Half-integer point defects in the $Q$-tensor theory of nematic liquid   crystals
  We investigate prototypical profiles of point defects in two dimensional liquid crystals within the framework of Landau-de Gennes theory. Using boundary conditions characteristic of defects of index $k/2$, we find a critical point of the Landau-de Gennes energy that is characterised by a system of ordinary differential equations. In the deep nematic regime, $b^2$ small, we prove that this critical point is the unique global minimiser of the Landau-de Gennes energy. We investigate in greater detail the regime of vanishing elastic constant $L \to 0$, where we obtain three explicit point defect profiles, including the global minimiser. 
G. Di Fratta, JM Robbins, V. Slastikov and A. Zarnescu
math.AP cond-mat.mtrl-sci nlin.PS