Planar thermal Hall effect of topological bosons in the Kitaev magnet α-RuCl3

Czajka, Peter; Gao, Tong; Hirschberger, Max; Lampen-Kelley, Paula; Banerjee, Arnab; Quirk, Nicholas; Mandrus, David; Nagler, S. E.; Ong, N. P.

doi:10.1038/s41563-022-01397-w

Cited by 70 publications

(37 citation statements)

References 35 publications

(38 reference statements)

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“…[27] (dashed region) or the parameters used in Ref. [11] (cross), κ 2D xy /T does not exceed 0.15 f.u., far below the experimentally reported values [4,5,7].…”

Section: The Resulting (Magnon Only) Thermal Hall Conductivity |κ 2dcontrasting

confidence: 57%

“…While the monotonically increasing temperature dependence observed in Ref. [7] is qualitatively reproduced, the field dependence is opposite -the experiment shows an increasing |κ xy (h)|, while our data invariably decrease monotonically. Its physical reason is clear -in the fully polarized phase, the increase of the magnetic field leads to the (linear in field) growth of the magnon gap min .…”

Section: The Resulting (Magnon Only) Thermal Hall Conductivity |κ 2dsupporting

confidence: 56%

“…When magnon, phonon and extrinsic contributions are taken into account, we are able to quantitatively reproduce the recent experimental data [7] on thermal conductivity in this material.…”

mentioning

confidence: 62%

“…According to the recent experimental data in Ref. [7], the thermal Hall conductivity tends to be largest in the high field range h ≈ 10 T and at moderately high temperatures 8 T 12 K. Therefore, for concreteness, we investigate the magnitude of κ 2D xy /T under the relevant experimental conditions h = 10 T and T = 10 K. We first start with the fully polarized (PL) phase. Because of the difficulty of representing the plots in the four-dimensional parameter space (Γ, Γ , J 1 , J 3 ), we choose to plot the distribution of the κ 2D xy /T values vs. J 1 in Fig.…”

Section: The Resulting (Magnon Only) Thermal Hall Conductivity |κ 2dmentioning

confidence: 99%

“…While the nature of the resulting phase is still under intense debate, the observation of approximately quantized value of the thermal Hall conductivity κ xy /T in a narrow range of field (6 < h < 9 T) [4,5] was attributed to the presence of the Majorana edge mode, predicted to exist in Kitaev's spin liquid subjected to an external magnetic field [2,6]. This interpretation has been recently challenged by an independent measurement of the thermal Hall effect [7], in which the authors find a non-quantized, temperature-dependent κ xy , which they attribute to a bosonic, rather than fermionic mechanism [8][9][10][11][12]. Its nature remains controversial, with one recent experimental study suggesting the possibility of quantized Hall effect in high fields h > 10 T [13], while another attributing the origin of the thermal Hall effect to phonons [14].…”

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confidence: 99%

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Magnons, Phonons, and Thermal Hall Effect in Candidate Kitaev Magnet $α$-RuCl$_3$

Li¹,

Han²,

Nevidomskyy³

2023

Preprint

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We study the nature of the debated thermal Hall effect in the candidate Kitaev material α-RuCl3. Without assuming the existence of a gapped spin liquid, we show that a realistic minimal spin model in the canted zigzag phase suffices, at the level of linear spin-wave theory, to qualitatively explain the observed temperature and magnetic field dependence of the non-quantized thermal Hall conductivity κxy, with its origin lying in the Berry curvature of the magnon bands. The magnitude of the effect is however too small compared to the measurement by Czajka et al. [Nat. Mater. 22, 36-41 (2023)], even after scanning a broad range of model parameters so as to maximize κxy/T . Recent experiments suggest that phonons play an important role, which we show couple to the spins, endowing phonons with chirality. The resulting intrinsic contribution, from both magnons and phonons, is however still insufficient to explain the observed magnitude of the Hall signal. After careful analysis of the extrinsic phonon mechanisms, we use the recent experimental data on thermal transport in α-RuCl3 by Lefrançois et al. [Phys. Rev. X 12, 021025 (2022)] to determine the phenomenological ratio of the extrinsic and intrinsic contributions η ≡ κ E xy /κ I xy . We find η = 1.2 ± 0.5, which when combined with our computed intrinsic value, explains quantitavely both the magnitude and detailed temperature dependence of the experimental thermal Hall effect in α-RuCl3.

