Anomalous Thermal Hall Effect in an Insulating van der Waals Magnet

Zhang, Heda; Xu, Chunqiang; Carnahan, Caitlin; Sretenovic, Milos; Suri, Nishchay; Ke, Xuezhi

doi:10.1103/physrevlett.127.247202

Cited by 49 publications

(19 citation statements)

References 48 publications

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“…This is in contrast to the case of VI 3 , an insulator for which magnons were recently shown to generate a thermal Hall effect ( 29 ), because of the large intrinsic DM interaction and associated magnon Berry curvature in that material. The difference between VI 3 and Cu 3 TeO 6 shows up clearly in the H dependence of

is independent of H in the former and present at

, whereas it is roughly linear in H in the latter ( Fig.…”

Section: Discussioncontrasting

confidence: 63%

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Large phonon thermal Hall conductivity in the antiferromagnetic insulator Cu₃TeO₆

Chen

Boulanger

Wang

et al. 2022

Proc. Natl. Acad. Sci. U.S.A.

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Phonons are known to generate a thermal Hall effect in certain insulators, including oxides with rare-earth impurities, quantum paraelectrics, multiferroic materials, and cuprate Mott insulators. In each case, a special feature of the material is presumed relevant for the underlying mechanism that confers chirality to phonons in a magnetic field. A fundamental question is whether a phonon Hall effect is an unusual occurrence—linked to special characteristics such as skew scattering off rare-earth impurities, structural domains, ferroelectricity, or ferromagnetism—or a much more common property of insulators than hitherto believed. To help answer this question, we have turned to a material with none of the previously encountered special features: the cubic antiferromagnet Cu 3 TeO 6 . We find that its thermal Hall conductivity κ xy is among the largest of any insulator so far. We show that this record-high κ xy signal is due to phonons, and it does not require the presence of magnetic order, as it persists above the ordering temperature. We conclude that the phonon Hall effect is likely to be a fairly common property of solids.

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is independent of H in the former and present at

, whereas it is roughly linear in H in the latter ( Fig.…”

Section: Discussioncontrasting

confidence: 63%

“…We also rule out that

in Cu 3 TeO 6 is generated by topological magnons, as is the case in the material VI 3 ( 29 ). The topological magnons present in Cu 3 TeO 6 are at high energy, namely, 17.75 meV (∼200 K) ( 27 , 30 ).…”

Section: Discussionmentioning

confidence: 71%

Large phonon thermal Hall conductivity in the antiferromagnetic insulator Cu₃TeO₆

Chen

Boulanger

Wang

et al. 2022

Proc. Natl. Acad. Sci. U.S.A.

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“…In the case of ML (BL) CrTeY, the largest κ xy reaches up to 0.14 (0.11) WK −1 m −1 , 0.13 (0.10) WK −1 m −1 , and 0.14 (0.17) WK −1 m −1 at -0.37 (-0.34) eV, -0.09 (0.11) eV, and 0.08 (0.13) eV, respectively. The κ xy of 2D CrXY are much larger than that of other vdW ferromagnets, e.g., VI 3 (0.01 WK −1 m −1 ) [86].…”

Section: Anomalous Hall Anomalous Nernst and Anomalous Thermal Hall E...mentioning

confidence: 80%

“…( 10). From the above equation, one can find that a steep slope of σ xy ver- The ATHE, the thermal analogue of AHE, has been widely used to study the charge neutral quasiparticles in quantum materials [80][81][82][83][84][85][86]. The calculated ATHC (κ xy ) of ML and BL CrXY are plotted in Fig.…”

Section: Anomalous Hall Anomalous Nernst and Anomalous Thermal Hall E...mentioning

confidence: 99%

The first- and second-order magneto-optical effects and intrinsically anomalous transport in 2D van der Waals layered magnets CrXY (X = S, Se, Te; Y = Cl, Br, I)

