Implications of second harmonic generation for hidden order in 
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Torre, A. de la; Matteo, S. Di; Hsieh, David; Norman, M. R.

doi:10.1103/physrevb.104.035138

Cited by 4 publications

(1 citation statement)

References 37 publications

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“…Further, the SHG is another second order nonlinear optical response, where the material absorbs a light with frequency ω and produces a light with doubled frequency 2ω, [9][10][11][12]. The symmetry structure of SHG tensor provides important information about the subtle broken symmetries in materials [13,14], which may not be obvious in linear response probes. Although the basic principles of these nonlinear responses are well understood [9,15,16], it is highly valuable to investigate materials that may provide strong nonlinear optical responses.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear optical responses in nodal line semimetals

Tavakol¹,

Kim²

2022

Preprint

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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.

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Section: Introductionmentioning

confidence: 99%

Nonlinear optical responses in nodal line semimetals

Tavakol¹,

Kim²

2022

Preprint

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Comparing first-principles density functionals plus corrections for the lattice dynamics of YBa2Cu3O6

Ning,

Lane,

Barbiellini

et al. 2024

The Journal of Chemical Physics

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The enigmatic mechanism underlying unconventional high-temperature superconductivity, especially the role of lattice dynamics, has remained a subject of debate. Theoretical insights have long been hindered due to the lack of an accurate first-principles description of the lattice dynamics of cuprates. Recently, using the r2SCAN meta-generalized gradient approximation (meta-GGA) functional, we have been able to achieve accurate phonon spectra of an insulating cuprate YBa2Cu3O6 and discover significant magnetoelastic coupling in experimentally interesting Cu–O bond stretching optical modes [Ning et al., Phys. Rev. B 107, 045126 (2023)]. We extend this work by comparing Perdew–Burke–Ernzerhof and r2SCAN performances with corrections from the on-site Hubbard U and the D4 van der Waals (vdW) methods, aiming at further understanding on both the materials science side and the density functional side. We demonstrate the importance of vdW and self-interaction corrections for accurate first-principles YBa2Cu3O6 lattice dynamics. Since r2SCAN by itself partially accounts for these effects, the good performance of r2SCAN is now more fully explained. In addition, the performances of the Tao–Mo series of meta-GGAs, which are constructed in a different way from the strongly constrained and appropriately normed (SCAN) meta-GGA and its revised version r2SCAN, are also compared and discussed.

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Direct visualization and control of antiferromagnetic domains and spin reorientation in a parent cuprate

Seyler

Ron

et al. 2022

Phys. Rev. B

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We report magnetic optical second-harmonic generation (SHG) polarimetry and imaging on Sr2Cu3O4Cl2, which allows direct visualization of the mesoscopic antiferromagnetic (AFM) structure of a parent cuprate. Temperature-and magnetic-field-dependent SHG reveals large domains with 90 • relative orientations that are stabilized by a combination of uniaxial magnetic anisotropy and the Earth's magnetic field. Below a temperature T R ∼ 97 K, we observe an unusual 90 • spin reorientation transition, possibly driven by competing magnetic anisotropies of the two copper sublattices, which swaps the AFM domain states while preserving the domain structure. This allows deterministic switching of the AFM states by thermal or laser heating. Near T R , the domain walls become exceptionally responsive to an applied magnetic field, with the Earth's field sufficient to completely expel them from the crystal. Our findings unlock opportunities to study the mesoscopic AFM behavior of parent cuprates and explore their potential for AFM technologies.

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Implications of second harmonic generation for hidden order in Sr2CuO2Cl2

Cited by 4 publications

References 37 publications

Nonlinear optical responses in nodal line semimetals

Nonlinear optical responses in nodal line semimetals

Comparing first-principles density functionals plus corrections for the lattice dynamics of YBa2Cu3O6

Direct visualization and control of antiferromagnetic domains and spin reorientation in a parent cuprate

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