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EuCd_{2}As_{2}: A Magnetic Semiconductor.

D Santos-Cottin1, I Mohelský2, J Wyzula1,2

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This summary is machine-generated.

Europium Cadmium Arsenide (EuCd2As2) is a magnetic semiconductor, not a topological semimetal. An applied magnetic field significantly reduces its band gap but preserves its semiconducting nature.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Europium Cadmium Arsenide (EuCd2As2) has been widely considered a topological semimetal.
  • Previous studies suggested a Weyl phase induced by external magnetic fields.

Purpose of the Study:

  • To experimentally investigate the electronic properties of EuCd2As2.
  • To clarify the material's classification as a semimetal or semiconductor under magnetic fields.

Main Methods:

  • Experimental techniques including electronic transport, optical spectroscopy, and excited-state photoemission spectroscopy.
  • Analysis of band structure modifications under an applied magnetic field.

Main Results:

  • EuCd2As2 exhibits a semiconductor band gap of 0.77 eV.
  • An external magnetic field drastically reduces the band gap (up to 125 meV at 2 T).
  • The material retains its semiconductor characteristics despite magnetic field-induced changes.

Conclusions:

  • EuCd2As2 is definitively a magnetic semiconductor.
  • The material's behavior contradicts its classification as a Dirac or Weyl semimetal.
  • Discrepancy noted with ab initio computations using local spin-density approximation.