NNSE618-L5-holes-bandstr-experiments

NNSE618-L5-holes-bandstr-experiments - 1 Lecture contents...

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NNSE 618 Lecture #5 1 Lecture contents Free and crystal electrons Holes Few experimental techniques for bandstructure determination UPS ECR
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Lecture #5 2 Free electrons and crystal electrons Free electrons m k dr m i v * Kinetic energy: m k E 2 2 2 Electrons in semiconductor * 2 ) ( 2 0 2 m k k E Dispersion near band extremum (isotropic and parabolic): Velocity or group velocity: ) ( ) ( r u e r k ikr k Wave function: Wave function: ikr k e V r 1 ) ( * ) ( 0 m k k v Group velocity: ) ( 1 k E v k Velocity at band extremum: Dynamics ( F – force): Dynamics at band extremum: F m dt dv 1     2 2 2 2 1 * 1 ; * 1 1 1 1 k E m F m dt dv F E Fv dt dE dt dv k k k k (if m* isotropic and parabolic) Force equation: dt dk dt dp F Force equation: dt dk F ) (
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This note was uploaded on 11/07/2011 for the course NNSE 618 taught by Professor Sergeoktyabrsky during the Spring '11 term at SUNY Albany.

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NNSE618-L5-holes-bandstr-experiments - 1 Lecture contents...

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