Hey.
I want to derive the conductivity of graphene.
I'm looking for a formula of the sort:
J = \frac{e}{\hbar} n \frac{dE}{dk} D(E) \Delta E
where
\frac{1}{\hbar} \frac{dE}{dk}
is the electron velocity,
D(E) = \frac{dN}{dE}
is the density of states,
\Delta E
might be the applied voltage...
Hi I'm a third year physics student currently working on my bachelorstage, and I have a differential equation I want to solve, but can't =).
Given an planet with an atmosphere so thick relative to the planet radius, that gravitation in the atmosphere cannot be seen as a constant but decreases...