We theoretically investigate mechanical spin current generation via spin–orbit coupling on the basis of the generally covariant Dirac equation. In accelerating systems, the spin–orbit coupling is ...modified by inertial effects. Due to the augmented coupling, spin current is generated from rigid rotation and vibration. Renormalization of the inertial effects due to the interband mixing is also discussed by using the k·p perturbation.
•We investigate mechanical spin current generation via spin–orbit coupling.•SOC is modified by inertial effects due to mechanical motion.•Mechanical analogue of spin Hall effect is predicted.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
A magnetic field is predicted to emerge on a particle in a rotating material body even if the body is electrically neutral. This emergent field is called a Barnett field. We show that nuclear ...magnetic resonance (NMR) enables direct measurement of the Barnett field in solids. We rotated both a sample and an NMR coil synchronously at high speed and found an NMR shift whose sign reflects that of the nuclear magnetic moments. This result provides direct evidence of the Barnett field. The use of NMR for Barnett field measurement enables the unknown signs of nuclear magnetic moments in solids to be determined.
We study valley-dependent spin transport theoretically in monolayer transition-metal dichalcogenides in which a variety of spin and valley physics are expected because of spin-valley coupling. The ...results show that the spins are valley-selectively excited with appropriate carrier doping and valley polarized spin current (VPSC) is generated. The VPSC leads to the spin-current Hall effect, transverse spin accumulation originating from the Berry curvature in momentum space. The results indicate that spin excitations with spin-valley coupling lead to both valley and spin transport, which is promising for future low-consumption nanodevice applications.
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This work demonstrates markedly modified spin dynamics of magnetic insulator (MI) by the spin momentum-locked Dirac surface states of the adjacent topological insulator (TI), which can be harnessed ...for spintronic applications. As the Bi concentration
is systematically tuned in 5-nm-thick (Bi
Sb
)
Te
TI films, the weight of the surface relative to bulk states peaks at
= 0.32 when the chemical potential approaches the Dirac point. At this concentration, the Gilbert damping constant of the precessing magnetization in 10-nm-thick Y
Fe
O
MI films in the MI/TI heterostructures is enhanced by an order of magnitude, the largest among all concentrations. In addition, the MI acquires additional strong magnetic anisotropy that favors the in-plane orientation with similar Bi concentration dependence. These extraordinary effects of the Dirac surface states distinguish TI from other materials such as heavy metals in modulating spin dynamics of the neighboring magnetic layer.
Quantum Shot Noise in Magnon Transport Nakata, Kouki; Ohnuma, Yuichi; Matsuo, Mamoru
Meeting Abstracts of the Physical Society of Japan,
2019
Journal Article
Nuclear spin pumping by frequency pulling Ohnuma, Yuichi; Maekawa, Sadamichi; Matsuo, Mamoru
Meeting Abstracts of the Physical Society of Japan,
2019
Journal Article
We report a rare and therapeutically challenging case of a retroperitoneal lymphocele that developed after oblique lumbar interbody fusion (OLIF). A 74-year-old woman underwent spinal canal ...decompression between L2 and S1, OLIF between L2 and L5, and posterior lumbar interbody fusion (PLIF) at the L5/S1 level for management of severe lumbar pain secondary to lumbar kyphosis and intermittent claudication. Follow-up magnetic resonance imaging (MRI) performed 4 months postoperatively revealed a left-sided retroperitoneal cyst (maximum diameter 11 cm). The cyst did not communicate with the ureter, and the patient was asymptomatic ; therefore, she was followed up as an outpatient. The patient developed left lower leg pain 2 years postoperatively. We performed computed tomography (CT) guided cyst puncture and drainage, and the cyst was diagnosed as a lymphocele. Continuous drainage reduced the cyst volume, and the patient’s symptoms disappeared on day 5 ; however, she was not completely cured. She underwent lymphatic embolization using lipiodol and sclerotherapy using 5% povidone-iodine, which were ineffective. Subsequently, we performed laparoscopic fenestration ; however, we observed a recurrent infected cyst. She underwent repeat sclerotherapy using 1% pyoktanin ; however, she was unresponsive to this treatment and was finally cured following continuous drainage for approximately 8 months overall. Lymphatic vessels tend to become thicker toward the proximal side ; therefore, postoperative lymphatic leakage may occur following operative procedures performed near large vessels. In our case, lymphocele was attributed to the hemostatic procedure performed in the vicinity of the common iliac artery. Surgeons should remain mindful of the possibility of postoperative lymphocele formation even with the use of a lumbar lateral approach, following surgical procedures performed in close proximity to the abdominal aorta or common iliac artery.
The recently discovered Van der Waals antiferromagnets have suffered from the lack of a comprehensive method to study their magnetic properties. Here, we propose an ac intrinsic magnon spin Hall ...current driven by surface acoustic waves as a novel probe for such antiferromagnets. Our results pave the way towards mechanical detection and manipulation of the magnetic order in two-dimensional antiferromagnets. Furthermore, they will overcome the difficulties with weak magnetic responses inherent in the use of antiferromagnets and hence provide a building block for future antiferromagnetic spintronics.The recently discovered Van der Waals antiferromagnets have suffered from the lack of a comprehensive method to study their magnetic properties. Here, we propose an ac intrinsic magnon spin Hall current driven by surface acoustic waves as a novel probe for such antiferromagnets. Our results pave the way towards mechanical detection and manipulation of the magnetic order in two-dimensional antiferromagnets. Furthermore, they will overcome the difficulties with weak magnetic responses inherent in the use of antiferromagnets and hence provide a building block for future antiferromagnetic spintronics.
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