Viscosity of disordered Dirac electrons

Chen, Weiwei; Zhu, Wei

doi:10.1103/physrevb.106.014205

Cited by 6 publications

(2 citation statements)

References 51 publications

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“…When the time-reversal symmetry is fruther broken in the system with a polar vector, a magnetic toroidal dipole occurs [18][19][20][21][22][23], which exhibits a linear magnetoelectric effect [24][25][26][27][28] and nonreciprocal transport [29][30][31][32]. Meanwhile, an axial vector that inverts under time-reversal operation gives rise to magnetization, which becomes the origin of the anomalous Hall effect in collinear [33][34][35][36][37], noncollinear [38][39][40][41][42], and noncoplanar magnets [43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Electric Ferro-Axial Moment as Nanometric Rotator and Source of Longitudinal Spin Current

2022

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We theoretically investigate electronic orderings with the electric axial moment without breakings of both spatial inversion and time-reversal symmetries in the zigzag-chain system. Especially, we elucidate the role of the local odd-parity hybridization arising from locally noncentrosymmetric lattice structures based on symmetry and microscopic model analyses. We show that the odd-parity crystalline electric field gives rise to an effective cross-product coupling between the electric dipole and electric toroidal dipole, the latter of which corresponds to the electric axial moment. As a result, the staggered component of the electric axial moment is induced by applying an external electric field, while its uniform component is induced via the appearance of staggered electric dipole ordering. We also show that uniform electric quadrupole ordering accompanies uniform electric axial moment. Furthermore, we discuss transverse magnetization as a consequence of the orderings with the uniform electric axial moment. Our results extend the scope of materials exhibiting electric axial ordering to those with locally noncentrosymmetric lattice structures.

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Section: Introductionmentioning

confidence: 99%

Electric Ferro-Axial Moment as Nanometric Rotator and Source of Longitudinal Spin Current

2022

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“…It exhibits a variety of physical phenomena depending on its spatial distribution of spin moments. For example, a collinear antiferromagnetic ordering can be the origin of the anomalous Hall effect, which is termed the crystal Hall effect [1][2][3][4][5][6][7][8][9][10][11][12]. Similarly, a noncoplanar antiferromagnetic ordering with a uniform distribution of the spin scalar chirality causes the anomalous Hall effect through the spin Berry phase mechanism [13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Ferroaxial moment induced by vortex spin texture

Hayami

2022

Phys. Rev. B

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The nature of an electric ferroaxial moment characterizing a time-reversal-even axial-vector quantity is theoretically investigated under magnetic orderings. We clarify that a vortex spin texture results in the emergence of the ferroaxial moment depending on the helicity. By introducing a multipole description, we show that the ferroaxial nature appears when two types of odd-parity magnetic multipoles become active under the vortex spin texture: One is the magnetic monopole and the other is the magnetic toroidal dipole. We present all the magnetic point groups to possess the ferroaxial moment in the presence of the magnetic orderings with the magnetic monopole and magnetic toroidal dipole. Moreover, we specifically consider a multiorbital model in a four-sublattice tetragonal system to demonstrate the ferroaxial moment induced by the vortex spin texture. We show that the ferroaxial moment is microscopically characterized by both the cluster-scale and atomic-scale axial-vector quantities: The former is described by the vortex of the local electric dipole and the latter is represented by the outer product of the local orbital and spin angular momenta. Moreover, we find that the atomic spin-orbit coupling and the hybridization between orbitals with different parity are key ingredients to induce the ferroaxial moment. We also apply the result to a magnetic skyrmion with a topologically nontrivial spin texture and discuss candidate materials.

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Terahertz bolometric detectors based on graphene field-effect transistors with the composite h-BN/black-P/h-BN gate layers using plasmonic resonances

Ryzhii,

Shur

et al. 2023

Journal of Applied Physics

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We propose and analyze the performance of terahertz (THz) room-temperature bolometric detectors based on the graphene channel field-effect transistors (GC-FET). These detectors comprise the gate barrier layer (BL) composed of the lateral hexagonal-boron nitride black-phosphorus/hexagonal-boron nitride (h-BN/b-P/h-BN) structure. The main part of the GC is encapsulated in h-BN, whereas a short section of the GC is sandwiched between the b-P gate BL and the h-BN bottom layer. The b-P gate BL serves as the window for the electron thermionic current from the GC. The electron mobility in the GC section encapsulated in h-BN can be fairly large. This might enable a strong resonant plasmonic response of the GC-FET detectors despite relatively lower electron mobility in the GC section covered by the b-P window BL. The narrow b-P window diminishes the Peltier cooling and enhances the detector performance. The proposed device structure and its operation principle promote elevated-temperature GC-FET THz detector responsivity values and other characteristics, especially at the plasmonic resonances.

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Viscosity of disordered Dirac electrons

Cited by 6 publications

References 51 publications

Electric Ferro-Axial Moment as Nanometric Rotator and Source of Longitudinal Spin Current

Electric Ferro-Axial Moment as Nanometric Rotator and Source of Longitudinal Spin Current

Ferroaxial moment induced by vortex spin texture

Terahertz bolometric detectors based on graphene field-effect transistors with the composite h-BN/black-P/h-BN gate layers using plasmonic resonances

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