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Let's say I have the following material:

http://www2.warwick.ac.uk/fac/sci/physics/current/postgraduate/regs/mpags/ex5/phonons/indirect_absorption/indirect_absorption.bmp

http://www2.warwick.ac.uk/fac/sci/p...s/indirect_absorption/indirect_absorption.bmp

Let the direct band gap be denoted as ω

_{g}. Let's say the temperature is such that it is possible for energies up to ħ(ω+Ω). But since ε(ħ(ω+Ω))<ε(ω

_{g}), can I say that I will only observe appreciable current when I apply a electric field in the direction of +k

_{r}?