Magnetoelectric<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>MnPS</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>as a candidate for ferrotoroidicity

Ressouche, E.; Loire, Mickael; Simonet, Virginie; Ballou, R.; Stunault, A.; Wildes, A.

doi:10.1103/physrevb.82.100408

Cited by 156 publications

(107 citation statements)

References 26 publications

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“…There are good candidate materials, e.g., trichalcogenides M X X 3 (M : transition metal, X: chalcogen, X = P, Si, Ge) [44,45]. We have predicted several new phenomena related with the staggered electronic ordering, such as the spinorbital orders.…”

Section: Summary and Concluding Remarksmentioning

confidence: 99%

Emergent spin-valley-orbital physics by spontaneous parity breaking

Hayami

Kusunose

Motome

2016

J. Phys.: Condens. Matter

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Abstract. The spin-orbit coupling in the absence of spatial inversion symmetry plays an important role in realizing intriguing electronic states in solids, such as topological insulators and unconventional superconductivity. Usually, the inversion symmetry breaking is inherent in the lattice structures, and hence, it is not easy to control these interesting properties by external parameters. We here theoretically investigate the possibility of generating the spin-orbital entanglement by spontaneous electronic ordering caused by electron correlations. In particular, we focus on the centrosymmetric lattices with local asymmetry at the lattice sites, e.g., zig-zag, honeycomb, and diamond structures. In such systems, conventional staggered orders, such as charge order and antiferromagnetic order, break the inversion symmetry and activate the antisymmetric spin-orbit coupling, which is hidden in a sublatticedependent form in the paramagnetic state. Considering a minimal two-orbital model on a honeycomb lattice, we scrutinize the explicit form of the antisymmetric spinorbit coupling for all the possible staggered charge, spin, orbital, and spin-orbital orders. We show that the complete table is useful for understanding of spin-valleyorbital physics, such as spin and valley splitting in the electronic band structure and generalized magnetoelectric responses in not only spin but also orbital and spin-orbital channels, reflecting in peculiar magnetic, elastic, and optical properties in solids.

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Section: Summary and Concluding Remarksmentioning

confidence: 99%

Emergent spin-valley-orbital physics by spontaneous parity breaking

Hayami

Kusunose

Motome

2016

J. Phys.: Condens. Matter

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“…However, unambiguous observations of long-range toroidal order have proven challenging due to the weak, short-range interactions between toroidal dipoles and the requirement of simultaneously breaking both space and time reversal symmetry to demonstrate its existence 18 . Early experiments focused on the magnetoelectric effect 43,44 , which is not unique to the toroidal moments 28 , only provided an indication for ferrotoroidic order. Subsequent experiments reported direct observations of ferrotoroidicity, where ferrotoroidic domains were observed in an olivine crystal (LiCoPO 4 ) and domain orientations were identified by second harmonic generation 26 .…”

