where n x and n y are normalized fields subject to n has two eigen-spinors with the eigen-energy E corresponding to the filled band is given by the spinor ± 2 x + n 2 y = 1. It =±|R|. The state
where nxand nyare normalized fields subject to nhas two eigen-spinors with the eigen-energy Ecorresponding to the filled band is given by the spinor±2x+ n2y= 1. It =±|R|. The state