Theory of electric, magnetic, and toroidal polarizations in crystalline solids with applications to hexagonal lonsdaleite and cubic diamond

Winkler, Roland; Zülicke, U.

doi:10.1103/physrevb.107.155201

“…As a result, the emergent responses arise from the coupling between the hidden spincharge coupling and 'antiferroic' order. It is convenient for clarifying the macroscopic physical properties to introduce the multipolar degrees of freedom (Watanabe and Yanase 2017, 2018a, Hayami et al 2018, Winkler and Zülicke 2023.…”

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

1

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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“…As a result, the emergent responses arise from the coupling between the hidden spin-charge coupling and 'antiferroic' order. It is convenient for clarifying the macroscopic physical properties to introduce the multipolar degrees of freedom (Hayami et al, 2018;Watanabe andYanase, 2017, 2018a;Winkler and Zülicke, 2023).…”

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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