Orbital gravitomagnetoelectric response and orbital magnetic quadrupole moment correction

Koki, Shinada,; Peters, Robert W.

doi:10.1103/physrevb.107.214109

“…For instance, the thermodynamic magnetic quadrupole moments are defined to be conjugate to the gradient of magnetic fields, and they are directly related to the magnetoelectric property (Gao et al 2018, Shitade et al 2018, Bhowal and Spaldin 2022. It is noteworthy that the thermodynamic multipole moments contribute to other cross-correlated responses such as the nonlinear thermoelectric response (Gao and Xiao 2018), temperature-gradient-induced magnetization (gravito-magnetoelectric effect) (Shitade et al 2019, Shinada andPeters 2023), and spin accumulations (Shitade and Tatara 2022). In the same spirit, the electric quadrupole moments are defined and estimated in the language of thermodynamics and quantum geometry (Daido et al 2020, Kitamura et al 2021.…”

Section: Multipolar Degree Of Freedom Of Visible Antiferromagnetsmentioning

confidence: 99%

Magnetic parity violation and parity-time-reversal-symmetric magnets

Watanabe,

Yanase

2024

J. Phys.: Condens. Matter

0

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Parity-time-reversal symmetry ( PT symmetry), a symmetry for the combined operations of space inversion ( P ) and time reversal ( T ), is a fundamental concept of physics and characterizes the functionality of materials as well as P and T symmetries. In particular, the PT -symmetric systems can be found in the centrosymmetric crystals undergoing the parity-violating magnetic order which we call the odd-parity magnetic multipole order. While this spontaneous order leaves PT symmetry intact, the simultaneous violation of P and T symmetries gives rise to various emergent responses that are qualitatively different from those allowed by the nonmagnetic P -symmetry breaking or by the ferromagnetic order. In this review, we introduce candidates hosting the intriguing spontaneous order and overview the characteristic physical responses. Various off-diagonal and/or nonreciprocal responses are identified, which are closely related to the unusual electronic structures such as hidden spin-momentum locking and asymmetric band dispersion.

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“…For instance, the thermodynamic magnetic quadrupole moments are defined to be conjugate to the gradient of magnetic fields, and they are directly related to the magnetoelectric property (Bhowal and Spaldin, 2022;Shitade et al, 2018). It is noteworthy that the thermodynamic multipole moments contribute to other cross-correlated responses such as the nonlinear thermoelectric response , temperature-gradient-induced magnetization (gravito-magnetoelectric effect) (Shinada and Peters, 2023;Shitade et al, 2019), and spin accumulations (Shitade and Tatara, 2022). In the same spirit, the electric quadrupole moments are defined and estimated in the language of thermodynamics and quantum geometry (Daido et al, 2020;Kitamura et al, 2021).…”

Section: Multipolar Degree Of Freedom Of Visible Antiferromagnetsmentioning

confidence: 99%

Photocurrent response in parity-time symmetric current-ordered states

Watanabe

¹

,

Yanase

²

2021

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Parity-time-reversal symmetry (PT symmetry), a symmetry for the combined operations of space inversion (P) and time reversal (T ), is a fundamental concept of physics and characterizes the functionality of materials as well as P and T symmetries. In particular, the PT -symmetric systems can be found in the centrosymmetric crystals undergoing the parity-violating magnetic order which we call the odd-parity magnetic multipole order. While this spontaneous order leaves PT symmetry intact, the simultaneous violation of P and T symmetries gives rise to various emergent responses that are qualitatively different from those allowed by the nonmagnetic P-symmetry breaking or by the ferromagnetic order. In this review, we introduce candidates hosting the intriguing spontaneous order and overview the characteristic physical responses. Various off-diagonal and/or nonreciprocal responses are identified, which are closely related to the unusual electronic structures such as hidden spin-momentum locking and asymmetric band dispersion. Contents I. Introduction II. Magnetic Parity Violation and Space-Time Symmetry A. Parity-time-reversal symmetry and parity violations B. Hidden Magnetic Degrees of Freedom in Crystals C. Multipolar degree of freedom of visible antiferromagnets III. Emergent Responses of PT -symmetric magnets A. Electric-Magnetic Classification of Response Function B. Magnetic Counterpart of Piezoelectric Effect C. Nonreciprocal Property of Electronic Transport and Optical Response 1. Nonreciprocal conductivity 2. Photocurrent generation IV. Availability of PT -symmetric Magnets and Physical Properties A. Switching the compensated magnets B. Control of electronic property with PT -symmetric magnetic order V.

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