In a degenerate system, for calculating the DOS effective mass, how can we find the degeneracy and also how can we determine the three directions (one longitudinal and one transverse) at the VBM. For DOS effective mass only one band is enough or do we need to consider the average of the degenerate bands. I have attatched a file of bandstructure which shows VBM at X (Source: Y. O. Ciftci, S. D. Mahanti, ‘Electronic structure and thermoelectric properties of half-Heusler compounds with eight electron valence count KScX (X = C and Ge)’ J. Appl. Phys. 119, 145703 (2016) What will be the three directions and degeneracy for this particular bandstructure.
Dear
to find the desired directions, you should consult your reciprocal lattice (1 st BZ). the x direction is the direction along the [100] direction (the Kx vector). the y direction is the direction along the [010] direction (the Ky vector) ....
for examlpe we can see that along the X-W direction there are 2 possible values for the hole effective mass (mt).
Mohamed Ali Lahmer Thankyou Sir for your reply. Along X-W how can we take the K- points from the data file because in the X-W direction if we consider the heavy hole band (band 1), then we get same value of effective mass if we take the same number of K -points for non-linear fitting.
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