We calculate by the proper-time method the amplitude of the two-photon emission by a charged fermion in a constant magnetic field in (2+ 1) -dimensional space-time. The relevant dynamics reduces to that of a supersymmetric quantum-mechanical system with one bosonic and one fermionic degrees of freedom.
Physical review. D, Particles, fields, gravitation, and cosmology. College Park. Vol. 72, no. 8 (Oct. 2005), 085019 9p.