- #1

Dixanadu

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## Homework Statement

Show that for a simple square lattice (in 2-D) with the lattice spacing = a, the kinetic energy of a free electron at a corner (point A in the figure below) of the first Brillouin zone is higher than that of an electron at the midpoint of a side of the zone (point B in the figure below) by a factor of 2.

http://imageshack.com/a/img856/2000/zuci.jpg

## Homework Equations

No clue

## The Attempt at a Solution

So...like I have no clue about this...has anyone got a hint for me? I don't even know which equations to use...thanks guys...

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