Extended Data Fig. 1: Validating terahertz near-fields in an atomic tunnel junction.
a, Asymmetric terahertz pulses with an incident field strength of ESF,pk and near-field voltage of VSF,pk are constructed by varying the terahertz pulse interferometer delay time (τφ) after inverting the polarity of one interferometer arm with respect to the other. b, The measurements required for waveform validation at a particular τφ are a THz-CC field profile (ΔQTHz as a function of τCC) and a QTHz–VSF,pk curve. c, The THz-STS inversion algorithm uses both measurements to extract the current–voltage characteristic for the tunnel junction that is used to re-rectify the measured terahertz field profile. This produces a simulated current pulse and simulated cross-correlation waveform. If the simulated current pulse is unipolar and the measured and the simulated cross-correlation waveforms match, then the measured field profile is consistent with the model and verified to be accurate.
