Figure 1

Figure 1: (a) Two classical paths connecting arbitrary points A and B in a two-dimensional disordered conductor. (b) A pair of closed paths that contribute to the weak localization correction. (c) In a single scattering event, a long-range potential is unable to scatter chiral quasiparticles in the backwards direction (upper left) because it can’t reverse the pseudospin direction (black arrows), whereas scattering in the forwards or sideways direction (lower right) is allowed [15].