Set of supplementary notes.
Set of supplementary notes.
Set of supplementary notes.
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96 CHAPTER 6. EXPERIMENTAL PROBES OF THE BAND STRUCTURE<br />
Figure 6.8: Schematic description <strong>of</strong> tunnelling between two materials maintained at a relative<br />
bias eV . The current is approximately given by the integrated area between the two chemical<br />
potentials (provided the matrix element for tunnelling is taken constant.) If the density <strong>of</strong> states<br />
<strong>of</strong> the contact (or probe, labelled 1 in the figure )is also slowly varying, then the differential<br />
conductance dI/dV is proportional to the density <strong>of</strong> states <strong>of</strong> the material itself, at the bias<br />
eV above the chemical potential µ 2 .
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