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
2 Symmetric Coupled Oscillators
Reading: Taylor 11.1,2
Coupled Oscillations Mathlet
Normal Modes PhET
Reading: Taylor 11.3,7
Day 3
Gaussian Functions
Gaussian Parameters
Normalization of the Gaussian
Day 4
Review Fourier Series
Definition of Fourier Transform and Inverse

Reading: GMM: Fourier Transforms

Reading: McIntyre Appendix D - Waves & Fourier Analysis

Day 5
Day 6
Wave Particle Duality
Energy Eigenvalue Equation and Wavefunction
McIntyre 5.2,3
Day 7
Bound States for the Infinite Square Well
McIntyre 5.4
Delta Function Potential Well
Day 8
Bound States for the Finite Well

Reading: McIntyre 5.5, 5.10.1

Bound States PhET

Day 9
Free Particle
McIntyre 6.1
Free Particle Energy Eigenstates
Free Particle Momentum Eigenstates & de Broglie Wavelength
Day 10
Intro to Momentum Space
McIntyre 6.1
Day 11
Momentum Representation Operators
Day 12
Intro to Wave Packets: Discrete Superposition
Gaussian Wave Packets

Reading: McIntyre 6.2

Wave Packet PhET

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
Coupled Oscillators Review
Taylor 11.1,2,3,7
Day 17
Ring of 4 Oscillators
Day 18
Normal Modes & Translational Symmetry
Day 19
N Oscillators
Reading: Taylor 11.5
Infinite Oscillators in a Ring
Day 20
Phonons
Day 21
LCAO: Energy Eigenstates of a Two-Well Chain
Reading: McIntyre 15.1.1
Day 22
LCAO: Energy Eigenstates of an N-Well Chain
Reading: McIntyre 15.1.2
Day 23
Band Structure
Reading: McIntyre 15.4
Day 24
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