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“…[27] (dashed region) or the parameters used in Ref. [11] (cross), κ 2D xy /T does not exceed 0.15 f.u., far below the experimentally reported values [4,5,7].…”

Section: The Resulting (Magnon Only) Thermal Hall Conductivity |κ 2dcontrasting

confidence: 57%

Section: The Resulting (Magnon Only) Thermal Hall Conductivity |κ 2dsupporting

confidence: 56%

“…When magnon, phonon and extrinsic contributions are taken into account, we are able to quantitatively reproduce the recent experimental data [7] on thermal conductivity in this material.…”

mentioning

confidence: 62%

Section: The Resulting (Magnon Only) Thermal Hall Conductivity |κ 2dmentioning

confidence: 99%

mentioning

confidence: 99%

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Magnons, Phonons, and Thermal Hall Effect in Candidate Kitaev Magnet $α$-RuCl$_3$

Li¹,

Han²,

Nevidomskyy³

2023

Preprint

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Electrical Tracking of the Mott Insulating Kitaev Magnet using Graphene/α‐RuCl₃ Heterostructure

Chau,

Choi,

Hwang

et al. 2024

Adv Funct Materials

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Electrical signatures for quantum magnetic phases of α‐RuCl3 sensed by an adjacent graphene field‐effect transistor (FET) are reported. The gate‐voltage dependence of the graphene FET reveals p‐type doping beneath α‐RuCl3 caused by the charge transfer due to the work function difference. Furthermore, the gate‐voltage hysteresis exhibits a marked change in the transport behavior with the temperature variation. The high‐T simple paramagnetic phase and the low‐T zigzag antiferromagnetic phase of α‐RuCl3 exhibit negligible hysteresis. In sharp contrast, a huge hysteresis of the graphene FET at intermediate temperatures is observed. The possibility that the observed conductance hysteresis is associated with the intriguing continuum excitations of the thermally induced Kitaev paramagnet state is discussed. The results show that the proximity effect‐based electric approach can be utilized for investigating charge‐neutral quasiparticles in quantum magnetic insulators.

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State transition in chemical condensation

Feng,

Zheng,

Huang

2024

Introduction to Condensed Matter Chemistry

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Planar thermal Hall effect of topological bosons in the Kitaev magnet α-RuCl3

Cited by 70 publications

References 35 publications

Magnons, Phonons, and Thermal Hall Effect in Candidate Kitaev Magnet $α$-RuCl$_3$

Magnons, Phonons, and Thermal Hall Effect in Candidate Kitaev Magnet $α$-RuCl$_3$

Electrical Tracking of the Mott Insulating Kitaev Magnet using Graphene/α‐RuCl₃ Heterostructure

State transition in chemical condensation

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Planar thermal Hall effect of topological bosons in the Kitaev magnet α-RuCl3

Cited by 70 publications

References 35 publications

Magnons, Phonons, and Thermal Hall Effect in Candidate Kitaev Magnet $α$-RuCl$_3$

Magnons, Phonons, and Thermal Hall Effect in Candidate Kitaev Magnet $α$-RuCl$_3$

Electrical Tracking of the Mott Insulating Kitaev Magnet using Graphene/α‐RuCl3 Heterostructure

State transition in chemical condensation

Contact Info

Product

Resources

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Electrical Tracking of the Mott Insulating Kitaev Magnet using Graphene/α‐RuCl₃ Heterostructure