Magneto-optical probe of the fully gapped Dirac band in ZrSiS

Abstract

We present a far-infrared magneto-optical study of the gapped nodal-line semimetal ZrSiS in magnetic fields $B$ up to 7 T. The observed field-dependent features, which represent intra- (cyclotron resonance) and interband transitions, develop as $\sqrt{B}$ in increasing field and can be consistently explained within a simple 2D Dirac band model with a gap of 26 meV and an averaged Fermi velocity of $3\times 10^5$ m/s. This indicates a rather narrow distribution of these parameters along the in-plane portions of the nodal line in the Brillouin zone. A field-induced feature with an energy position that does not depend on $B$ is also detected in the spectra. Possible origins of this feature are discussed.

accepted to Phys. Rev. Research

References in corpus (11)

• Topological nodal line semimetals
• Potential ring of Dirac nodes in a new polymorph of Ca${}_3$P${}_2$
• Observation of an intrinsic bandgap and Landau level renormalization in graphene/boron-nitride heterostructures
• Dirac Line-nodes and Effect of Spin-orbit Coupling in Non-symmorphic Critical Semimetal MSiS (M=Hf, Zr)
• Use of X-ray scattering functions in Kramers-Kronig analysis of reflectance
• Spectroscopic evidence for bulk-band inversion and three-dimensional massive Dirac fermions in ZrTe5
• Flat optical conductivity in ZrSiS due to two-dimensional Dirac bands
• Surface floating 2D bands in layered nonsymmorphic semimetals: ZrSiS and related compounds
• Colossal infrared and terahertz magneto-optical activity in a two-dimensional Dirac material
• Observation of Effective Pseudospin Scattering in ZrSiS
• Classical to quantum crossover of the cyclotron resonance in graphene: A study of the strength of intraband absorption