Fig. 7
From: RF injection scanning tunneling spectroscopy of a superconducting NbSe2 surface
(a) Site-dependent variation of the QP peaks split by RF, whose VAC is 19.5 mV. Positions from 1 to 6 are marked in Fig. 6(a). The circles with identical colors indicate the pair of divided peaks. (b) Site-dependent SC gap energy estimated by QP peaks without RF (solid circles), and the energy gap of the middle points of the separated peaks (red and blue circles) with RF (open circles). The x-axis indicates the positions are the same as (a). (c) Average of the two split energies (energy between two red dots and energy between two blue dots). Positions 1–6 are identical to (a) and (b). (d) Simulated spectra, starting from the Spectrum 1 and 6 of Fig. 6(b). The color circles guide the identification of the split peak, the same as in (a). The spectra marked 1 + simul, and 6 + simul are simulated results of Eq. (1), in which starting G is regarded as spectrum 1 and 6.
