Journal
PHYSICAL REVIEW B
Volume 88, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.88.165105
Keywords
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Funding
- European FP7 program [SIMTECH 246937]
- SFFR of Ukraine [F53.2/028]
- Grant STCU [5716-2]
- Natural Sciences and Engineering Research Council of Canada
- US National Science Foundation [PHY-0969844]
- Division Of Physics
- Direct For Mathematical & Physical Scien [0969844] Funding Source: National Science Foundation
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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.
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