Is Bi2Te3 (intrinsic, no doped) a direct or indirect band gap semiconductor ?

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Andriy Lotnyk

Bi2Te3 has a direct band gap at the G k-point.

Best regards,

Andriy

Denghui Ji

A direct band gap .

Gourab Das

It is controversial. At some point it is direct band gap and other point it seems to an indirect band gap. Please go through this article.

10.1103/PhysRevB.90.075105

Franklin Uriel Parás Hernández

Gourab Das:

I see!

Does this mean that the gap between the valence band and the conduction band at some points of k (k vector) has a direct band transition, and at other values of k the gap transition is indirect?

Regards !