Fig. 4.

Particle and spin conductances in the single-mode regime. $G_N$ (solid circles) and $G_{\sigma }$ (open triangles, every second error bar displayed) for various interaction strengths are presented as a function of the reduced temperature $T/T_c,$ which varies due to the dependence of $T_c$ on density and scattering length. Blue data points are obtained from the measurements shown in Figs. 2 and 3 B and D for $V_g=0.64$ μK and ${\nu }_x=23.2$ kHz. Red data points are obtained from the measurements shown in Fig. 3 A and C for $V_g=0.42$ μK and ${\nu }_x=14.5$ kHz. $G_N$ tends to the conductance quantum $1/h$ (horizontal dashed-dotted line) for weak interactions ($T/T_c\gg 1$). Error bars contain statistical and systematic errors (Materials and Methods).