Topological magnonics in the two-dimensional van der Waals magnet 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi>CrI</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:math>

Aguilera, Eduardo; Jaeschke-Ubiergo, R.; Vidal-Silva, N.; Torres, Luis E. F. Foa; Núñez, Álvaro S.

doi:10.1103/physrevb.102.024409

Cited by 51 publications

(23 citation statements)

References 45 publications

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“…By the same token, the interlayer coupling J c = 0.8 K alone (J c /J = 0.3) would yield the underestimated value of T N = 5.5 K. Using both D/J = 0.85 and J c /J = 0.3, we arrive at T N = 7.1 K in an excellent agreement with the experiment, thus completing the microscopic description of MoP 3 SiO 11 . Moreover, from the spin-wave expression for the magnon gap = 2DS = 3D [67], we estimate = 6.6 K in a remarkable agreement with the experimental value of about 7 K (Sec. III B).…”

Section: Model Simulationssupporting

confidence: 87%

MoP3SiO11 : A 4d3 honeycomb antiferromagnet with disconnected octahedra

et al. 2021

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We report the crystal structure and magnetic behavior of the 4d 3 spin-3/2 silicophosphate MoP 3 SiO 11 studied by high-resolution synchrotron x-ray diffraction, neutron diffraction, thermodynamic measurements, and ab initio band-structure calculations. Our data revise the crystallographic symmetry of this compound and establish its rhombohedral space group (R 3c) along with the geometrically perfect honeycomb lattice of the Mo 3+ ions residing in disconnected MoO 6 octahedra. Long-range antiferromagnetic order with the propagation vector k = 0 observed below T N = 6.8 K is a combined effect of the nearest-neighbor in-plane exchange coupling J 2.6 K, easy-plane single-ion anisotropy D 2.2 K, and a weak interlayer coupling J c 0.8 K. The 12% reduction in the ordered magnetic moment of the Mo 3+ ions and the magnon gap of 7 K induced by the single-ion anisotropy further illustrate the impact of spin-orbit coupling on the magnetism. Our analysis puts forward single-ion anisotropy as an important ingredient of 4d 3 honeycomb antiferromagnets despite their nominally quenched orbital moment.

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Section: Model Simulationssupporting

confidence: 87%

MoP3SiO11 : A 4d3 honeycomb antiferromagnet with disconnected octahedra

et al. 2021

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“…The topology of the electronic band structure is closely linked to the Berry curvature in the k-space (6,7), for which the spin-orbit coupling (SOC) plays a key role. In principle, it is also possible to realize nontrivial topology in a bosonic system, such as a system of magnonic excitations (8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18), since the band topology can be treated independently from the statistical nature of the particles. Such topological excitations and the corresponding nontrivial in-gap edge states are chiral and robust against disorder; it is thus believed that the emergence and manipulation of the topological magnonic states bare a tremendous promise for future applications in magnonics and topological spintronics, such as, e.g., quantized pumping of magnons (19), spin-wave beam splitter (10), magnon waveguides (20), chiral traveling-wave magnon amplifiers (21), and magnon-driven orbitronics (22).…”

Section: Introductionmentioning

confidence: 99%

Topological magnon insulators in two-dimensional van der Waals ferromagnets CrSiTe ₃ and CrGeTe ₃ : Toward intrinsic gap-tunability

et al. 2021

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The bosonic analogs of topological insulators have been proposed in numerous theoretical works, but their experimental realization is still very rare, especially for spin systems. Recently, two-dimensional (2D) honeycomb van der Waals ferromagnets have emerged as a new platform for topological spin excitations. Here, via a comprehensive inelastic neutron scattering study and theoretical analysis of the spin-wave excitations, we report the realization of topological magnon insulators in CrXTe 3 (X = Si, Ge) compounds. The nontrivial nature and intrinsic tunability of the gap opening at the magnon band-crossing Dirac points are confirmed, while the emergence of the corresponding in-gap topological edge states is demonstrated theoretically. The realization of topological magnon insulators with intrinsic gap-unability in this class of remarkable 2D materials will undoubtedly lead to new and fascinating technological applications in the domain of magnonics and topological spintronics.

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“…On the other hand, as recently shown in Ref. [25], the Kitaev interaction, an anisotropic term of the intralayer exchange interaction between the nearest-neighboring Cr atoms, can produce a similar insulating phase in single layer CrI 3 . To examine its role in our bilayer structure, we take into account this additional intralayer interaction [26,27],…”

Section: Phase Transition From Semimetal and Insulatormentioning

confidence: 51%

Spin-orbit coupling and linear crossings of dipolar magnons in van der Waals antiferromagnets

2020

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A magnon spin-orbit coupling, induced by the dipole-dipole interaction, is derived in monoclinic-stacked bilayer honeycomb spin lattice with perpendicular magnetic anisotropy and antiferromagnetic interlayer coupling. Linear crossings are predicted in the magnon spectrum around the band minimum in valley, as well as in the high-frequency range around the zone boundary. The linear crossings in K and K valleys, which connect the acoustic and optical bands, can be gapped when the intralayer dipole-dipole or Kitaev interactions exceed the interlayer dipole-dipole interaction, resulting in a phase transition from semimetal to insulator. Our results are useful for analyzing the magnon spin dynamics and transport properties in van der Waals antiferromagnets.

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Topological magnonics in the two-dimensional van der Waals magnet CrI3

Cited by 51 publications

References 45 publications

MoP3SiO11 : A 4d3 honeycomb antiferromagnet with disconnected octahedra

MoP3SiO11 : A 4d3 honeycomb antiferromagnet with disconnected octahedra

Topological magnon insulators in two-dimensional van der Waals ferromagnets CrSiTe ₃ and CrGeTe ₃ : Toward intrinsic gap-tunability

Spin-orbit coupling and linear crossings of dipolar magnons in van der Waals antiferromagnets

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Topological magnonics in the two-dimensional van der Waals magnet CrI3

Cited by 51 publications

References 45 publications

MoP3SiO11 : A 4d3 honeycomb antiferromagnet with disconnected octahedra

MoP3SiO11 : A 4d3 honeycomb antiferromagnet with disconnected octahedra

Topological magnon insulators in two-dimensional van der Waals ferromagnets CrSiTe 3 and CrGeTe 3 : Toward intrinsic gap-tunability

Spin-orbit coupling and linear crossings of dipolar magnons in van der Waals antiferromagnets

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Topological magnon insulators in two-dimensional van der Waals ferromagnets CrSiTe ₃ and CrGeTe ₃ : Toward intrinsic gap-tunability