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A theory of polaritonic states is developed for a nanostructure with a widequantum well stressed perpendicular to the growth axis of the heterostructure.The role of the $K$-linear terms appearing in the exciton Hamiltonian under thestress is discussed. Exciton reflectance spectra are theoretically modeled forthe nanostructure. It is predicted that the spectral oscillations caused byinterference of the exciton-like and photon-like polariton modes disappear withthe increase of applied pressure and then appear again with opposite phaserelative to that observed at low pressure. Effects of gyrotropy and convergenceof masses of excitons with heavy and light holes due to their mixing by thedeformation is also considered. Numerical estimates performed for the GaAswells show that these effects can be experimentally observed at pressure $P <1$~GPa for the well widths of a fraction of micron.

Effect of uniaxial stress on the interference of polaritonic waves in wide quantum wells