Determination of the crystal field splitting energy in Cd3As2 using magnetooptics

Abstract

Symmetry considerations are of extreme importance to the topological properties of crystals. A crystal field splitting δ yields Dirac nodes near the Brillouin zone center in Cd3As2, but its value has yet to be determined with precision. We study the band structure of Cd3As2 using magnetooptical infrared spectroscopy measurements on epilayers with low carrier density grown by molecular beam epitaxy. By combining angular dependent cyclotron resonance with Landau level spectroscopy measurements in the Faraday geometry, we determine that δ is positive and equal to 15+/-5 meV in Cd3As2. Our results lead to a more accurate knowledge of the details of the band structure of this Dirac semimetal such as the position its Dirac nodes in momentum space and their splitting into Weyl nodes under a magnetic field.

arXiv commentAccepted Phys Rev B

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Cited by in corpus (5)

• Soft phonons and ultralow lattice thermal conductivity in the Dirac semimetal Cd3As2
• Quantum Hall effect induced by chiral Landau levels in topological semimetal films
• Evidence of decoupling of surface and bulk states in Dirac semimetal $C{d}_{3}A{s}_2$
• Enhanced Dirac node separation in strained Cd3As2 topological semimetal
• Effects of anisotropy on the high field magnetoresistance of Weyl semimetals