Layer-locked spin states revealed in the centrosymmetric nodal-line semimetal HfSiS

Qian, Hongliang; Zhang, X.; Liu, C. M.; Jiang, Qi; Liu, W. J.; Zha, Heming; Wang, D. Y.; Shen, Xiaoping; Ye, M.; Guo, Yanfeng; Qiao, Shuang

doi:10.1103/physrevb.104.035145

Cited by 8 publications

(7 citation statements)

References 32 publications

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“…Owing to the coexistence of P and time-reversal symmetry T, the HSP in nonmagnetic materials localized at a sector P k (r) is odd distributed in both real and momentum spaces, i.e., P k (r) = −P k (−r), and P k (r) = −P −k (r). Therefore, while HSP has been successfully measured by techniques with both rand kresolution, such as spin-and angle-resolved photoemission spectroscopy (spin-ARPES) [18][19][20][21][22][23][24][25][26], its application in spintronics is still hindered by the compensation of polarization originated from the high global symmetry.…”

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confidence: 99%

Role of hidden spin polarization in non-reciprocal transport of antiferromagnets

Chen¹,

Gu²,

Li³

et al. 2022

Preprint

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The discovery of hidden spin polarization (HSP) in centrosymmetric nonmagnetic crystals, i.e., spatially distributed spin polarization originated from local symmetry breaking, has promised an expanded material pool for future spintronics. However, the measurements of such exotic effects have been limited to subtle space-and momentum-resolved techniques, unfortunately hindering their applications. Here, we theoretically predict macroscopic non-reciprocal transports induced by HSP when coupling another spatially distributed quantity, such as staggered local moments in a PT -symmetric antiferromagnet. By using a four-band model Hamiltonian, we demonstrate that HSP plays a crucial role in determining the asymmetric bands with respect to opposite momenta. Such band asymmetry leads to non-reciprocal nonlinear conductivity, exemplified by tetragonal CuMnAs via our first-principles calculations. We further provide the material design principles for large nonlinear conductivity, including two-dimensional nature, multiple band crossings near the Fermi level, and symmetry protected HSP. Our work not only reveals direct spintronic applications of HSP (such as Néel order detection), but also sheds light on finding observables of other hidden effects, such as hidden optical polarization and hidden Berry curvature.

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confidence: 99%

Role of hidden spin polarization in non-reciprocal transport of antiferromagnets

Chen¹,

Gu²,

Li³

et al. 2022

Preprint

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“…In the present work, we investigate the vortical configurations in a mesoscopic superconducting square with a small centered square hole when mixed pairing orders are presented. Based on a tight-binding model Hamiltonian, the on-site repulsive interaction among the electrons is introduced to generate the mixed singlettriplet pairing [36,37]. By tuning the chemical potential, the stable spin-triplet p-wave superconducting order can coexist with spin-singlet d-wave and s-wave superconducting ones [38,39].…”

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confidence: 99%

“…For sin p x ± i sin p y -wave superconductivity, we can define the pairing potential as Δ ± (i) ≡ Δ px (i) ± iΔ py (i). The total energy E t of the system is given by [36,37,41]…”

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confidence: 99%

“…One can find that the zeroenergy peaks mainly emerge in the diagonal directions as a result of the strong reflections of the quasiparticles. In particular, the emergency of the mixed singlet-triplet pairing configurations may be accompanied by the appearance of the finite spin polarization [36,42]. Obviously, the net magnetization occurs with parallel and antiparallel orientations on each diagonal of the sample at zero applied magnetic flux in fig.…”

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confidence: 99%

“…7 Fig. 7: Spatial profiles of (7,9,8), (9,11,10), (11,13,12), and (13,15,14) states when Φ/Φ0 = 20, 25, 30, and 34, respectively. Displayed quantities are the amplitude of Δ+ (column (I)) and Δ− (column (II)), the total order-parameter amplitude |Δ| (column (III)), the relative phase φxy (column (IV)), and the amplitude of Δ d (column (V)).…”

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confidence: 99%

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Vortical configurations in mesoscopic superconducting square loop with mixed pairing orders

Zha¹

2020

EPL

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Based on the microscopic Bogoliubov-de Gennes theory, we study vortical configurations in a mesoscopic superconducting square loop with mixed pairing orders. By choosing appropriate interaction strengths and chemical potential, the spin-triplet p-wave and subdominant spin-singlet d-wave pairing symmetries can be stabilized. In a small external magnetic field, unusual elliptical-like vortices in chiral p-wave orders as well as elongated vortices in the d-wave order tend to form in sample diagonals. For an enlarged flux, we find a two-quanta skyrmionic mode for the p-wave components, while the closed domain wall does not appear compared to the previous studies in superconducting systems with a pure p-wave state. Particularly, a novel multi-skyrmionic pattern containing four single-quanta skyrmions takes place with increasing flux. Such a single-quanta vortex structure consisting of two spatially separated half-quantum vortices is analogous to the nematic skyrmion with unit topological charge. In addition, several complex hybrid or multiple skyrmionic configurations are revealed in the strong flux range.

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Progress of hidden spin polarization in inversion-symmetric crystals

Guan

Xiong

Zhi

et al. 2022

Sci. China Phys. Mech. Astron.

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Layer-locked spin states revealed in the centrosymmetric nodal-line semimetal HfSiS

Cited by 8 publications

References 32 publications

Role of hidden spin polarization in non-reciprocal transport of antiferromagnets

Role of hidden spin polarization in non-reciprocal transport of antiferromagnets

Vortical configurations in mesoscopic superconducting square loop with mixed pairing orders

Progress of hidden spin polarization in inversion-symmetric crystals

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