Cited by 910Photorefractive and Nonlinear OpticsTopological Materials and PhenomenaLaser-Matter Interactions and Applications

Second-order optical response in semiconductors

Sipe, J. E., Shkrebtii, A. I.·2000·Physical Review B

Abstract

We present a new general formalism for investigating the second-order optical response of solids, and illustrate it by deriving expressions for the second-order susceptibility tensor ${\ensuremath{\chi}}_{2}(\ensuremath{-}{\ensuremath{\omega}}_{\ensuremath{\Sigma}};{\ensuremath{\omega}}_{\ensuremath{\beta}},{\ensuremath{\omega}}_{\ensuremath{\gamma}}),$ where ${\ensuremath{\omega}}_{\ensuremath{\Sigma}}={\ensuremath{\omega}}_{\ensuremath{\beta}}+{\ensuremath{\omega}}_{\ensuremath{\gamma}},$ for clean, cold semiconductors in the independent particle approximation. Based on the identification of a polarization operator $\mathbf{P}$ that would be valid even in a more complicated many-body treatment, the approach avoids apparent, unphysical divergences of the nonlinear optical response at zero frequency that sometimes plague such calculations. As a result, it allows for a careful examination of $\mathit{actual}$ divergences associated with physical phenomena that have been studied before, but not in the context of nonlinear optics. These are (i) a coherent current control effect called ``injection current,'' or ``circular photocurrent,'' and (ii) photocurrent due to the shift of the center of electron charge in noncentrosymmetric materials in the process of optical excitation, called ``shift current.'' The expressions we present are amenable for numerical calculations, and we demonstrate this by performing a full band-structure calculation of the shift current coefficient for GaAs.

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Crossref · 10.1103/physrevb.61.5337

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  • Circular injection currents can occur within 18 of the 21 noncentrosymmetric crystal classes, but are forbidden for zincblende and certain other crystals due to antisymmetry under permutation of the last two coordinates.

    “Circular injection currents, for instance, can occur within 18 of the 21 noncentrosymmetric crystal classes, but are forbidden for (zincblende), , and crystals, due to the antisymmetry of under permutation of the last two coordinates42.”
  • Injection currents involve asymmetric carrier excitation in k-space with a net group velocity, due to helicity-dependent quantum interference between different polarization components of a circularly polarized excitation beam.

    “Injection currents, on the other hand, involve asymmetric carrier excitation in -space with a net group velocity, due to helicity-dependent quantum interference between different polarization components of a circularly polarized excitation beam42,43.”

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Authors
Sipe, J. E., & Shkrebtii, A. I.
Affiliations
University of Toronto (CA)
Venue
Physical Review B
Published
2000-02-15
Volume
61
Issue
8
Pages
5337-5352
ISSN
  • 0163-1829 (ISSN-L)
  • 1095-3795
OpenAlex
W2060827848
Cited by
910
References
33
Citations by year
2026: 109 · 2025: 128 · 2024: 97 · 2023: 89 · 2022: 73 · 2021: 102 · 2020: 69 · 2019: 52 · 2018: 30 · 2017: 23 · 2016: 18 · 2015: 17 · 2014: 14 · 2013: 11 · 2012: 8
FWCI
3.53
Type
journal article
Language
en
Open access
closed
Locations
Physical review. B, Condensed matter (publishedVersion)
Funders
Natural Sciences and Engineering Research Council of Canada
Topics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Photorefractive and Nonlinear Optics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Topological Materials and Phenomena
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Laser-Matter Interactions and Applications
Keywords
second-order nonlinear susceptibility, nonlinear optics, semiconductors, polarization operator, injection current, shift current, noncentrosymmetric materials, GaAs, electronic band structure, independent particle approximation

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