scholarly journals Band manipulation and spin texture in interacting moiré helical edges

2021 ◽  
Vol 104 (20) ◽  
Author(s):  
Yang-Zhi Chou ◽  
Jennifer Cano ◽  
J. H. Pixley
Keyword(s):  
Spin Texture

scholarly journals Complex magnetism of the two-dimensional antiferromagnetic Ge2F: from a Néel spin-texture to a potential antiferromagnetic skyrmion

RSC Advances ◽  
2021 ◽  
Vol 11 (15) ◽  
pp. 8654-8663
Author(s):  
Fatima Zahra Ramadan ◽  
Flaviano José dos Santos ◽  
Lalla Btissam Drissi ◽  
Samir Lounis
Keyword(s):  
Density Functional Theory ◽  
Magnetic Properties ◽  
Density Functional ◽  
Low Energy ◽  
Two Dimensional ◽  
Functional Theory ◽  
2D Material ◽  
Energy Models ◽  
Spin Texture

Based on density functional theory combined with low-energy models, we explore the magnetic properties of a hybrid atomic-thick two-dimensional (2D) material made of germanene doped with fluorine atoms in a half-fluorinated configuration (Ge2F).

scholarly journals Chirality-induced spin texture switching in twisted bilayer graphene

2021 ◽  
Vol 104 (7) ◽  
Author(s):  
Kunihiro Yananose ◽  
Giovanni Cantele ◽  
Procolo Lucignano ◽  
Sang-Wook Cheong ◽  
Jaejun Yu ◽  
...  
Keyword(s):  
Bilayer Graphene ◽  
Twisted Bilayer Graphene ◽  
Spin Texture

scholarly journals Defect‐Engineered Dzyaloshinskii–Moriya Interaction and Electric‐Field‐Switchable Topological Spin Texture in SrRuO 3 (Adv. Mater. 33/2021)

2021 ◽  
Vol 33 (33) ◽  
pp. 2170255
Author(s):  
Jingdi Lu ◽  
Liang Si ◽  
Qinghua Zhang ◽  
Chengfeng Tian ◽  
Xin Liu ◽  
...  
Keyword(s):  
Electric Field ◽  
Spin Texture ◽  
Moriya Interaction

scholarly journals Spin-texture-driven electrical transport in multi-Q antiferromagnets

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Soonbeom Seo ◽  
Satoru Hayami ◽  
Ying Su ◽  
Sean M. Thomas ◽  
Filip Ronning ◽  
...  
Keyword(s):  
Electrical Transport ◽  
Kondo Lattice ◽  
Magnetic Interactions ◽  
Temperature Phase ◽  
Fermi Surfaces ◽  
Magnetic Texture ◽  
Crystalline Anisotropy ◽  
Field Temperature ◽  
Kondo Lattice Model ◽  
Spin Texture

AbstractUnusual magnetic textures can be stabilized in f-electron materials due to the interplay between competing magnetic interactions, complex Fermi surfaces, and crystalline anisotropy. Here we investigate CeAuSb2, an f-electron incommensurate antiferromagnet hosting both single-Q and double-Q spin textures as a function of magnetic fields (H) applied along the c axis. Experimentally, we map out the field-temperature phase diagram via electrical resistivity and thermal expansion measurements. Supported by calculations of a Kondo lattice model, we attribute the puzzling magnetoresistance enhancement in the double-Q phase to the localization of the electronic wave functions caused by the incommensurate magnetic texture.

scholarly journals Multiple-q noncollinear magnetism in an itinerant hexagonal magnet

2018 ◽  
Vol 4 (11) ◽  
pp. eaau3402 ◽  
Author(s):  
R. Takagi ◽  
J. S. White ◽  
S. Hayami ◽  
R. Arita ◽  
D. Honecker ◽  
...  
Keyword(s):  
Magnetic Order ◽  
Interaction Mechanism ◽  
Spin Interaction ◽  
The Novel ◽  
Spin Order ◽  
Emergent Phenomena ◽  
Unique Material ◽  
Lattice State ◽  
Spin Texture ◽  
Different Origins

