- #1
humanist rho
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Homework Statement
Tha band structure of a simple cubic lattice is given by,
[itex]E = E_{0}-A(\cos k_{x}a+\cos k_{y}a+\cos k_{z}a)[/itex]
where a is the lattice constant and A is a positive constant.
Find the effective mass for the electron at the values of k corresponding to the top and bottom of the band.
Homework Equations
[itex]m^{\ast }=\frac{\hbar ^{2}}{\left( \frac{d^{2}E}{dk^{2}}\right) }[/itex]
The Attempt at a Solution
The components kx,ky,kz and the condition 'top and bottom of the band' are confusing me.
Is these top and bottom correspond to brollouin zone edges?
How can i put these components of k in above equation?
Thanks.