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Fig. 4


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Two examples of a direct floating IAB − VAB characteristics recorded with the 2 initial set-up indicated when the sample was grounded. After setting up Tip A and Tip B distances to the Pb(111) surface, the sample was ungrounded. For this set up and for example in the symmetric set-up case IAGS  =  200 pA, IBGS  =  200 pA at 30 mV, it comes for the direct to the ground TAS  =  0.8613 × 10−4 (for sample grounded) and TBS  =  0.8613 × 10−4 (for sample grounded). The total transmission coefficient (leading to G in Eq. (1) via the Landauer formula) is T  =  0.4737 × 10−4 leading to TAB < 0.043 × 10−4 (sample not grounded).

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