104A Sp09 lecture 15

104A Sp09 lecture 15 - Optical Properties of Metals...

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Conductors, Semiconductors and Insulators 10 8 4 -4 -8 -12 -16 -20 10 10 10 10 10 10 10 glass diamond fused silica silicon germanium iron copper insulators semiconductors metals Conductivity ( ! -cm ) –1 –1 0 The entire range of conductivities of solids spans roughly 30 orders of magnitude. no orbitals in the gap
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Orbitals from a Linear Chain of N Atoms via Overlap of s Orbitals
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Na 4 ••• ••• Na Na 2 Na 3 Na n ••• Combinations of 3s Orbitals of Sodium Atoms most antibonding most bonding
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3p 3s Na 3p 3s Mg Energy Band Structure for Sodium and Magnesium
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The Fermi Distribution The population decays exponentially at energies above the Fermi level.
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Unformatted text preview: Optical Properties of Metals Possible electronic transitions in a half-filled band of a metal 60 Wavelength (nm) 700 600 500 400 100 80 40 20 gold copper aluminum silver % Reflectivity Semiconductors intrinsic semiconductor The band gap is so small that the Fermi distribution results in some electrons populating the empty upper band. extrinsic semiconductors (a) an n-type semiconductor (b) a p-type semiconductor...
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  • Spring '09
  • Tiley
  • 1 -cm, Optical Properties of Metals, insulators semiconductors metals, 3s 3s Na, semiconductor extrinsic semiconductors

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104A Sp09 lecture 15 - Optical Properties of Metals...

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