Figure 1

(a) Measured photoluminescence in momentum space over a large spectral range. Several one-dimensional lower polariton branches are visible, each corresponding to a different transverse state. Dashed lines: fit of the dispersion branches using a semiclassical model (see text). (b) Spectral zoom over the spectral range of interest, below the lasing threshold, and (c) above. (d) Scanning electron micrograph of the microwire; the emission angle $\theta$ is indicated.Reuse & Permissions

Figure 2

(a) Output polariton emission intensity (circles) and linewidth of the emission (stars) vs input excitation. The vertical dashed lines separate the three regimes of emission intensity: linear (left), exciton-exciton scattering (center), and polariton lasing (right). (b) Blueshift of the polariton emission over the same range of excitation power. (c) Filled blue circles: measured excitation threshold for polariton lasing vs polariton branch energy. Open circles above: theoretical gain peaks and typical linewidth (horizontal black line) of the mechanisms considered in the text.Reuse & Permissions

Figure 3

Measured $g^{\left(1\right)}(x,-x)$ functions on two points of two different wires, below (red circles) and above (blue squares) threshold. Condensate energies: 3351 meV (a) and $3353.2$ meV (b). Solid lines: theoretical fit of the data; below (red line) and above (blue line) threshold (details in the Supplemental Material[39]). (c) and (d) Microphotoluminescence images obtained below threshold. Dashed blue line: potential experienced by the polariton condensate of (a) and (b). Lower panel: calculated correlation functions averaged over 15 disorder realizations (e) and (f) versus lifetime for $V_0=0.21$ meV and $V_0=2.28$ meV, respectively, and (g) versus disorder amplitude $V_0$ for a lifetime of 2 ps; other parameters as in (a).Reuse & Permissions