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Theory of a 3+1D fractional chiral metal: interacting variant of the Weyl semimetal by Meng, Tobias; Grushin, Adolfo G.; Shtengel, Kirill; Bardarson, Jens H. is a scholarly article available to read on EtoBox.

What is Theory of a 3+1D fractional chiral metal: interacting variant of the Weyl semimetal about?

Formulating consistent theories describing strongly correlated metallic topological phases is an outstanding problem in condensed matter physics. In this work we derive a theory defining a fractionalized analogue of the Weyl semimetal state: the fractional chiral metal. Our approach is to construct a 4+1D quantum Hall insulator by stacking 3+1D Weyl semimetals in a magnetic field. In a strong enough field the low-energy physics is determined by the lowest Landau level of each Weyl semimetal, which is highly degenerate and chiral, motivating us to use a coupled-wire approach. The one-dimensional dispersion of the lowest Landau level allows us to model the system as a set of degenerate 1+1D quantum wires that can be bosonized in the presence of electron-electron interactions and coupled such that a gapped phase is obtained, whose response to an electromagnetic field is given in terms of a Chern-Simons field theory. At the boundary of this phase we obtain the field theory of a 3+1D gapless fractional chiral state, which we show is consistent with a previous theory for the surface of a 4+1D Chern-Simons theory. The boundary's response to an external electromagnetic field is determined

Author

Meng, Tobias; Grushin, Adolfo G.; Shtengel, Kirill; Bardarson, Jens H.

Published

2016

Language

EN