Collective modes and Kosterlitz-Thouless transition in a magnetic field in the planar Nambu--Jona-Lasino model

Abstract

It is known that a constant magnetic field is a strong catalyst of dynamical chiral symmetry breaking in 2+1 dimensions, leading to generating dynamical fermion mass even at weakest attraction. In this work we investigate the collective modes associated with the dynamical chiral symmetry breaking in a constant magnetic field in the (2+1)-dimensional Nambu--Jona-Lasinio model with continuous U(1) chiral symmetry. We introduce a self-consistent scheme to evaluate the propagators of the collective modes at the leading order in 1/N. The contributions from the vacuum and from the magnetic field are separated such that we can employ the well-established regularization scheme for the case of vanishing magnetic field. The same scheme can be applied to the study of the next-to-leading order correction in 1/N. We show that the sigma mode is always a lightly bound state with its mass being twice the dynamical fermion mass for arbitrary strength of the magnetic field. Since the dynamics of the collective modes is always 2+1 dimensional, the finite temperature transition should be of the Kosterlitz-Thouless (KT) type. We determine the KT transition temperature $T_{\mathrm{KT}}$ as well as the mass melting temperature $T^{\ast }$ as a function of the magnetic field. It is found that the pseudogap domain $T_{\mathrm{KT}}<T<T^{\ast }$ is enlarged with increasing strength of the magnetic field. The influence of a chiral imbalance or axial chemical potential ${\mu }_5$ is also studied. We find that even a constant axial chemical potential ${\mu }_5$ can lead to inverse magnetic catalysis of the KT transition temperature in 2+1 dimensions. The inverse magnetic catalysis behavior is actually the de Haas--van Alphen oscillation induced by the interplay between the magnetic field and the Fermi surface.

15 pages, 4 figures, published version

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• Chiral phase transition and spin alignment of vector mesons with chiral imbalance in a rotating QCD medium
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• Gauge independence of pion masses in a magnetic field within the Nambu--Jona-Lasinio model