Yang,

Zhou

et al. 2022

Preprint

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Recently, the two-dimensional magnetic semiconductor CrSBr has attracted considerable attention due to its excellent air-stable property and high magnetic critical temperature. Here, we systematically investigate the electronic structure, magnetocrystalline anisotropy energy, first-order magnetooptical effects (Kerr and Faraday effects) and second-order magneto-optical effects (Schäfer-Hubert and Voigt effects) as well as intrinsically anomalous transport properties (anomalous Hall, anomalous Nernst, and anomalous thermal Hall effects) of two-dimensional van der Waals layered magnets CrXY (X = S, Se, Te; Y = Cl, Br, I) by using the first-principles calculations. Our results show that monolayer and bilayer CrXY (X = S, Se) are narrow band gap semiconductors, whereas monolayer and bilayer CrTeY are multi-band metals. The magnetic ground states of bilayer CrXY and the easy magnetization axis of monolayer and bilayer CrXY are confirmed by the magnetocrystalline anisotropy energy calculations. Utilizing magnetic group theory analysis, the first-order magnetooptical effects as well as anomalous Hall, anomalous Nernst, and anomalous thermal Hall effects are identified to exist in ferromagnetic state with out-of-plane magnetization. The second-order magneto-optical effects are not restricted by the above symmetry requirements, and therefore can arise in ferromagnetic and antiferromagnetic states with in-plane magnetization. The calculated results are compared with the available theoretical and experimental data of other two-dimensional magnets and some conventional ferromagnets. The present work reveals that monolayer and bilayer CrXY with superior magneto-optical responses and anomalous transport properties provide an excellent material platform for the promising applications of magneto-optical devices, spintronics, and spin caloritronics.

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“…A sizeable value of D/J is needed in our model to stabilize the quantum skyrmions. DMI originates from spin-orbit-coupling (SOC), which is a relativistic effect, and therefore D is usually much smaller than J in real materials [2,30,33]. However, recently methods of tuning the value of J using external lasers [7,8], even to the point of an exchange free magnet [9], have been put forth.…”

Section: Model and Ground Statesmentioning

confidence: 99%

Quantum fluctuations in the order parameter of quantum skyrmion crystals

Mæland,

Sudbø

2022

Preprint

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Traditionally, skyrmions are treated as continuum magnetic textures of classical spins with a well-defined topological skyrmion number. Owing to their topological protection, skyrmions have attracted great interest as building blocks in future memory technology. Smaller skyrmions offer greater memory density, however, quantum effects are not negligible for skyrmions with sizes of just a few lattice constants. In this paper we study quantum fluctuations around dense skyrmion crystal ground states, and focus on the utility of a discretized, chiral order parameter for quantum skyrmions. The order parameter is found to be a useful indicator of the existence of quantum skyrmions, and captures the quantum phase transition between two distinct skyrmion ground states.

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Anomalous Thermal Hall Effect in an Insulating van der Waals Magnet

Cited by 49 publications

References 48 publications

Large phonon thermal Hall conductivity in the antiferromagnetic insulator Cu₃TeO₆

Large phonon thermal Hall conductivity in the antiferromagnetic insulator Cu₃TeO₆

The first- and second-order magneto-optical effects and intrinsically anomalous transport in 2D van der Waals layered magnets CrXY (X = S, Se, Te; Y = Cl, Br, I)

Quantum fluctuations in the order parameter of quantum skyrmion crystals

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Anomalous Thermal Hall Effect in an Insulating van der Waals Magnet

Cited by 49 publications

References 48 publications

Large phonon thermal Hall conductivity in the antiferromagnetic insulator Cu3TeO6

Large phonon thermal Hall conductivity in the antiferromagnetic insulator Cu3TeO6

The first- and second-order magneto-optical effects and intrinsically anomalous transport in 2D van der Waals layered magnets CrXY (X = S, Se, Te; Y = Cl, Br, I)

Quantum fluctuations in the order parameter of quantum skyrmion crystals

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Large phonon thermal Hall conductivity in the antiferromagnetic insulator Cu₃TeO₆

Large phonon thermal Hall conductivity in the antiferromagnetic insulator Cu₃TeO₆