Terahertz spin ratchet effect in magnetic metamaterials

Hild, Markus; Golub, L. E.; Fuhrmann, A.; Otteneder, M.; Kronseder, M.; Matsubara, Masakazu; Kobayashi, T.; Oshima, Daisuke; Honda, Anna; Kato, Takeshi; Wunderlich, J.; Back, Christian; Ganichev, Sergey

doi:10.1103/physrevb.107.155419

“…The material realization may be feasible in playgrounds other than the bulk materials. The magnetic parity violation has been realized by metamaterials where the magnetic islands are arrayed (Lehmann et al, 2019) and the ferromagnetic thin films are patterned (Hild et al, 2023;Matsubara et al, 2022). The high tunability of physical responses is advantageous, and it has been demonstrated, for example, for the photocurrent generation in the magnetic metamaterials (Matsubara et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

“…( 55)] which is non-negligible, particularly in the case the low-frequency light irradiation such as terahertz light. The significant contributions have been observed by detailed studies of frequency dependence of the photocurrent generation (Hild et al, 2023;Olbrich et al, 2014) where extrinsic scattering effects play a key role, while the resonant contributions are dominant in the frequency range of visible light (Matsubara et al, 2022;Plank et al, 2018). The extrinsic mechanism for the photocurrent generation has been formulated in the framework of the semiclassical theory.…”

Section: Photocurrent Generationmentioning

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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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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