Optical second-harmonic generation from magnetized surfaces

Pan, Ru‐Pin; Wei, Hao-Keng; Shen, Y. R.

doi:10.1103/physrevb.39.1229

Cited by 346 publications

(203 citation statements)

References 19 publications

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“…However inversion-symmetric systems in bulk might display second non-linear optical responses due to the lack of inversion symmetry at the surface. Moreover, such surface second responses might depend on the externally applied magnetic field as well 39 . We have to add this unknown optical responses to the ones described in the present work if we want to correctly characterize the SHG wave.…”

Section: Discussionmentioning

confidence: 99%

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Magnetic-field-induced nonlinear optical responses in inversion symmetric Dirac semimetals

Cortijo

2016

Phys. Rev. B

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We show that, under the effect of an external magnetic field, a photogalvanic effect and the generation of second harmonic wave can be induced in inversion-symmetric and time reversal invariant Dirac semimetals and it is linear with the magnetic field. The mechanisms responsible of these non linear optical responses is the magnetochiral effect and the chiral magnetic effect. What makes possible that these two effects give rise to the discussed non linear optical effects is the presence of band bending effects in the dispersion relation in real Dirac semimetals. Some observable consequences of this phenomenon are the appearance of a dc current on the surface of the system when it is irradiated with linearly polarized light or a rotation of the polarization plane of the reflected second harmonic wave.

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Section: Discussionmentioning

confidence: 99%

“…We content ourselves with the computation of the expression (39). When (B ⊥ b), the circular SHG current turns out to be the same as (33).…”

Section: Second Harmonic Generation In Dirac Semimetalsmentioning

confidence: 99%

Magnetic-field-induced nonlinear optical responses in inversion symmetric Dirac semimetals

Cortijo

2016

Phys. Rev. B

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“…In the case of energy dissipation or presence of resonance states the interference term can appear similar to the interference of crystallographic and magnetic contributions in the SHG process. 11,55 A microscopic quantummechanical model, developed in Sec. V, considers a general third order polarization for the IED and CED contributions, therefore the phase is preserved for the entire spectral range and the interference term in Eq.…”

Section: ͑4͒mentioning

confidence: 99%

Optical third-harmonic spectroscopy of the magnetic semiconductor EuTe

et al. 2010

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EuTe possesses the centrosymmetric crystal structure m3m of rocksalt type in which the second-harmonic generation is forbidden in electric dipole approximation but the third-harmonic generation ͑THG͒ is allowed. We studied the THG spectra of this material and observed several resonances in the vicinity of the band gap at 2.2-2.5 eV and at higher energies up to 4 eV, which are related to four-photon THG processes. The observed resonances are assigned to specific combinations of electronic transitions between the ground 4f 7 state at the top of the valence band and excited 4f 6 5d 1 states of Eu 2+ ions, which form the lowest energy conduction band. Temperature, magnetic field, and rotational anisotropy studies allowed us to distinguish crystallographic and magnetic-field-induced contributions to the THG. A strong modification of THG intensity for the 2.4 eV band and suppression of the THG for the 3.15 eV band was observed in applied magnetic field. Two main features of the THG spectra were assigned to 5d͑t 2g ͒ and 5d͑e g ͒ subbands at 2.4 eV and 3.15 eV, respectively. A microscopic quantum-mechanical model of the THG response was developed and its conclusions are in qualitative agreement with the experimental results.

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“…The presence of a magnetization does not influence the bulk inversion symmetry but changes the symmetry at the interface, making MSHG probing also interface sensitive. 6 For an isotropic ͓or ͑001͔͒ surface the nonlinear magneto-optical tensor elements contributing to the total second harmonic signal are given in Table I.…”

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confidence: 99%

CoNi/Pt interface roughness probed by nonlinear magneto-optics, x-ray scattering and atomic force microscopy

Bal

Kirilyuk

Rasing

et al. 2001

Journal of Applied Physics

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The crystallographic contribution of the nonlinear magneto-optical response from CoNi/Pt interfaces appears to scale linearly with increasing interface roughness as determined by small angle x-ray scattering and atomic force microscopy. From the magnetic contribution it follows that the increased interface roughness causes the interface moment to turn out of plane while the bulk of the film has an in-plane magnetization.

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Optical second-harmonic generation from magnetized surfaces

Cited by 346 publications

References 19 publications

Magnetic-field-induced nonlinear optical responses in inversion symmetric Dirac semimetals

Magnetic-field-induced nonlinear optical responses in inversion symmetric Dirac semimetals

Optical third-harmonic spectroscopy of the magnetic semiconductor EuTe

CoNi/Pt interface roughness probed by nonlinear magneto-optics, x-ray scattering and atomic force microscopy

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