Section: Static Toroidal Multipolesmentioning

confidence: 99%

Electromagnetic toroidal excitations in matter and free space

et al. 2016

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The toroidal dipole is a localized electromagnetic excitation, distinct from the magnetic and electric dipoles. While the electric dipole can be understood as a pair of opposite charges and the magnetic dipole as a current loop, the toroidal dipole corresponds to currents flowing on the surface of a torus. Toroidal dipoles provide physically significant contributions to the basic characteristics of matter including absorption, dispersion, and optical activity. Toroidal excitations also exist in free-space as spatially and temporally localized electromagnetic pulses propagating at the speed of light and interacting with matter. We review recent experimental observations of resonant toroidal dipole excitations in metamaterials and the discovery of anapoles, non-radiating current configurations involving toroidal dipoles. While certain fundamental and practical aspects of toroidal electrodynamics remain open for the moment, we envision that exploitation of toroidal response can have important implications for the fields of photonics, sensing, energy and information. IntroductionThe interactions of electromagnetic radiation with matter underpin some of the most important technologies today -from telecommunications to information processing and data storage; from spectroscopy and imaging to light-assisted manufacturing. Our understanding and description of the electromagnetic properties of matter traditionally involves the concept of electric and magnetic dipoles, as well as their more complex combinations, known as multipoles. Introduced by Maxwell and Lorentz and later refined by Jackson and Landau, this framework, termed the multipole expansion, is central in physics and is being routinely applied in the study of optical, condensed matter, atomic, nuclear phenomena and beyond 1 . Within this framework, electromagnetic media can be represented by a set of point-like multipole sources [2][3][4][5] . The commonly used set of multipoles comprises the electric and magnetic families, which can be represented by oscillating charges and loop currents respectively. Dynamic toroidal multipoles constitute a third independent family of elementary electromagnetic sources, rather than an alternative multipole expansion or higher-order corrections to the conventional electric and magnetic multipoles (see tutorial inset I).Introduced in 1958 by Y. B. Zeldovich, toroidal moments have been considered in systems of toroidal topology (see Fig. 1) and studied in the context of nuclear 6 , atomic 7 , and molecular physics 8 , classical electrodynamics 9,10 , and solid state physics 3 . In the field of electromagnetism, in particular, a number of works have led to the development of a complete theoretical framework for toroidal electrodynamics [11][12][13][14][15] and the prediction of exotic effects, including dynamic non-radiating charge current configurations 10 and non-reciprocal interactions 9 . Following recent experimental observations of toroidal contributions in the response of materials across the electromagnetic spectrum, dyn...

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“…To further illustrate the power of SNP, the case of MnPS 3 is highly interesting [34]. This compound belongs to the thiophosphate family mainly studied for their intercalation properties.…”

Section: Spherical Neutron Polarimetry (Snp)mentioning

confidence: 99%

Polarized neutron diffraction

Ressouche

2014

Journées de la Neutronique

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Abstract. This lecture addresses the different applications of polarized neutron diffraction, with or without subsequent polarization analysis, to the determination of magnetic structures, to the separation of magnetic and nuclear contributions and to magnetization distributions mapping. The first sections introduce some of the fundamental equations. Then the problems of magnetic domains, encountered in crystals and of particular importance as soon as polarized neutrons are concerned, are presented. The final sections discuss some of the different ways to use polarized neutron and are illustrated by examples. PREAMBLENeutron scattering has progressed over the last sixty years to become an invaluable tool to probe experimentally condensed matter. As far as magnetism is concerned, this technique has been recognized from the early days as unique. The most widespread use of this tool is of course the determination of magnetic structures using unpolarized beams, that is the determination of the directions in which moments point in a magnetically ordered material. Since the first experiment on MnO by Shull and Smart in 1949 [1] which was an experimental proof of the antiferromagnetism predicted by Néel, thousands of structure determinations have been reported and have revealed much more complicated magnetic arrangements than the simple ferromagnetic or antiferromagnetic cases. The comprehension of the stability of these new structures was and is still at the origin of numerous theoretical developments, leaving the study of magnetic structures completely open.From a theoretical point of view, the neutron spin and the possibility of using polarized neutron beam was taken into account from the very beginning [2-6]. Complete equations of polarization analysis in a neutron scattering experiment were derived as early as 1963 [7,8]. But in comparison to those theoretical advances, experimental possibilities were much longer to appear. In 1959 Nathans et al. demonstrated the huge sensitivity of polarized neutrons to weak magnetic signals, allowing very precise magnetization distribution maps to be drawn [9]. Then it took ten years to Moon, Riste and Koehler to operate in Oak Ridge the first triple axis machine with both incident polarized neutrons and longitudinal polarization analysis capabilities, giving access to many new pieces of information [10]. Another twenty years were necessary until Tasset et al. generalized longitudinal polarization analysis to a completely spherical one [11]. During this time, Maleyev also showed that polarization of neutron beams could allow very precise measurements of the energy exchange in a scattering experiment, leading to the development of the spin echo technique by Mezei [12] and to the numerous applications this technique has today. This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MagnetoelectricMnPS3as a candidate for ferrotoroidicity

Cited by 156 publications

References 26 publications

Emergent spin-valley-orbital physics by spontaneous parity breaking

Emergent spin-valley-orbital physics by spontaneous parity breaking

Electromagnetic toroidal excitations in matter and free space

Polarized neutron diffraction

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