Fischer, JulianSavenko, IvanFraser, Michael D.Holzinger, SBrodbeck, SebastianKamp, MartinShelykh, I.A.Schneider, CHofling, Sven2018-11-292018-11-290031-9007http://hdl.handle.net/1885/152439In this work, we combine a systematic experimental investigation of the power- and temperature-dependent evolution of the spatial coherence function, g(1)(r), in a one dimensional exciton-polariton channel with a modern microscopic numerical theory based on a stochastic master equation approach. The spatial coherence function g(1)(r) is extracted via high-precision Michelson interferometry, which allows us to demonstrate that in the regime of nonresonant excitation, the dependence g(1)(r) reaches a saturation value with a plateau, which is determined by the intensity of the pump and effective temperature of the crystal lattice. The theory, which was extended to allow for treating incoherent excitation in a stochastic frame, matches the experimental data with good qualitative and quantitative agreement. This allows us to verify the prediction that the decay of the off-diagonal long-range order can be almost fully suppressed in one dimensional condensate systems.application/pdfKeywords: Excitons; Michelson interferometers; Phonons; Photons; Quantum theory; Effective temperature; Experimental investigations; Michelson interferometry; Non-resonant excitation; Quantitative agreement; Spatial coherence properties; Stochastic master equations201410.1103/PhysRevLett.113.2039022018-11-29