Multiple-q spin order, i.e., a spin texture characterized by a multiple number of coexisting magnetic modulation vectors q, has recently attracted attention as a source of nontrivial magnetic topology and associated emergent phenomena. One typical example is the triple-q skyrmion lattice state stabilized by Dzyaloshinskii-Moriya interactions in noncentrosymmetric magnets, while the emergence of various multiple-q states of different origins is expected according to the latest theories. Here, we investigated the magnetic structure of the itinerant polar hexagonal magnet Y3Co8Sn4, in which several distinctive mechanisms favoring multiple-q states are allowed to become active. Small-angle neutron-scattering experiments suggest the formation of incommensurate triple-q magnetic order with an in-plane vortex-like spin texture, which can be most consistently explained in terms of the novel four-spin interaction mechanism inherent to itinerant magnets. The present results suggest a new route to realizing exotic multiple-q orders and that itinerant hexagonal magnets, including the R3M8Sn4 family with wide chemical tunability, can be a unique material platform to explore their rich phase diagrams.

scholarly journals Realization of acoustic spin transport in metasurface waveguides

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Yang Long ◽  
Danmei Zhang ◽  
Chenwen Yang ◽  
Jianmin Ge ◽  
Hong Chen ◽  
...  
Keyword(s):  
Acoustic Waves ◽  
Electromagnetic Waves ◽  
Degrees Of Freedom ◽  
Transport Processes ◽  
Angular Momenta ◽  
Transverse Electromagnetic ◽  
Spin Texture ◽  
Momentum Coupling ◽  
Practical Implications ◽  
Spin Momentum

Abstract Spin angular momentum enables fundamental insights for topological matters, and practical implications for information devices. Exploiting the spin of carriers and waves is critical to achieving more controllable degrees of freedom and robust transport processes. Yet, due to the curl-free nature of longitudinal waves distinct from transverse electromagnetic waves, spin angular momenta of acoustic waves in solids and fluids have never been unveiled only until recently. Here, we demonstrate a metasurface waveguide for sound carrying non-zero acoustic spin with tight spin-momentum coupling, which can assist the suppression of backscattering when scatters fail to flip the acoustic spin. This is achieved by imposing a soft boundary of the π reflection phase, realized by comb-like metasurfaces. With the special-boundary-defined spin texture, the acoustic spin transports are experimentally manifested, such as the suppression of acoustic corner-scattering, the spin-selected acoustic router with spin-Hall-like effect, and the phase modulator with rotated acoustic spin.

scholarly journals Quantum Structured Light: Non-classical Spin Texture of Twisted Single-photon Pulses

2021 ◽  
Author(s):  
Li-Ping Yang ◽  
Zubin Jacob
Keyword(s):  
Spin Density ◽  
Electromagnetic Waves ◽  
Single Photon ◽  
Structured Light ◽  
Three Dimensional ◽  
Quantum Spin ◽  
Single Photons ◽  
Spin Order ◽  
Spin Noise ◽  
Spin Texture

Abstract Classical structured light with controlled polarization and orbital angular momentum (OAM) of electromagnetic waves has varied applications in optical trapping, bio-sensing, optical communications and quantum simulations. The classical electromagnetic theory of such structured light beams and pulses have advanced significantly over the last two decades. However, a framework for the quantum density of spin and OAM for single-photons remains elusive. Here, we develop a theoretical framework and put forth the concept of quantum structured light for space-time wavepackets at the single-photon level. Our work marks a paradigm shift beyond scalar-field theory as well as the paraxial approximation and can be utilized to study the quantum properties of the spin and OAM of all classes of twisted quantum light pulses. We capture the uncertainty in full three-dimensional (3D) projections of vector spin demonstrating their quantum behavior beyond the conventional concept of classical polarization. Even in laser beams with high OAM along the propagation direction, we predict the existence of large OAM quantum fluctuations in the transverse plane which can be verified experimentally. We show that the spin density generates modulated helical texture beyond the paraxial limit and exhibits distinct statistics for Fock-state vs. coherent-state twisted pulses. We introduce the quantum correlator of photon spin density to characterize the nonlocal spin noise providing a rigorous parallel with fermionic spin noise operators. Our work paves the way for quantum spin-OAM physics in twisted single photon pulses and also opens explorations for new phases of light with long-range spin order.

scholarly journals Magnetic skyrmion spin texture hosts and detection using small-angle neutron scattering

2019 ◽  
Vol 75 (a1) ◽  
pp. a212-a212
Author(s):  
Rebecca L. Dally ◽  
William D. Ratcliff ◽  
Markus Bleuel ◽  
Lunyong Zhang ◽  
Sang-Wook Cheong ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Spin Texture
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