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VOLUME 80 (2004) | ISSUE 5 | PAGE 389
Quantum phase transition for the BEC-BCS crossover in condensed matter physics and CPT violation in elementary particle physics
PACS: 11.30.Er, 71.10.-w, 73.43.Nq
Abstract
We discuss the quantum phase transition which separates a vacuum state with fully-gapped fermion spectrum from a vacuum state with topologically-protected Fermi points (gap nodes). In the context of condensed-matter physics, such a quantum phase transition with Fermi point splitting may occur for a system of ultracold fermionic atoms in the region of the BEC-BCS crossover, provided the Cooper pairing occurs in the non-s-wave channel. For elementary particle physics, the splitting of Fermi points may lead to CPT violation, neutrino oscillations, and other phenomena.