Fig. 3. (a) Schrödinger’s fermions; the green dot is the electron. (b) Dirac fermions in graphene. Reproduced with permission of Science Review, 324, 1531 (2009).

Fig. 3. (a) Schrödinger’s fermions; the green dot is the electron. (b) Dirac
fermions in graphene. Reproduced with permission of Science Review, 324,
1531 (2009).