Figure 7: Sorting of eigensurfaces.
From: Engineering thermal conductance using a two-dimensional phononic crystal
Low energy spectral branches of a 2D PnC with circular hole perforations plotted over the irreducible BZ (IBZ). (a) Unsorted surfaces 
, which provide incorrect group velocity data at k-values where the surfaces intersect. (b) Sorted surfaces, which correspond to the eigenmodes continuous in k. (c) Relative error in P(T) for a full membrane with d=485 nm for various IBZ grid sizes, when eigensurface sorting is neglected. Eigensurfaces were calculated up to 70 GHz.
