Register to reply

Help deriving expression of current density

by lagger2
Tags: current, density, deriving, expression
Share this thread:
Sep3-11, 05:37 AM
P: 1
Hey I got an assignment where I have to get an expression of the current density to be:

j = -e[itex]\int[/itex] [itex]\frac{dk}{4\pi ^{3}}[/itex] v[itex]_{x}[/itex]f(k)

It says k[itex]_{x}[/itex] >0 underneath the intergrale. The current is flowing to the right (velocity of v[itex]_{x}[/itex] > 0)

Where f(k) is the fermi-dirac distribution function and the interval where I have to find the Current density is in the region x[itex]_{0}[/itex]<x<x[itex]_{1}[/itex] (energy barrier). The height of the barrier is W.

Plz help me?!
Phys.Org News Partner Physics news on
Technique simplifies the creation of high-tech crystals
Working group explores the 'frustration' of spin glasses
New analysis of oxide glass structures could guide the forecasting of melt formation in planetary interiors

Register to reply

Related Discussions
Deriving expression for capacitor voltage Engineering, Comp Sci, & Technology Homework 1
Deriving Irradiance Expression Advanced Physics Homework 0
Deriving expression for k_eff Introductory Physics Homework 1
Deriving current expression from the info given Advanced Physics Homework 1
Deriving Expression Introductory Physics Homework 9