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Enhanced Dirac node separation in strained Cd3As2 topological semimetal by Krizman, Gauthier; Bermejo-Ortiz, Joaquin; Goyal, Manik; Lygo, Alexander C.; Wang, Jiashu; Zhang, Zhan; Assaf, Badih A.; Stemmer, Susanne; de Vaulchier, Louis-Anne; Guldner, Yves is a scholarly article available to read on EtoBox.

What is Enhanced Dirac node separation in strained Cd3As2 topological semimetal about?

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.

Author

Krizman, Gauthier; Bermejo-Ortiz, Joaquin; Goyal, Manik; Lygo, Alexander C.; Wang, Jiashu; Zhang, Zhan; Assaf, Badih A.; Stemmer, Susanne; de Vaulchier, Louis-Anne; Guldner, Yves

Published

2022

Language

EN