Magneto-Stark Effect of Excitons as the Origin of Second Harmonic Generation in ZnO

Lafrentz, M.; Brunne, D.; Kaminski, B.; Павлов, В. В.; Rodina, A. V.; Pisarev, R. V.; Yakovlev, D. R.; Bakin, A.; Bayer, М.

doi:10.1103/physrevlett.110.116402

Cited by 33 publications

(34 citation statements)

References 25 publications

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“…One im-portant limitation is the existence of forbidden directions in the crystal, where SHG is not allowed due to symmetry reasons. There is a number of ways in which a SHG signal can nevertheless be induced along such a direction [11][12][13][14][15]. In general, a perturbation can break the crystal symmetry and lift this selection rule.…”

Section: Introductionmentioning

confidence: 99%

Second harmonic generation of cuprous oxide in magnetic fields

et al. 2020

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Recently Second Harmonic Generation (SHG) for the yellow exciton series in cuprous oxide has been demonstrated [J. Mund et al., Phys. Rev. B 98, 085203 (2018)]. Assuming perfect O h symmetry, SHG is forbidden along certain high-symmetry axes. Perturbations can break this symmetry and forbidden transitions may become allowed. We investigate theoretically the effect of external magnetic fields on the yellow exciton lines of cuprous oxide. We identify two mechanisms by which an applied magnetic field can induce a second harmonic signal in a forbidden direction. First of all, a magnetic field by itself generally lifts the selection rules. In the Voigt configuration, an additional magneto-Stark electric field appears. This also induces certain SHG processes differing from those induced by the magnetic field alone. Complementary to the manuscript by A. Farenbruch et al. [Phys. Rev. B, submitted], we perform a full numerical diagonalization of the exciton Hamiltonian including the complex valence band structure. Numerical results are compared with experimental data. :2002.12064v1 [cond-mat.mes-hall] arXiv

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Section: Introductionmentioning

confidence: 99%

Second harmonic generation of cuprous oxide in magnetic fields

et al. 2020

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“…On the other hand, optical second-harmonic generation (SHG) is a powerful tool to explore the symmetry of noncentrosymmetric structure19202122. It works especially well when it comes to surface and interface where different media on each side break the inversion symmetry23, and this technique has been applied to probe many interesting and significant aspects of surface and interface, such as molecular absorption, surface electric states, and magnetic domain structure242526.…”

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confidence: 99%

Evolution of structural distortion in BiFeO3 thin films probed by second-harmonic generation

Wang

Jin

Guo

et al. 2016

Sci Rep

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BiFeO3 thin films have drawn much attention due to its potential applications for novel magnetoelectric devices and fundamental physics in magnetoelectric coupling. However, the structural evolution of BiFeO3 films with thickness remains controversial. Here we use an optical second-harmonic generation technique to explore the phase-related symmetry evolution of BiFeO3 thin films with the variation of thickness. The crystalline structures for 60 and 180-nm-thick BiFeO3 thin films were characterized by high-resolution X-ray diffractometry reciprocal space mapping and the local piezoelectric response for 60-nm-thick BiFeO3 thin films was characterized by piezoresponse force microscopy. The present results show that the symmetry of BiFeO3 thin films with a thickness below 60 nm belongs to the point group 4 mm. We conclude that the disappearance of fourfold rotational symmetry in SHG s-out pattern implies for the appearance of R-phase. The fact that the thinner the film is, the closer to 1 the tensor element ratio χ31/χ15 tends, indicates an increase of symmetry with the decrease of thickness for BiFeO3 thin films.

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“…Детальное эксперимен-тальное и теоретическое исследование различных ме-ханизмов, отвечающих за индуцированную магнитным полем ГВГ на экситонных состояниях, было проведено в модельном и хорошо исследованном полупроводнике ZnO [38,39]. Этот кристалл имеет нецентросимметрич-ную кристаллографическую структуру типа вюрцита (то-чечная группа 6mm, пространственная группа P6 3 mc).…”

Section: индуцированная магнитным полем генерация второй оптической гunclassified

“…Очевидно, что это должно быть связано с разной эффективностью соответствующих ме-ханизмов ГВГ. Детальный экспериментальный и теорети-ческий анализ, проведенный в работе [38], показал, что сильный сигнал появляется за счет магнитного эффекта Штарка, который смешивает экситонные состояния 2s и 2p. Магнитный эффект Штарка был предсказан теоре-тически в 1955 году [44] и продемонстрирован экспери-ментально в линейном оптическом отклике экситонов в CdS в 1960 году и позже в Cu 2 O [45][46][47][48].…”

Section: индуцированная магнитным полем генерация второй оптической гunclassified

Международная школа-семинар Экситоны в кристаллах и полупроводниковых наноструктурах", посвященная 120-летию со дня рождения Е. Ф. Гросса, Санкт-Петербург 10-12 октября 2017 года Экситонная спектроскопия полупроводников методом генерации оптических гармоник [1mm] (О б з о р)

Яковлев

Павлов²,

Родина³

et al. 2018

Физика Твердого Тела

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Nonlinear optical phenomena are widely used for the study of semiconductor materials. The paper presents an overview of experimental and theoretical studies of excitons by the method of optical second and third harmonics generation in various bulk semiconductors (GaAs, CdTe, ZnSe, ZnO, Cu_2O, (Cd,Mn)Te, EuTe, EuSe), and low-dimensional heterostructures ZnSe/BeTe. Particular attention is paid to the role of external electric and magnetic fields that modify the exciton states and induce new mechanisms of optical harmonics generation. Microscopic mechanisms of harmonics generation based on the Stark effect, the spin and orbital Zeeman effects, and on the magneto-Stark effect specific for excitons moving in an external magnetic field are considered. This approach makes it possible to study the properties of excitons and to obtain new information on their energy and spin structure that is not available when the excitons are investigated by linear optical spectroscopy. As a result of these studies, a large amount of information was obtained, which allows us to conclude on the establishing of a new field of research—exciton spectroscopy by the method of optical harmonics generation.

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Magneto-Stark Effect of Excitons as the Origin of Second Harmonic Generation in ZnO

Cited by 33 publications

References 25 publications

Second harmonic generation of cuprous oxide in magnetic fields

Second harmonic generation of cuprous oxide in magnetic fields

Evolution of structural distortion in BiFeO3 thin films probed by second-harmonic generation

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