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96 CHAPTER 6. EXPERIMENTAL PROBES OF THE BAND STRUCTURE Figure 6.8: Schematic description of tunnelling between two materials maintained at a relative bias eV . The current is approximately given by the integrated area between the two chemical potentials (provided the matrix element for tunnelling is taken constant.) If the density of states of the contact (or probe, labelled 1 in the figure )is also slowly varying, then the differential conductance dI/dV is proportional to the density of states of the material itself, at the bias eV above the chemical potential µ 2 .
6.4. TUNNELLING 97 Figure 6.9: Differential conductance of a tunnel junction between superconducting Pb and metallic Mg reveals the gap in the density of states of superconducting lead. [I. Giaever, Nobel Prize Lecture, 1973]
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Quantum Condensed Matter Physics Pa
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4 CONTENTS 5.1 Bands and Brillouin
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6 CONTENTS also serves to give impo
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8 CONTENTS
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10 CHAPTER 1. CLASSICAL MODELS FOR
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28 CHAPTER 2. SOMMERFELD THEORY Res
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32 CHAPTER 2. SOMMERFELD THEORY
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34 CHAPTER 3. FROM ATOMS TO SOLIDS
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146 CHAPTER 10. FERMI LIQUID THEORY
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