3.Mass_Holes

# 3.Mass_Holes - 1 Real bands effective mass Real holes...

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1 Real bands, effective mass, Real bands, effective mass, holes, energy holes, energy - - band diagram band diagram Sections 2.8-2.13 of course text: 1. Bands in real semiconductors 2. Effective mass 3. Parabolic Band Approximation 4. Holes 5. Constant energy surfaces 6. Energy band diagram

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2 Energy bands in real materials Energy bands in real materials This is what we have from our toy model. This is what you get for real silicon. Note: • 4 (FOUR) bands for valence electrons • Indirect bandgap • Strange notation for Bloch wavevector
3 Brillouin Brillouin zone zone PUC in reciprocal space PUC in reciprocal space x a k 2 π /a 1-D 2-D Where is the BZ? 3-D

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4 Crystal momentum and external force Crystal momentum and external force Energy gain from an external force e.g., F= -q Є group velocity d ω /dk Chain Rule ћ k is the crystal momentum ћ k is the momentum for EXTERNAL forces acting on the electron!!!
Effective mass Effective mass Newton

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• Fall '09
• David
• Condensed matter physics, effective masses, Bloch wavevector, Holes Constant energy, energy-band diagram holes

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3.Mass_Holes - 1 Real bands effective mass Real holes...

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