Li<i>et al.</i>Reply

Li, Yufan; Kanazawa, Naoya; Yu, Xiang; Kagawa, Fumitaka; Tokura, Y.

doi:10.1103/physrevlett.112.059702

Cited by 40 publications

(66 citation statements)

References 4 publications

(6 reference statements)

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“…Owing to the unprecedented level of control and precision, ultracold atomic gases provide an ideal test ground to emulate various quantum phenomena in condensed matter physics [2,3]. Recent experimental realization of artificial spin-orbit coupling (SOC) [4][5][6][7][8] which couples the internal states and the orbit motion of the atoms not only offers a platform to simulate the response of charged particles to external electromagnetic field, but also give opportunities to search of novel quantum states [9][10][11][12][13][14][15][16][17][18]. Relevant investigations show that the SOC can lead to many new quantum phases such as plane-wave phase [19], stripe phase [20][21][22], bright soliton [23,24], dark soliton [25], half-quantum vortex configuration [22,26,27], and topological superfluid phase [6], which enrich the phase diagram and physics of BEC system.…”

Section: Introductionmentioning

confidence: 99%

Topological excitations in rotating Bose-Einstein condensates with Rashba-Dresselhaus spin-orbit coupling in a two-dimensional optical lattice

Yang

Wang

et al. 2019

Eur. Phys. J. Plus

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We study the ground-state configurations and spin textures of rotating two-component Bose-Einstein condensates (BECs) with Rashba-Dresselhaus spin-orbit coupling (RD-SOC), which are confined in a two-dimensional (2D) optical lattice plus a 2D harmonic trap. In the absence of rotation, a relatively small isotropic 2D RD-SOC leads to the generation of ghost vortices for initially miscible BECs, while it gives rise to the creation of rectangular vortex-antivortex lattices for initially immiscible BECs. As the strength of the 2D RD-SOC enhances, the visible vortices or the 2D vortexantivortex chains are created for the former case, whereas the rectangular vortex-antivortex lattices are transformed into vortex-antivortex rings for the later case. For the initially immiscible BECs with fixed 2D RD-SOC strength, the increase of rotation frequency can result in the structural phase transition from square vortex lattice to irregular triangular vortex lattice and the system transition from initial phase separation to phase mixing. In addition, we analyze the combined effects of 1D RD-SOC and rotation on the vortex configurations of the ground states for the case of initial phase separation. The increase of 1D SOC strength, rotation frequency or both of them may result in the formation of vortex chain and phase mixing. Furthermore, the typical spin textures for both the cases of 2D RD-SOC and 1D RD-SOC are discussed. It is shown that the system favors novel spin textures and skyrmion configurations including an exotic skyrmion-half-skyrmion lattice (skyrmion-meron lattice), a complicated meron lattice, a skyrmion chain, and a Bloch domain wall.

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Section: Introductionmentioning

confidence: 99%

Topological excitations in rotating Bose-Einstein condensates with Rashba-Dresselhaus spin-orbit coupling in a two-dimensional optical lattice

Yang

Wang

et al. 2019

Eur. Phys. J. Plus

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“…In materials with several complex magnetic phases, such as chiral magnetic materials with a volume Dzyaloshinskii-Moriya interaction, it may be possible to use MAS to quickly establish a magnetic phase diagram because the spin texture in each magnetic phase has a unique resonance response. This specificity gives MAS an advantage as compared to electrical measurements such as the topological Hall effect, [17][18][19][20][21][22] which is more difficult to interpret because the signals are not unique to skyrmion phases or helical phases. [19][20][21][22][23][24] In this letter, we present a study of spin-wave dynamics in a single crystal of B20 FeGe using MAS.…”

