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Article Dans Une Revue Physical Review B Année : 2022

Enhanced Dirac node separation in the strained Cd 3 As 2 topological semimetal

J. Bermejo-Ortiz
  • Fonction : Auteur
A. Lygo
  • Fonction : Auteur
S. Stemmer
L. A de Vaulchier
Y. Guldner
  • Fonction : Auteur

Résumé

In topological semimetals, nodes appear at symmetry points in the Brillouin zone as a result of band inversion, and yield quasi-relativistic massless fermions at low energies. Cd3As2 is a three-dimensional topological semimetal that hosts two Dirac cones responsible for a variety of quantum phenomena. In this work, we demonstrate the strain tuning of the Dirac nodes of Cd3As2 through a combination of magnetooptical infrared spectroscopy and high-resolution X-ray diffraction studies performed on epitaxial films. In these thin films, we observe a giant enhancement of the node separation in momentum space by close to a factor of 4. A combination of experimental measurements and theoretical modelling allows relate the origin of this enhancement to a strengthening of the topological band inversion driven by lattice strain. Our results demonstrate how strain can be used as a knob to tune the topological properties of semimetals and to potentially enhance their performance and response for various applications.

Dates et versions

hal-03814570 , version 1 (14-10-2022)

Identifiants

Citer

G. Krizman, J. Bermejo-Ortiz, M. Goyal, A. Lygo, J. Wang, et al.. Enhanced Dirac node separation in the strained Cd 3 As 2 topological semimetal. Physical Review B, 2022, 106 (16), pp.165202. ⟨10.1103/PhysRevB.106.165202⟩. ⟨hal-03814570⟩
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