  This paper presents a mathematical and numerical analysis of the flatband
wavefunctions occurring in the chiral model of twisted bilayer graphene at the
"magic" twist angles. We show that the chiral model possesses an exact
intra-valley inversion symmetry. Writing the flatband wavefunction as a product
of a lowest Landau level quantum Hall state and a spinor, we show that the
components of the spinor are anti-quantum Hall wavefunctions related by the
inversion symmetry operation introduced here. We then show numerically that as
one moves from the lowest to higher magic angles, the spinor components of the
wavefunction exhibit an increasing number of zeros, resembling the changes in
the quantum Hall wavefunction as the Landau level index is increased. The
wavefunction zeros are characterized by a chirality, with zeros of the same
chirality clustering near the center of the moire unit cell, while opposite
chirality zeros are pushed to the boundaries of the unit cell. The enhanced
phase winding at higher magic angles suggests an increased circulating current.
Physical implications for scanning tunneling spectroscopy, orbital
magnetization and interaction effects are discussed.
