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Luca Maranzana, Koki Shinada, Ying-Ming Xie, Sergey Artyukhin et autres
The geometry of electronic quantum states plays an important role in the equilibrium and transport properties of solids. While the Berry curvature is known to influence electron motion, recent work has shown that the quantum metric also affects the motion of electron …
Luca Maranzana, Koki Shinada, Ying-Ming Xie, Sergey Artyukhin et autres
The geometry of electronic quantum states plays an important role in the equilibrium and transport properties of solids. While the Berry curvature is known to influence electron motion, recent work has shown that the quantum metric also affects the motion of electron …
it, jp, se (code pays fourni par la source)
We propose a new classification of magnetic textures from the viewpoint of differential geometry. Magnetic textures are conventionally classified into collinear, coplanar, and noncoplanar magnets. These classes are typically characterized by the vector spin chirality (VSC) and the scalar spin chirality (SSC), …
The quantum geometric tensor (QGT) provides nontrivial bounds among physical quantities, as exemplified by the metric curvature inequality. How far can this idea be generalized, and what other observables obey such quantum-geometric constraints? The authors show here that generalized QGTs yield new …
jp (code pays fourni par la source)
Jun Ōiké, Robert Peters, Koki Shinada
The discovery of unconventional antiferromagnets, such as altermagnets, has drawn significant attention to higher-rank magnetic multipoles, particularly magnetic octupoles. Despite the advances in research, attempts to understand their microscopic properties remain limited due to the unbounded nature of the position operator in …
jp (code pays fourni par la source)
The quantum geometric tensor (QGT) provides nontrivial bounds among physical quantities, as exemplified by the metric-curvature inequality. In this paper, we investigate various bounds for different observables through certain generalizations of the QGT. First, we demonstrate that bounds hold for all linear …
Jun Ōiké, Koki Shinada, Robert Peters
Extensive investigation has recently been conducted into a new class of antiferromagnetic order known as magnetic octupole order. However, the high rank of octupoles makes it difficult to detect and manipulate them by using conventional methods such as the anomalous Hall effect. …
jp (code pays fourni par la source)
Two thermodynamic relations are proposed for the exact measurement of the center-of-mass (COM) momentum of the Cooper pairs in helical superconductors. The first relation concerns the constraint on the change in the COM momentum in response to the variation in the magnetic …
We present the optical activity induced by the orbital magnetic moment in metals and superconductors using Green's function formalization. Usually, an apparent singularity of the optical activity vanishes in the normal state; however, we show that it remains finite in the superconducting …
jp (code pays fourni par la source)
We present general properties of the optical activity in noncentrosymmetric materials, including superconductors. We derive a sum rule of the optical activity in general electric states and show that the summation of the spectrum is zero, which is independent of the details …
jp (code pays fourni par la source)
We present general properties of the optical activity in noncentrosymmetric materials, including superconductors. We derive a sum rule of the optical activity in general electric states and show that the summation of the spectrum is zero, which is independent of the details …
We propose a fully quantum-mechanical formalism for the temperature-gradient-induced orbital magnetoelectric effect in systems without spatial inversion symmetry, $\mathcal{P}$, and time-reversal symmetry $\mathcal{T}$. The effect consists of two parts, i.e., an extrinsic part and an intrinsic part. We demonstrate that for the …
jp (code pays fourni par la source)
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