Planar Hall Effect in Antiferromagnetic MnTe Thin Films

Yin, Gen; Yu, Jie-Xiang; Liu, Yizhou; Lake, Roger K.; Zang, Jiadong; Wang, Kang L.

doi:10.1103/physrevlett.122.106602

Cited by 43 publications

(39 citation statements)

References 44 publications

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“…However, it has been gradually realized that both these two planar magneto transport effects, namely, the positive LMC and PHE, are not sufficient transport signatures to guarantee the presence of CA in WSMs. Recently, it has been reported that similar planar transport behaviors can also arise through various extrinsic mechanisms [11,[15][16][17][18][19] and even appear in * ygyao@bit.edu.cn materials without any Weyl nodes [20][21][22][23][24][25][26][27][28][29][30][31][32]. In addition, Weyl nodes themselves do not always exhibit positive LMC.…”

Section: Introductionmentioning

confidence: 99%

Quantum oscillations of the nonlinear planar effects signifying chiral anomaly in Weyl Semimetals

Zeng¹,

Nandy²,

Liu³

et al. 2022

Preprint

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In view of searching the signature of the celebrated chiral anomaly (CA) in Weyl semimetals (WSMs) in ongoing experiments, quantum oscillation in linear response regime has been considered as an important signature in the magneto transports in WSMs, due to its unique relation to CA. Investigating the nonlinear planar effects (NPEs) starting from the semiclassical regime to the ultra-quantum limit within the framework of Boltzmann transport theory incorporating Landau quantization, we here propose the quantum oscillations in NPEs can serve as a robust signature of CA in WSMs. By obtaining analytical expressions, we show that the quantum oscillations of the nonlinear effects exhibit two different period scales in 1/B (B is the magnetic field) compared to the linear responses where only one period scale exists. We find that these quantum oscillations in NPEs are attributed to the deviation of chiral chemical potential (CCP), which is proportional to the finite band tilt as well as transverse electric field and therefore, directly linked to CA in WSMs. In addition, we also show that the CA-induced nonlinear magneto conductivity is linear and independent in the magnetic field in the semiclassical and ultraquantum regimes, respectively. We conclude that the proposed behaviors of NPEs in different regimes uniquely signify the existence of CA and therefore, can serve as a probe of identifying CA in WSMs in experiment.

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Section: Introductionmentioning

confidence: 99%

Quantum oscillations of the nonlinear planar effects signifying chiral anomaly in Weyl Semimetals

Zeng¹,

Nandy²,

Liu³

et al. 2022

Preprint

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“…The benefits of using AFMs have been recently actively studied [20][21][22][23][24][25][26][27][28]. Usually, AFMs are considered in limiting cases, namely, compensated, when the AFM has no static magnetization at the interface [29], and noncompensated, when the boundary of the AFM is magnetized [30].…”

mentioning

confidence: 99%

Spin Wave Propagation through Antiferromagnet/Ferromagnet Interface

Busel¹,

Gorobets²,

Tretiakov³

2021

Preprint

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We study the problem of controlling spin waves propagation through an antiferromagnet/ferromagnet interface via tuning material parameters. It is done by introducing the degree of sublattice noncompensation of antiferromagnet (DSNA), which is a physical characteristic of finite-thickness interfaces. The DSNA value can be varied by designing interfaces with a particular disorder or curvilinear geometry. We describe a spin-wave propagation through any designed antiferromagnet/ferromagnet interface considering a variable DSNA and appropriate boundary conditions. As a result, we calculate the physical transmittance and reflectance of the spin waves as a function of frequency and show how to control them via the exchange parameters tuning.

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“…As a prototype of ferroelectric Rashba semiconductors, − GeTe crystallizes in a trigonal ferroelectric phase (space group R 3 m ) below 720 K. − Bulk MnTe, a semiconducting A-type antiferromagnet with the Néel temperature T N ∼ 310 K, − crystallizes in the hexagonal NiAs structure, and thus is likely to be able to be integrated with GeTe to form multiferroics. Indeed, Ge 1– x Mn x Te compound has been widely investigated both experimentally and theoretically. − It was found that the doping of GeTe with Mn atoms maintains the rhombohedral lattice distortion and ferroelectricity in Ge 1– x Mn x Te ( x < 0.3), in which Mn spins ferromagnetically couple to each other via free-carrier-mediated RKKY (Ruderman–Kittel–Kasuya–Yosida) exchange interactions with the Curie temperature up to ∼200 K. , However, as evident, the deleterious effects associated with the doping scheme (e.g., enhanced impurity scattering and reduced Curie temperature) remain in Ge 1– x Mn x Te.…”

mentioning

confidence: 99%

Ferroelectric Switching of Pure Spin Polarization in Two-Dimensional Electron Gas

Gong

Tang

et al. 2020

Nano Lett.

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Two-dimensional electron gas (2DEG) created at compound interfaces can exhibit a broad range of exotic physical phenomena, including quantum Hall phase, emergent ferromagnetism, and superconductivity. Although electron spin plays key roles in these phenomena, the fundamental understanding and application prospects of such emergent interfacial states have been largely impeded by the lack of purely spin-polarized 2DEG. In this work, by first-principles calculations of the multiferroic superlattice GeTe/MnTe, we find the ferroelectric polarization of GeTe is concurrent with the half-metallic 2DEG at interfaces. Remarkably, the pure spin polarization of the 2DEG can be created and annihilated by polarizing and depolarizing the ferroelectrics and can be switched (between pure spin-up and pure spin-down) by flipping the ferroelectric polarization. Given the electric-field amplification effect of ferroelectric electronics, we envision multiferroic superlattices could open up new opportunities for low-power, high-efficiency spintronic devices such as spin field-effect transistors.

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Planar Hall Effect in Antiferromagnetic MnTe Thin Films

Cited by 43 publications

References 44 publications

Quantum oscillations of the nonlinear planar effects signifying chiral anomaly in Weyl Semimetals

Quantum oscillations of the nonlinear planar effects signifying chiral anomaly in Weyl Semimetals

Spin Wave Propagation through Antiferromagnet/Ferromagnet Interface

Ferroelectric Switching of Pure Spin Polarization in Two-Dimensional Electron Gas

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