2013/07/31 by É. V. Gorbar, E. V. Gorbar, V. A. Miransky +1 · 66 citations
Materials Science · Physics and Astronomy · #Band gap #Chiral anomaly #Condensed matter physics #Critical field #Dirac (video compression format) #Field (mathematics) #Gapless playback #Graphene research and applications #Landau quantization #Magnetic field #Magnetic monopole #Phase (matter) #Phase diagram #Phase transition #Physics #Quantum Mechanics and Non-Hermitian Physics #Quantum mechanics #Quasiparticle #Semimetal #Superconductivity #Topological Materials and Phenomena #Weyl semimetal #cond-mat.mes-hall #hep-ph #hep-th #nucl-th
paper · pdf · doi:10.1103/physrevb.88.165105
published in Physical Review B 88(16) (American Physical Society) · 8 pages, 1 figure; published version with new references added
openalex publication_date 2013/10/04 · arxiv created 2013/10/07 · arxiv updated 2013/10/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study the phase diagram of a Dirac semimetal in a magnetic field at a nonzero charge density. It is shown that there exists a critical value of the chemical potential at which a first-order phase transition takes place. At subcritical values of the chemical potential the ground state is a gapped state with a dynamically generated Dirac mass and a broken chiral symmetry. The supercritical phase is the normal (gapless) phase with a nontrivial chiral structure: it is a Weyl semimetal with a pair of Weyl nodes for each of the original Dirac points. The nodes are separated by a dynamically induced chiral shift. The direction of the chiral shift coincides with that of the magnetic field and its magnitude is determined by the quasiparticle charge density, the strength of the magnetic field, and the strength of the interaction. The rearrangement of the Fermi surface accompanying this phase transition is described.