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Pseudo-magnetic fields in graphene in excess of 300T: theoretical framework

The experimental demonstration of pseudo-magnetic fields exceeding 300 T in graphene [2] nanobubbles represents considerable challenge for the present theory connecting the emergence of gauge fields due to strain in the underlying lattice. Here we propose a theoretical framework within which the magnitude of the pseudo-magnetic fields can be computed more accurately. The basic feature of this framework is that the carriers in graphene are considered with their three dimensional wave function which is then gradually constrained to the graphene surface. In the process, a geometrically induced gauge field emerges in the two dimensional equation for the surface dynamics. The computation of the magnetic field associated with this gauge potential reproduces the measured field strength.