Figure 3
Blue coloring represents CB-HBT data, and orange coloring represents AC-HBT data. (a) Gain of both circuits as a function of power. Calculated gain of the CB-HBT is shown (Section V in Supplementary Information). (b) Minimum input-referred noise as a function of power. CB-HBT has minimum of 19 fA/\(\sqrt{{\rm{Hz}}}\) at 800 nW, and AC-HBT has minimum of 26 fA/\(\sqrt{{\rm{Hz}}}\) at 8.4 μW. (c) Input-referred noise spectrum of both circuits for power that minimizes noise. The origin of the noise fluctuations at higher frequencies is unclear at this time. (d) Signal response (in normalized arbitrary units) for both circuits as a function of frequency. The CB-HBT has a -3 dB point at around 20 kHz, and the AC-HBT has a -3 dB point at around 650 kHz. (e) Electron temperature vs. power for both circuits. Base electron temperatures are between 120–150 mK.
