Magnetochiral Anisotropy in Bragg Scattering

Koerdt, C.; Düchs, G.; Rikken, G. L. J. A.

doi:10.1103/physrevlett.91.073902

Cited by 33 publications

(17 citation statements)

References 13 publications

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“…In an absorbing medium this directional anisotropy results in different strengths of absorption for beams traveling along opposite directions which is called directional dichroism. Similar directional optical phenomena -schematically shown in Fig.1 have already been observed for emission 6,7 , absorption 8 and diffraction 9 of light in materials belonging to two different symmetry classes where the directional optical phenomena are manifested in the corresponding two configurations.…”

supporting

confidence: 77%

Symmetry conditions for nonreciprocal light propagation in magnetic crystals

2013

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Recent studies demonstrated the violation of reciprocity in optical processes in low-symmetry magnetic crystals. In these crystals the speed of light can be different for counter-propagating beams. Correspondingly, they can show strong directional anisotropies such as direction dependent absorption also called directional dichroism[S. Bordács et al., Nat. Phys. 8, 734 (2012); M. Saito et al., J. Phys. Soc. Jpn. 77, 013705 (2008)]. Based on symmetry considerations, we identify the magnetic point groups of materials which can host such directional anisotropies and also provide a list of possible candidate materials to observe these phenomena. In most of these cases, the symmetry of the crystal allows directional anisotropy not only for optical processes but also for the propagation of beams of particles and scalar waves. We also predict new types of directional optical anisotropies -besides the optical magnetoelectric effect and the magnetochiral dichroism investigated so far -and specify the magnetic point groups of crystals where they can emerge.

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confidence: 77%

Symmetry conditions for nonreciprocal light propagation in magnetic crystals

2013

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“…15 MΧD has since only been observed for a Ni(II) complex, 16 two-dimensional chiral Cr(III)-Mn(II) ferrimagnets, 21,22 for a diamagnetic molecular Zn(II) aggregate, 23 for some diamagnetic organic compounds, [24][25][26] in the photolysis of Cr(III) oxalates 41,42 and in Bragg scattering. 43 There are even fewer reports on observation of XMΧD. XMΧD was rst observed in the Cr 2 O 3 antiferromagnet 17 and subsequently in the GaFeO 3 ferrimagnet 18 and more recently in Mn(II) and Co(II) molecule-based helices.…”

Section: Resultsmentioning

confidence: 99%

Hard X-ray magnetochiral dichroism in a paramagnetic molecular 4f complex

et al. 2020

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“…Such a link has been explored ever since the discovery of the natural optical activity by Arago and magnetically induced optical activity by Faraday in the early 19 th century 5 . Besides the observation in synthetic molecular compounds under a magnetic field [6][7][8][9] , researchers have observed the MCh effect in organic liquids 10 , diamagnetic crystals 11 , magnetic thin films [12][13][14] , liquid crystals 15 , and chiral metamaterials 16 . The MCh effect also gives rise to an unambiguous enantiomeric excess in a photochemical reaction and a separation of racemic 3 mixtures which were not possible solely by natural or magnetically induced optical activity 17,18 .…”

Section: Introductionmentioning

confidence: 97%

Observation of strong excitonic magneto-chiral anisotropy in twisted bilayer van der Waals crystals

Lan

Liu

Wang

et al. 2020

Preprint

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Abstract The interplay between chirality and magnetism generates a distinct physical process, the magneto-chiral effect, which enables one to develop functionalities that cannot be achieved solely by any of the two. Such a process is universal with the breaking of parity-inversion and time-reversal symmetry simultaneously. However, the magneto-chiral effect observed so far is weak when the matter responds to photons, electrons, or phonons. Here we report the first observation of strong magneto-chiral response to excitons in a twisted bilayer tungsten disulfide with the amplitude of excitonic magneto-chiral (ExMCh) anisotropy reaches a value of ~4%. We further found the ExMCh anisotropy features with a spectral splitting of ~7 nm, precisely the full-width at half maximum of the excitonic chirality spectrum. Without an externally applied strong magnetic field, the observed ExMCh effect with a spontaneous magnetic moment from the ferromagnetic substrate of thulium iron garnet at room temperature is favorable for device applications. The unique ExMCh processes provide a new pathway to actively control magneto-chiral applications in photochemical reactions, asymmetric synthesis, and drug delivery.

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Magnetochiral Anisotropy in Bragg Scattering

Cited by 33 publications

References 13 publications

Symmetry conditions for nonreciprocal light propagation in magnetic crystals

Symmetry conditions for nonreciprocal light propagation in magnetic crystals

Hard X-ray magnetochiral dichroism in a paramagnetic molecular 4f complex

Observation of strong excitonic magneto-chiral anisotropy in twisted bilayer van der Waals crystals

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