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Title: Collective modes and Kosterlitz-Thouless transition in a magnetic field in the planar Nambu–Jona-Lasinio model

Journal Article · · Physical Review. D, Particles, Fields, Gravitation and Cosmology
 [1];  [2];  [1]
  1. Tsinghua Univ. and Collaborative Innovation Center of Quantum Matter, Beijing (China)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Frankfurt Institute for Advanced Studies, Frankfurt am Main (Germany)

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 TKT as well as the mass melting temperature T* as a function of the magnetic field. It is found that the pseudogap domain TKT < T < T* is enlarged with increasing strength of the magnetic field. The influence of a chiral imbalance or axial chemical potential μ5 is also studied. We find that even a constant axial chemical potential μ5 can lead to inverse magnetic catalysis of the KT transition temperature in 2+1 dimensions. As a result, 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.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
11335005; 2013CB922000; 2014CB845400; AC52-06NA25396
OSTI ID:
1246920
Alternate ID(s):
OSTI ID: 1181465
Report Number(s):
LA-UR-14-26175; PRVDAQ
Journal Information:
Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 90, Issue 5; ISSN 1550-7998
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 29 works
Citation information provided by
Web of Science

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Novel quantum phenomena induced by strong magnetic fields in heavy-ion collisions journal January 2017
Electromagnetic fields and anomalous transports in heavy-ion collisions—a pedagogical review journal June 2016
Quark–hadron phase structure, thermodynamics, and magnetization of QCD matter journal April 2018
Magnetic catalysis effect prevents vacuum superconductivity in strong magnetic fields journal October 2019
Rotation induced charged pion condensation in a strong magnetic field: A Nambu–Jona-Lasino model study journal November 2019
Interplay between superconductivity and chiral symmetry breaking in a ( 2 + 1 )-dimensional model with a compactified spatial coordinate journal May 2015
Competition and duality correspondence between chiral and superconducting channels in ( 2 + 1 )-dimensional four-fermion models with fermion number and chiral chemical potentials journal May 2016
Thermo-magnetic effects in quark matter: Nambu-Jona-Lasinio model constrained by lattice QCD journal May 2017
Electromagnetic fields and anomalous transports in heavy-ion collisions --- A pedagogical review text January 2015
Rotation induced charged pion condensation in a strong magnetic field: A Nambu--Jona-Lasino model study text January 2019