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Weyl Semimetal in the Strong Coulomb Interaction Limit

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arxiv 1309.1079 v3 pith:4Q7C5DFJ submitted 2013-09-04 cond-mat.str-el cond-mat.mes-hallhep-lathep-ph

Weyl Semimetal in the Strong Coulomb Interaction Limit

classification cond-mat.str-el cond-mat.mes-hallhep-lathep-ph
keywords strongcouplinglimitsemimetalweylcoulombsystembroken
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We study the effects of strong $1/r$ long-range Coulomb interactions in a Weyl semimetal. We consider a three-dimensional (3D) Dirac fermion system on a lattice with a time-reversal symmetry breaking term, and take into account $1/r$ long-range Coulomb interactions between the bulk electrons. This model is regarded as the case where magnetic impurities are doped into the bulk of a 3D topological insulator. With the use of the strong coupling expansion of the lattice gauge theory and the mean-field approximation, we analyze the system from the strong coupling limit. It is shown that parity symmetry of the system is spontaneously broken in the strong coupling limit, and a different type of the Weyl semimetal, in which time-reversal and parity symmetries are broken, appears in the strong coupling limit. A possible global phase diagram of a correlated Weyl semimetal is presented.

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