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confidence: 99%

Topological spin dynamics in cubic FeGe near room temperature

Turgut

Stolt

Jin

et al. 2017

Journal of Applied Physics

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Understanding spin-wave dynamics in chiral magnets is a key step for the development of highspeed, spin-wave based spintronic devices that take advantage of chiral and topological spin textures for their operation. Here we present an experimental and theoretical study of spin-wave dynamics in a cubic B20 FeGe single crystal. Using the combination of waveguide microwave absorption spectroscopy (MAS), micromagnetic simulations, and analytical theory, we identify the resonance dynamics in all magnetic phases (field polarized, conical, helical, and skyrmion phases). Because the resonance frequencies of specific chiral spin textures are unique, quantitative agreement between our theoretical predictions and experimental findings for all resonance frequencies and spin wave modes enables us to unambiguously identify chiral magnetic phases and to demonstrate that MAS is a powerful tool to efficiently extract a magnetic phase diagram. These results provide a new tool to accelerate the integration of chiral magnetic materials into spintronic devices.Identifying and understanding of spin-wave excitations in chiral and topological magnetic materials is a fundamental step towards their integration into spintronic devices. Moreover, some of these materials host magnetic skyrmions, in which spins form a topologically non-trivial excitation with an integer winding number. 1,2 Magnetic skyrmions can be driven to move by spin torques with an ultralow current threshold because there is weak or no pinning, 3,4 which makes them appealing for low-power memory, 5 magnetic logic, 6 and auto-oscillator 7 devices. In support of these potential applications, magnetic skyrmions have been investigated using several methods including Lorentz transmission electron microscopy (LTEM), [8][9][10] inelastic neutron scattering, 11,12 magnetic susceptibility, 13,14 and recently by microwave absorption spectroscopy. 15,16 Microwave absorption spectroscopy (MAS), in particular, is a powerful tool for identifying and studying dynamical magnetic excitations in materials. In materials with several complex magnetic phases, such as chiral magnetic materials with a volume Dzyaloshinskii-Moriya interaction, it may be possible to use MAS to quickly establish a magnetic phase diagram because the spin texture in each magnetic phase has a unique resonance response. This specificity gives MAS an advantage as compared to electrical measurements such as the topological Hall effect, [17][18][19][20][21][22] which is more difficult to interpret because the signals are not unique to skyrmion phases or helical phases. [19][20][21][22][23][24] In this letter, we present a study of spin-wave dynamics in a single crystal of B20 FeGe using MAS. Specifically, we measure the gigahertz frequency dynamic susceptibility of FeGe using a field-referenced lock-in technique, which significantly increases our sensitivity to magnetic phase boundaries as compared to conventional MAS. 15 We observe the resonance response in all the magnetic phases (field polarized, conical, helical and...

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“…For the efficiency of photocatalytic water splitting to improve, the photocatalyst must respond well to visible light, which covers approximately 50% of the energy range of the entire solar spectrum. [7] Another crucial requirement is that photoexcited electrons and holes must effectively separate and quickly transfer to the surfaces of photocatalysts for redox reactions.…”

Section: Introductionmentioning

confidence: 99%

Ternary chalcogenides XGaS₂ (X = Ag or Cu) for photocatalytic hydrogen generation from water splitting under irradiation of visible light

Liu

Yang

Wang

et al. 2020

Int J of Quantum Chemistry

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Ternary chalcogenide silver gallium sulfide (AgGaS2), which has an orthorhombic structure, was already synthesized. However, the feasibility of using the crystal for hydrogen production through photocatalytic water splitting has not been explored. Here, we systematically investigated the structural, electronic, optical, and transport properties of XGaS2 (X = Ag or Cu) with orthorhombic structure by using the first principles calculations. The band alignments indicate that all calculated absolute potentials of the valence and conduction band edges met the requirement of photocatalytic water splitting reaction. The presence of 2.64 and 2.56 eV direct band energy gaps and obvious optical absorption within the visible light range imply that XGaS2 can correspond to solar light. Moreover, the large electron mobility and the obvious differences between electron mobility and hole mobility were identified in XGaS2 structures, which is beneficial to the photocatalytic performance of the water splitting reaction. The present findings can provide a helpful reference for developing novel photocatalytic materials with XGaS2 for hydrogen generation from water splitting under irradiation of visible light.

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Liet al.Reply

Cited by 40 publications

References 4 publications

Topological excitations in rotating Bose-Einstein condensates with Rashba-Dresselhaus spin-orbit coupling in a two-dimensional optical lattice

Topological excitations in rotating Bose-Einstein condensates with Rashba-Dresselhaus spin-orbit coupling in a two-dimensional optical lattice

Topological spin dynamics in cubic FeGe near room temperature

Ternary chalcogenides XGaS₂ (X = Ag or Cu) for photocatalytic hydrogen generation from water splitting under irradiation of visible light

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Liet al.Reply

Cited by 40 publications

References 4 publications

Topological excitations in rotating Bose-Einstein condensates with Rashba-Dresselhaus spin-orbit coupling in a two-dimensional optical lattice

Topological excitations in rotating Bose-Einstein condensates with Rashba-Dresselhaus spin-orbit coupling in a two-dimensional optical lattice

Topological spin dynamics in cubic FeGe near room temperature

Ternary chalcogenides XGaS2 (X = Ag or Cu) for photocatalytic hydrogen generation from water splitting under irradiation of visible light

Contact Info

Product

Resources

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Ternary chalcogenides XGaS₂ (X = Ag or Cu) for photocatalytic hydrogen generation from water splitting under irradiation of visible light