Systematic Analysis Method for Nonlinear Response Tensors

Oiwa, Rikuto; Kusunose, Hiroaki

doi:10.7566/jpsj.91.014701

Cited by 38 publications

(22 citation statements)

References 89 publications

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“…where C ll l is the model-independent coefficient. 98) The contribution to the Drude-type nonlinear conductivity is obtained as the real part after taking the trace. Then, the lowest-order contribution to σ x;xx is obtained as h 3 tt 2 z for l = l = l = 1, which well corresponds to the model-parameter dependence of the asymmetric band deformation, as discussed above.…”

Section: Nonreciprocal Transportmentioning

confidence: 99%

Nonreciprocal Transport in Noncoplanar Magnetic Systems without Spin-Orbit Coupling, Net Scalar Chirality, or Magnetization

Hayami¹,

Yatsushiro²

2022

Preprint

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We propose a new mechanism of nonlinear nonreciprocal transport in magnetic systems. By considering a noncoplanar magnetic ordering on a bilayer triangular lattice, we clarify that a local scalar chirality degree of freedom is a source of nonreciprocal transport, which does not require any relativistic spin-orbit coupling, net scalar chirality, and net magnetization. We show a close relationship between the asymmetric band modulation and the nonreciprocal transport under the noncoplanar magnetic ordering based on the model-parameter dependences in the real-space picture.

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Section: Nonreciprocal Transportmentioning

confidence: 99%

Nonreciprocal Transport in Noncoplanar Magnetic Systems without Spin-Orbit Coupling, Net Scalar Chirality, or Magnetization

Hayami¹,

Yatsushiro²

2022

Preprint

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“…1(a)] breaks the global inversion symmetry, parity-violating phenomena like multiferroic and nonlinear responses are expected from the symmetry viewpoint in both AFM and AFQ orderings. [67][68][69][74][75][76][77] Thus, it is highly desired to identify the microscopic order parameters in the II and III phases. From this aspect, the authors have recently proposed a way to detect the staggered antiferroic order parameters by the NQR/NMR measurement.…”

Section: Introductionmentioning

confidence: 99%

Mean-field Study of Antiferromagnetic and Antiferroquadrupolar Orderings in Tetragonal CeCoSi

Yatsushiro,

Hayami

2022

Preprint

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We investigate the stability of the multipolar orderings in f -electron material CeCoSi based on a self-consistent meanfield calculation for the effective localized model. This material has two ordered phases in the temperature-pressure phase diagram: the antiferromagnetic phase and the nonmagnetic phase, the latter of which has been suggested to be an antiferroquadrupolar phase. Meanwhile, the origin of the antiferroquadrupolar phase has been unclear, since a quadrupole degree of freedom is present only between the ground-state level and highly separated excited-state level under a tetragonal crystalline electric field (CEF), whose energy scale is much larger than the transition temperature. To understand the sequence of the phase transition from the paramagnetic phase, antiferroquadrupolar phase, and antiferromagnetic phase when decreasing the temperature, we examine the important interaction parameters in the effective localized model. We clarify that the 3z 2 − r 2 -type of the antiferroquadrupolar interactions can renormalize the CEF level splitting, which assists a quadrupolar ordering even in a tetragonal system without orbital degeneracy. Moreover, the stability of the antiferroquadrupolar and antiferromagnetic states in a magnetic field and the behavior of the magnetic/quadrupolar susceptibility are also presented for the information to identify the unknown order parameter in the nonmagnetic ordered phase.

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“…The TB Hamiltonian is constructed by using the symmetryadopted multipole basis Z α [4][5][6] as H = α z α Z α , where Z α are the independent multipole basis, which satisfy the nor-malization Tr(Z α Z α ) = 1, and belonging to the identity irreducible representation of D 4 3 . Each Z α is expressed by the direct product of the cluster or bond basis [27,28] and atomic basis as shown later [29,30], which are generated automatically by the symbolic computation with symmetry operations [31]. Then, the coefficients…”

mentioning

confidence: 99%

“…The inter-band contribution from the itinerant hopping process, d VV z;z [v], is always dominant irrespective of µ, and the EIR occurs even in the insulator. Analyzing the essential parameters to exhibit the finite response d z;z [30], it turns out that the lowest-order of the response is proportional to the highest-weight term…”

mentioning

confidence: 99%

Rotation and electric-field responses and absolute enantioselection in chiral crystals

Oiwa,

Kusunose

2022

Preprint

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Microscopic origin of chirality and possible electric-field induced rotation and rotation-field induced electric polarization are investigated. By building up a realistic tight-binding model for elemental Te crystal in terms of symmetry-adopted basis, we identify the microscopic origin of the chirality and essential couplings among polar and axial vectors with the same time-reversal properties. Based on this microscopic model, we elucidate quantitatively that the inter-band process, driven by the nearest-neighbor spin-dependent imaginary hopping, is the key factor in the electric-field induced rotation and its inverse response. From the symmetry point of view, these couplings are characteristic common to any chiral material, leading to a possible experimental approach to achieve absolute enantioselection by simultaneously applied electric and rotation fields, or magnetic field and electric current, and so on, as a conjugate field of the chirality.

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Systematic Analysis Method for Nonlinear Response Tensors

Cited by 38 publications

References 89 publications

Nonreciprocal Transport in Noncoplanar Magnetic Systems without Spin-Orbit Coupling, Net Scalar Chirality, or Magnetization

Nonreciprocal Transport in Noncoplanar Magnetic Systems without Spin-Orbit Coupling, Net Scalar Chirality, or Magnetization

Mean-field Study of Antiferromagnetic and Antiferroquadrupolar Orderings in Tetragonal CeCoSi

Rotation and electric-field responses and absolute enantioselection in chiral crystals

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