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(a) The two STM tip measurement electrical circuit diagram used on the Pb(111) surface with its 2 virtual ground I–V converters and the back ground controllable switch connected to the sample holder. TheVS sample holder is defined using µS = EF +eVS. (b) Three “one shot” dI/dV spectra recorded on Tip A while the far away Tip B is in atomic point contact with the Pb(111) surface to control the sample chemical potential from its surface. Tip B potential is VB = 0.0 mV (black), VB = +30 mV (blue) and VB = –30 mV (red). Tip A was stabilized in a tunnelling regime with its STM Feed-back loop set up IA = 200 pA, for VA = 30 mV.
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