Spontaneous symmetry breaking in a system of strongly interacting   multicomponent fermions (electrons with spin and conducting nanotubes)
  We have calculated the ground state wave functions for a systems of multicomponent interacting fermions. We show that it describes the state with spontaneously broken chiral symmetry. In the limit of an infinitely strong interaction it turns into a phase with a finite density of chiral complexes. The number of particles constituting a complex depends on the number of fermion components. For example, in the case of two component electrons (spin) the condensate is built of four-particle complexes consisting of two "right" electrons and two "left" holes with the opposite spins. 
V. V. Afonin, V. L. Gurevich (A. F. Ioffe Institute of the Russian   Academy of Sciences, Saint Petersburg, Russia) V. Yu. P...