# Hall effect

1. Jan 16, 2010

### Petar Mali

I have a few questions about this effect. If I have some semiconductor of N type in which I have electrical field in x direction, and magnetic field in z direction

$$\vec{E}=E\vec{e}_x$$

$$\vec{B}=B\vec{e}_z$$

Then Lorence force is in the -y direction because in N type of semiconductor $$n>>p$$ so

$$F_l=-e\vec{\upsilon_D}x\vec{B}$$

And for this case Hall constant $$R_H=-\frac{1}{ne}$$ is negative. Am I right?

And in same case but for P type Lorentz force will be

$$F_l=e\vec{\upsilon_D}x\vec{B}$$

so in y direction, and Hall constant

$$R_H=\frac{1}{pe}$$?

2. Jan 16, 2010

All clear.