Nonlinear optical responses in nodal line semimetals

Abstract

Shift current and second harmonic generation (SHG) are nonlinear optical responses that are often used for photovoltaic effect and the detection of subtle symmetry breaking patterns in materials. It has been recently shown that topological semimetals such as Weyl semimetals with broken inversion symmetry can generate large nonlinear optical responses. In this paper, we investigate both shift current and SHG in a class of topological nodal line semimetal (NLSM) systems with broken inversion symmetry, which may arise intrinsically or via an applied electric field. It is shown that certain classes of NLSM systems offer more singular shift current and SHG in comparison to the well-known Weyl semimetal systems.

9 pages, 1 figure, 3 tables

References in corpus (8)

• Topological nodal line semimetals
• Photocurrents in Weyl semimetals
• Linear magneto-electric phase in ultrathin MnPS${}_3$ probed by optical second harmonic generation
• Chiral anomaly induced nonlinear Hall effect in multi-Weyl semimetals
• Spin-triplet superconductivity in Weyl nodal-line semimetals
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• Implications of second harmonic generation for hidden order in Sr${}_2$CuO${}_2$Cl${}_2$
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Cited by in corpus (3)

• Two-dimensional Topological Ferroelectric Metal with Giant Shift Current
• Nonlinear Optical Spectroscopy of Nodal-Line Semimetals
• Probing imbalanced Weyl nodes in two-dimensional anisotropic Weyl semimetal via optical conductivity