Course Name
Paradigms in Physics: Periodic Systems
Course Number
ph427
Year/Term
Spring-2026
Course Credits
4
Class meeting times
9 hours of lecture/discussion per week for five weeks.
Prerequisites
PH424, PH425
Course description
Quantum waves in position and momentum space; Bloch waves in one-dimensional periodic systems, and the reciprocal lattice; coupled harmonic oscillators; phonons.
Topic/Day
Activities
Resources
Homework Due
Day 1
Welcome & Overview
Day 2
Normal Modes of 2 Coupled Oscillating Masses
Reading: Taylor 11.1,2
Normal Modes PhET
2 Coupled Oscillators - Special Case
Reading: Taylor 11.3,7
Day 3
Gaussian Functions
Normalization of the Gaussian
Day 4
Review Fourier Series
Definition of Fourier Transform and Inverse

Reading: Fourier Transforms

Reading: McIntyre Appendix D - Waves & Fourier Analysis

Day 5
More Fourier Transforms
Day 6
Bound States for the Infinite Square Well
Day 7
Bound States for the Finite Well

Reading: McIntyre 5.5

Bound States PhET

Day 8
Qualitative (Eyeball) Solutions for a Bumpy Well
Reading: McIntyre 5.10.1
Day 9
Free Particle
Free Particle Energy Eigenstates
Free Particle Momentum Eigenstates & de Broglie Wavelength
Day 10
Intro to Momentum Space
Day 11
Gaussian Wave Packets

Reading: McIntyre 6.2

Wave Packet PhET

Intro to Wave Packets: Discrete Superposition
Day 12
Momentum Representation Operators
Day 13
Uncertainty Principle
Reading: McIntyre 6.3
Day 14
Unbound States & Scattering
Reading: McIntyre 6.4
Day 15
Tunneling Through Barriers
Reading: McIntyre 6.5
Day 16
Ring of 4 Oscillators
Day 17
Day 18
Day 19
Normal Modes & Translational Symmetry
Day 20
N Oscillators
Reading: Taylor 11.5
Day 21
Infinite Oscillators in a Ring
Day 22
LCAO: Energy Eigenstates of a Two-Well Chain
Reading: McIntyre 15.1.1
Day 23
LCAO: Energy Eigenstates of an N-Well Chain
Reading: McIntyre 15.1.2
Day 24
Band Structure
Reading: McIntyre 15.4
Bloch's Theorem & the Molecular States
Reading: McIntyre 15.5
Density of states
Reading: McIntyre 15.7
Day 25
Review
Final Exam
Final Exam Schedule