electrons able explain anomalous behavior specific heat metals wiedemann franz law ref name hoddeson structure crystalline solids studied max von laue paul knipping observed x ray diffraction pattern crystals concluded crystals get structure periodic lattices atoms ref name hoddeson swiss physicist felix bloch provided wave function solution schr dinger equation periodic potential known bloch 's theorem ref name han ref calculating electronic properties metals solving many body wavefunction often computationally hard hence
Natural science Physics Condensed matter physics