2 papers
math-ph2001
The Spherical Landau Problem
Cesar Castilho, Andre Penna-Firme
The magnetization for electrons on a two-dimensional sphere, under a spherically symmetrical normal magnetic field has been studied in the large field limit. This allows us to use…
hep-th1998
Anti-symmetric Tensor Matter Fields and Non-Linear Sigma-Model
M. G. Negrao, A. Penna-Firme, J. A. Helayel-Neto
The equivalence between rank-2 anti-symmetric tensor fields, considered as gauge potentials, and torsionless non-linear -models suggests us to study the possibility of coupling…