Symmetry analysis of tensors in the honeycomb lattice of edge-sharing octahedra

Utermohlen, Franz G.; Trivedi, Nandini

doi:10.1103/physrevb.103.155124

Cited by 8 publications

(2 citation statements)

References 76 publications

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“…If the magnetic field is applied along the b direction, the Hamiltonian is unchanged under the C 2 rotation around b axis. Therefore, κ ab should be zero in the presence of the magnetic field parallel to b or its equivalent directions when a magnetic order does not occur [43,56,73].…”

Section: Symmetry Argumentmentioning

confidence: 99%

Field-angle dependence of thermal Hall conductivity in a magnetically ordered Kitaev-Heisenberg system

Koyama

Nasu²

2021

Phys. Rev. B

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We study magnetic excitations and thermal Hall effect on the Kitaev-Heisenberg model under magnetic fields. By employing the spin-wave theory for the magnetic orders realized in this model, we examine the topological nature of the spin-wave dispersions and calculate the thermal Hall conductivity. The comprehensive investigations on the field-angle dependence clarify that the thermal Hall conductivity is sensitive to the spin ordered pattern and excitation spectra of magnons; this quantity is enhanced by the noncoplanar spin configurations and small magnon gap in the excitation spectrum. On the other hand, we also find a common feature in the field-angle dependence of the thermal Hall conductivity. It vanishes when the magnetic field is on the planes spanned by the spin axes. We reveal that the behavior is intrinsic to the Kitaev-Heisenberg model in an applied field and demonstrate that the introduction of the off-diagonal spin interaction causes the disappearance of the feature in the thermal Hall conductivity.

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Section: Symmetry Argumentmentioning

confidence: 99%

Field-angle dependence of thermal Hall conductivity in a magnetically ordered Kitaev-Heisenberg system

Koyama

Nasu²

2021

Phys. Rev. B

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“…Since the macroscopic properties of a crystal depend only on its point group symmetries and not on those related to translations, we can constrain the response tensors associated with the AHC and SHC using a combination of the generating symmetries of the point group 42…”

Section: Contribution Of the Orbital-antisymmetric Zeeman Termmentioning

confidence: 99%

Tunable spin-charge conversion in class-I topological Dirac semimetals

Li,

Shen,

Zhang

2021

Preprint

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We theoretically demonstrate that type-I topological Dirac semimetals (TDSMs) can provide a platform for realizing both electrically and magnetically tunable spin-charge conversion. With time-reversal symmetry, the spin component along the uniaxial rotation axis (z-axis) is approximately conserved, which leads to an anisotropic spin Hall effect-the resulting spin Hall current relies on the relative orientation between the external electric field and the z-axis. The application of a magnetic field, on the other hand, breaks timereversal symmetry, driving the TDSM into a Weyl semimetal phase and, consequently, partially converting the spin current to a charge Hall current. Using the Kubo formulas, we numerically evaluate the spin and charge Hall conductivities based on a low-energy TDSM Hamiltonian together with the Zeeman coupling. Besides the conventional tensor element of the spin Hall conductivity σ z xy , we find that unconventional components, such as σ x xy and σ y xy , also exist and vary as the magnetic field is rotated. Likewise, the charge Hall conductivity also exhibits appreciable tunability upon variation of the magnetic field.We show that such tunability originates from the interplay of symmetry and band topology of the TDSMs.

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