  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.
