# homework8 - Department of Electrical and Computer...

This preview shows pages 1–2. Sign up to view the full content.

1 Department of Electrical and Computer Engineering, Cornell University ECE 407: Physics of Semiconductor and Nanostructures Spring 2009 Homework 8 Due on March 31, 2009 at 5:00 PM Suggested Readings: a) Lecture notes Problem 8.1: (Motion in magnetic fields and the Hall effect in semiconductors) Consider a semiconductor sample shown below. The semiconductor has a conduction band minimum at the Γ -point with an isotropic effective mass e m and a valence band maximum also at the Γ -point with an isotropic effective mass h m . A constant and uniform magnetic field is applied in the z-direction and is given by z B B o ˆ = r . A field x E is applied in the x-direction. You should assume that y E is also non zero. The ratio x y J E is called the Hall resistivity H ρ . a) If the semiconductor is n-doped with an electron density given by n , find the magnitude and sign of the Hall resistivity H . Assume that the hole density is zero. b) If the semiconductor is p-doped with a hole density given by p , find the magnitude and sign of the Hall resistivity H . Assume that the electron density is zero. Problem 8.2: (Graphene: statistics and current for non-parabolic bands)

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 04/04/2009 for the course ECE 4070 taught by Professor Rana during the Spring '08 term at Cornell University (Engineering School).

### Page1 / 3

homework8 - Department of Electrical and Computer...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online