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Inspired by the parity-time symmetry concept, we show that a judiciousspatial modulation of gain and loss in epsilon-near-zero metamaterials caninduce the propagation of exponentially-bound interface modes characterized byzero attenuation. With specific reference to a bi-layer configuration, viaanalytical studies and parameterization of the dispersion equation, we showthat this waveguiding mechanism can be sustained in the presence of moderategain/loss levels, and it becomes leaky (i.e., radiative) below a gain/lossthreshold. Moreover, we explore a possible rod-based metamaterialimplementation, based on realistic material constituents, which captures theessential features of the waveguiding mechanism, in good agreement with ourtheoretical predictions. Our results may open up new possibilities for thedesign of optical devices and reconfigurable nanophotonics platforms.

$\mathcal{PT}$-Symmetry-Induced Wave Confinement and Guiding in Epsilon-Near-Zero Metamaterials