Sun, M.Savenko, IvanFlayac, H.Liew, T. C. H.2021-06-092021-06-09Sun, M. et al. Multivalley engineering in semiconductor microcavities. Sci. Rep. 7, 45243; doi: 10.1038/srep45243 (2017).2045-2322http://hdl.handle.net/1885/236911We consider exciton-photon coupling in semiconductor microcavities in which separate periodic potentials have been embedded for excitons and photons. We show theoretically that this system supports degenerate ground-states appearing at non-zero inplane momenta, corresponding to multiple valleys in reciprocal space, which are further separated in polarization corresponding to a polarization-valley coupling in the system. Aside forming a basis for valleytronics, the multivalley dispersion is predicted to allow for spontaneous momentum symmetry breaking and two-mode squeezing under non-resonant and resonant excitation, respectivelyWe acknowledge support of Project Code (IBS-R024-D1); the Australian Research Council's Discovery Projects funding scheme (project DE160100167), the government of Russian Federation (project MK-5903.2016.2) and the Dynasty Foundation. TCHL was supported by the MOE AcRF Tier 1 grant 2016-T1-1-084 and MOE AcRF Tier 2 grant 2015-T2-1-055.application/pdfen-AU© 2017 The Author(s)https://creativecommons.org/licenses/by/4.0/2017-04-0310.1038/srep452432020-11-23Creative Commons Attribution 4.0 International License