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Symmetry considerations are of extreme importance to the topologicalproperties of crystals. A crystal field splitting {\delta} yields Dirac nodesnear the Brillouin zone center in Cd3As2, but its value has yet to bedetermined with precision. We study the band structure of Cd3As2 usingmagnetooptical infrared spectroscopy measurements on epilayers with low carrierdensity grown by molecular beam epitaxy. By combining angular dependentcyclotron resonance with Landau level spectroscopy measurements in the Faradaygeometry, we determine that {\delta} is positive and equal to 15+/-5 meV inCd3As2. Our results lead to a more accurate knowledge of the details of theband structure of this Dirac semimetal such as the position its Dirac nodes inmomentum space and their splitting into Weyl nodes under a magnetic field.

Determination of the crystal field splitting energy in Cd3As2 using magnetooptics