Author Topic: k-point units in bandstructure data  (Read 187 times)

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Offline ams_nanolab2

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k-point units in bandstructure data
« on: November 7, 2019, 13:08 »
Hi, Could you tell me what's the units of k-points in the bandstructure output data? What I see in the first column is a normalized length for the entire BZ sampling path, and in the third and subsequesnt columns the fractional k-point coordinates. What is the unit of these fractional co-ordinates (like  (2pi/Ang) or (1/Ang) , (kL/pi) or something else?)

Offline Petr Khomyakov

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Re: k-point units in bandstructure data
« Reply #1 on: November 7, 2019, 14:42 »
Fractional coordinates do not have units by definition, as you may also see when viewing a band structure object in Text Representation. The K-point fractional coordinates are given in the coordinate system of three reciprocal lattice vectors, in terms of fractions of those vectors. 

The Cartesian coordinates are in units of 1/Angstrom,  as can be seen in  Text Representation of the band structure object.