Magnetic Chern bands and triplon Hall effect in an extended Shastry-Sutherland model

Malki, M.; Schmidt, K. P.

doi:10.1103/physrevb.95.195137

Cited by 34 publications

(34 citation statements)

References 52 publications

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“…We find that excitations become topologically nontrivial in magnetic fields. This implies features like protected edge states crossing triplon-band gaps, similar to the topological magnon edge states discussed as spin conductors with reduced dissipation [22,23], and the thermal Hall effect [24][25][26][27][28].…”

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confidence: 62%

Nontrivial Triplon Topology and Triplon Liquid in Kitaev-Heisenberg-type Excitonic Magnets

et al. 2019

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The combination of strong spin-orbit coupling and correlations, e.g. in ruthenates and iridates, has been proposed as a means to realize quantum materials with nontrivial topological properties. We discuss here Mott insulators where onsite spin-orbit coupling favors a local Jtot = 0 singlet ground state. We investigate excitations into a low-lying triplet, triplons, and find them to acquire nontrivial band topology in a magnetic field. We also comment on magnetic states resulting from triplon condensation, where we find, in addition to the same ordered phases known from the Jtot = 1 2 Kitaev-Heisenberg model, a triplon liquid taking the parameter space of Kitaev's spin liquid. arXiv:1812.00833v2 [cond-mat.str-el]

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confidence: 62%

Nontrivial Triplon Topology and Triplon Liquid in Kitaev-Heisenberg-type Excitonic Magnets

et al. 2019

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“…9,10 One important class of such materials is Mott insulators at half-filling, which can be described using local moment (spin) models. When SOC is present it often gives rise to Dzyaloshinskii-Moriya interactions (DMI), 11,12 which provides one route towards topologically nontrivial magnetic excitations in both ordered, [13][14][15][16][17] and disordered 13,18,19 systems. Materials with these properties could potentially be exploited in antiferromagnetic spintronics, 20 and topological magnonic devices.…”

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confidence: 99%

Magnon thermal Hall effect in kagome antiferromagnets with Dzyaloshinskii-Moriya interactions

Laurell

Fiete

2018

Phys. Rev. B

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We theoretically study magnetic and topological properties of antiferromagnetic kagome spin systems in the presence of both in-and out-of-plane Dzyaloshinskii-Moriya interactions. In materials such as the iron jarosites, the in-plane interactions stabilize a canted noncollinear "umbrella" magnetic configuration with finite scalar spin chirality. We derive expressions for the canting angle, and use the resulting order as a starting point for a spinwave analysis. We find topological magnon bands, characterized by non-zero Chern numbers. We calculate the magnon thermal Hall conductivity, and propose the iron jarosites as a promising candidate system for observing the magnon thermal Hall effect in a noncollinear spin configuration. We also show that the thermal conductivity can be tuned by varying an applied magnetic field, or the in-plane Dzyaloshinskii-Moriya strength. In contrast with previous studies of topological magnon bands, the effect is found to be large even in the limit of small canting. PACS numbers: 75.25.-j,75.30.Ds,75.47.-m arXiv:1804.09783v2 [cond-mat.str-el]

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“…Another approach maps spin operators to hard-core bosons and then to spinless fermions coupled to a Chern-Simons gauge field 19 . Recent work shows that, with small interaction anisotropy, the triplons themselves form topological bands with Chern numbers ±2 at low field (zeroth plateau) 20,21 . If true that topological, perhaps non-Abelian, excitations can exist in an FPP "vacuum", then the stability of the FPP itself should be established in order to distinguish between such excitations and fluctuations of phase.…”

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confidence: 99%

Degeneracy of the 1/8 Plateau and Antiferromagnetic Phases in the Shastry-Sutherland Magnet TmB4

et al. 2018

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The 1/8 fractional plateau phase (1/8-FPP) in Shastry-Sutherland Lattice (SSL) spin systems has been viewed an exemplar of emergence on an Archimedean lattice. Here we explore this phase in the Ising magnet TmB 4 using high-resolution specific heat (C) and magnetization (M) in the field-temperature plane. We show that the 1/8-FPP is smoothly connected to the antiferromagnetic (AF) phase on ramping the field from H = 0. Thus, the 1/8-FPP is not a distinct ground state of TmB 4 . The implication of these results for Heisenberg spins on the SSL is discussed.

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Magnetic Chern bands and triplon Hall effect in an extended Shastry-Sutherland model

Cited by 34 publications

References 52 publications

Nontrivial Triplon Topology and Triplon Liquid in Kitaev-Heisenberg-type Excitonic Magnets

Nontrivial Triplon Topology and Triplon Liquid in Kitaev-Heisenberg-type Excitonic Magnets

Magnon thermal Hall effect in kagome antiferromagnets with Dzyaloshinskii-Moriya interactions

Degeneracy of the 1/8 Plateau and Antiferromagnetic Phases in the Shastry-Sutherland Magnet TmB4

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