Can someone explain to me why the density of states in 2D and 1D includes a step function? I have calculated the DOS in 2D to be:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]

D_2(E) = \frac{m_e}{\pi \hbar^2}

[/tex]

but in my book there a sum over step functions included so that the expression is:

[tex]

D_2(E) = \frac{m_e}{\pi \hbar^2} \sum_m \theta(E - E_m).

[/tex]

What does that step function do? It has something to do with the fact that there are a number of quantized states too right?

Thanks

**Physics Forums - The Fusion of Science and Community**

# Density of states

Know someone interested in this topic? Share a link to this question via email,
Google+,
Twitter, or
Facebook

Have something to add?

- Similar discussions for: Density of states

Loading...

**Physics Forums - The Fusion of Science and Community**