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Review of solid state physics

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Presentation on theme: "Review of solid state physics"— Presentation transcript:

1 Review of solid state physics
Lesson 2: Review of solid state physics

2 A) Short review of quantum mechanics
- De Broglie relation - Heisenberg uncertainty principle - Schrödinger wave equation and applications Time-dependent

3 Engineering VEngineering the nanostructure electronic properties
Time-independent Engineering VEngineering the nanostructure electronic properties Free particle: V=0 Hydrogen atom: V1/r

4 Harmonic oscillator: Vr2
Infinite square well potential: V(z)=0, 0<z<a; V(z)=, z<0, z>a E V0 z a

5

6 - Fermi-Dirac distribution
It plays a key role in the distribution of electrons in nanostructures

7 B) Free electron model of a solid; Density of states function

8 Born-von Karman conditions

9 Density of states

10

11

12 T=0 K

13 C) Bloch theorem Bloch states

14 D) Electrons in crystalline solids
Nearly free electron model (perturbation method) a

15

16 EG Metal: no energy gaps (free electrons, parabola) Semiconductors: EG~0.7-3 eV Insulators: EG>3 eV

17 Riduzione alla prima zona di Brillouin

18 E) Dynamics of electrons in bands
- Equation of motion

19

20 Crystal momentum

21 - Effective mass

22

23 - Holes

24 E) Lattice vibrations (Phonons)
- 1D monoatomic lattice

25

26 - 1D biatomic lattice

27 - Phonons


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