3582427150

3582427150



Department of Surface and Nanostructures Physics Institute of Physics UMCS


Spectroscopy: normalized conductance

Ixj‘rp(E)T(E,V)dE, for smali bias:    -- oc

Within WKB approximation, and for free-electron model:


T(V) = aV + rV3+...


p(E) - surface density of States of the sample T(E, V) - transmission of barrier at bias V p(r, V) - density of States at tip center


normalized plot

d\nI/d\nV= (dI/dV) /(//F)

reduces rapid increase of dI/dVdue to barrier transmission vs bias dependance


W



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