Prediction of a Weyl semimetal in Hg 1 - X - Y Cd x Mn y Te

Daniel Bulmash, Chao Xing Liu, Xiao Liang Qi

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96 Scopus citations

Abstract

We study strained Hg1-x-yCdxMnyTe in a magnetic field using a k·p model and predict that the system is a Weyl semimetal with two nodes in an experimentally reasonable region of the phase diagram. We also predict two signatures of the Weyl semimetal phase which arise from tunability of the Weyl node splitting. First, we find that the Hall conductivity is proportional to the average Mn ion spin and thus is strongly temperature dependent. Second, we find an unusual magnetic field angle dependence of the Hall conductivity; in particular, we predict a peak in σxy as a function of field angle in the xz plane and a finite σyz as the x component of the field goes to zero.

Original languageEnglish (US)
Article number081106
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number8
DOIs
StatePublished - Feb 11 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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