Dear MPB users and developers. I was little confused after observation dispersion curves of 2D hexagonal photonic crystal. Maximum k-vector value at Gamma-K direction was 0.47 (2pi/a), not 0.5 (2pi/a). I guess the cuase of this in MPB example code*: "(set! k-points (list (vector3 0 0 0) ; Gamma
(vector3 0 0.5 0) ; M (vector3 (/ -3) (/ 3) 0) ; K (vector3 0 0 0))) ; Gamma (set! k-points (interpolate 4 k-points))" Gamma-K vector length is (2*(1/3)^2)^0.5=0.471 My question is: Why K point was set (vector3 (/ -3) (/ 3) 0) not (vector3 (/ -0.5 (sqrt 2)) (/ 0.5 (sqrt 2)) 0)? *URL: http://ab-initio.mit.edu/wiki/index.php/MPB_User_Tutorial#Bands_of_a_Triangular_Lattice Alex Friman, LPI RAS _______________________________________________ mpb-discuss mailing list mpb-discuss@ab-initio.mit.edu http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/mpb-discuss