization of topological boundary states atlower-dimensional boundaries accompanied by extended bulk states. Here weexperimentally realize the hybrid skin-topological effect in a non-Hermitianphononic crystal. The phononic crystal, before tuning to be non-Hermitian, isan ideal acoustic realization of the Kane-Mele model, which hosts gaplesshelical edge states at the boundaries. By introducing a staggered distributionof loss, the spin-dependent edge modes pile up to opposite corners, leading toa direct observation of the spin-dependent hybrid skin-topological effect. Ourwork highlights the interplay between topology and non-Hermiticity and opensnew routes to non-Hermitian wave manipulations.

Spin-dependent localization of helical edge states in a non-Hermitian phononic crystal