Fig. 2: Temperature dependence of CPR.

a The CPR measured at different temperatures. Symbols are experimental data and solid curves are theoretical calculations. All curves are shifted vertically for clarity. b Temperature dependence of the critical current (I_C, the amplitude of the CPR). Solid blue curve is the theoretical calculation. c The amplitude of the fast Fourier transform (FFT, red curve) of the CPR measured over −10π ≤ φ ≤ 10π at 20 mK, normalized to the amplitude (A₁) of the first harmonic vs. 2π/φ = B₀/B, where B₀ = Φ₀/S ~ 1.1 G and S = 16 μm². Black and blue curves are FFTs of the calculated CPR using our theoretical model and the perfectly ballistic model (Eq. (4)), respectively. d Total harmonic distortion (THD) and the normalized amplitude of the second (A₂/A₁) and third (A₃/A₁) harmonics vs. T, where A_j is the amplitude of the j^th harmonic. All data in this figure are measured in Sample A at the gate voltage V_g = 0 V. Theoretical calculations are performed for L = 100 nm, b = 300 nm, C_x = 6 μm, Δ₀ = 0.3 meV, μ′ = 50 meV, and ħv_F = 1 eV Å.