# Help deriving expression of current density

by lagger2
Tags: current, density, deriving, expression
 P: 1 Hey I got an assignment where I have to get an expression of the current density to be: j = -e$\int$ $\frac{dk}{4\pi ^{3}}$ v$_{x}$f(k) It says k$_{x}$ >0 underneath the intergrale. The current is flowing to the right (velocity of v$_{x}$ > 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$_{0}$

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