Lecture 7 Notes: Transfer Matrix Theory
Consider a 3-layered mat erial with a index of
re fraction pro file:
n(x) n 2
A s discussed in the previ ous lecture, the z compo nent
of the wavev ector kz does not change throughout
Lecture 2 Notes: Semi Conductors
number of ways to classify SC:
1. Elemental vs. compound
2. Direct vs indirect gaps
3. Intrinsic vs. extrinsic
Plugging in the numbers into the Fermi function:
f E eE
kBT 0.025eV 22
Thus fermis fun
Lecture 3 Notes: Voltage
What happens when we apply voltage to a piece of
semiconductor? How do carriers respond to applied electric field?
From introductory physics we remember that electron motion is governed by the Lorentz force:
F e E
Lecture 4 Notes: Light Emissions
Carrier recombination. Light-emitting diodes.
In any semiconductor electrons and holes can meet spontaneously and recombine, i.e. conduction
electrons can fall down and fill the holes in the valence band, the excess energy
Lecture 6 Notes: Reflection and Refraction
Boundary Conditions: Continuity conditions for the fields obeying Maxwells Equations.
These conditions can be derived from application of Maxwells equations, Gauss and Stokes
Theorems and have to be satisfied at
Lecture 5 Notes: Polarization
The origins of polarization. Oscillator model.
Here will take a simple classical approach to gain some intuition about polarization. Similar
discussion may be applied to derivation of magnetization, where instead of electric
Lecture 9 Notes: Ferromagnetics
From now on we will focus on ferromagnetic materials as they are used most frequently in
applications ranging from magnetic data storage to power generation.
Last lecture we have shown how the fermionic nature of electrons
Lecture 8 Notes: Magnetization
Recall our discussion of the origins of polarization and its implications on the optical
properties of materials. Similar logic can be applied to the discussion of magnetization.
We can describe the material as a collection
Lecture 10 Notes: Magnetism
If all ferromagnets consisted of individual magnetic domains magnetized to saturation along one
of the easy axes, then any iron rod would act like a permanent magnet. This obviously does not
happen in nature. Why not?
Lecture 1 Notes: Fermi Gases
Filling the available states - Statistics of Fermi Gas.
How do electrons get distributed between the states are available to them?
Lets consider a simple case of a 2-particle gas. Particles A and B are identical in a system