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We observe natural exceptional points in the excitation spectrum of anexciton-polariton system by optically tuning the light-matter interactions. Theobserved exceptional points do not require any spatial or polarization degreesof freedom and result solely from the transition from weak to stronglight-matter coupling. We demonstrate that they do not coincide with thethreshold for photon lasing, confirming previous theoretical predictions [Phys.Rev. Lett. 122, 185301 (2019), Optica 7, 1015 (2020) ]. Using a technique wherea strong coherent laser pump induces up-converted excitations, we encircle theexceptional point in the parameter space of coupling strength and particlemomentum. Our method of local optical control of light-matter coupling pavesthe way to investigation of fundamental phenomena including dissipative phasetransitions and non-Hermitian topological states.

Natural exceptional points in the excitation spectrum of a light-matter system