Physics of Semiconductor Devices

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Conduction band electron energy

In silicon, the bottom of the conduction valley along the (100) direction is at (2π/a)(0.85,0,0) where a = 0.543 nm. Electrons in this valley have an anisotropic effective mass. The effective mass in the (100) direction is ml* = 0.98m0 and the effective mass transverse to the [100] direction is mt* = 0.19m0. What is the energy of an electron with a k-vector (2π/a)(0.86,-0.01,0.11)?

E - Ec= eV