Interaction-induced double-sided skin effect in an exciton-polariton system

The non-Hermitian skin effect can be realized through asymmetric hopping between forward and backward directions, where all the modes of system are localized at one edge a finite 1D lattice. Here we show theoretically that in chain exciton-polariton micropillars with symmetric hopping, inherent nonlinearity exhibit double-sided (bi-skin) based fluctuations system, two edges system. To topological origin such modes, calculate winding number. bi-skin detected experimentally as an intensity drop increase opposite upon polariton density under continuous wave excitation.