scholarly journals Unconventional spin Hall effect and axial current generation in a Dirac semimetal

2016 ◽  
Vol 93 (14) ◽  
Author(s):  
Nobuyuki Okuma ◽  
Masao Ogata
Keyword(s):  
Hall Effect ◽  
Axial Current ◽  
Spin Hall Effect ◽  
Current Generation ◽  
Dirac Semimetal

Orbitronics: Mechanism of Orbital Current Generation and Dynamics

2020 ◽  
Vol 29 (10) ◽  
pp. 9-15
Author(s):  
Dongwook GO ◽  
Hyun-Woo LEE
Keyword(s):  
Hall Effect ◽  
Crystal Field ◽  
Degree Of Freedom ◽  
Spin Hall Effect ◽  
Current Generation ◽  
Orbital Degree

The orbital degree of freedom is often considered to be quenched in solids due to the potential of the crystal field. In contrast to such expectation, we showed recently that the orbital current can be electrically generated despite orbital quenching in equilibrium, leading to a phenomenon called the orbital Hall effect. In this article, we provide a pedagogical introduction to the concept of an orbital current in solids and the mechanism underlying the orbital Hall effect. We also discuss the relation between the orbital Hall effect and the spin Hall effect, as well as a way to utilize the orbital current in spin-orbitronic devices.

scholarly journals Spin current generation in organic antiferromagnets

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Makoto Naka ◽  
Satoru Hayami ◽  
Hiroaki Kusunose ◽  
Yuki Yanagi ◽  
Yukitoshi Motome ◽  
...  
Keyword(s):  
Hall Effect ◽  
Spin Current ◽  
Inorganic Materials ◽  
Spin Hall Effect ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Current Generation ◽  
Heavy Atoms ◽  
A Charge

Abstract Spin current–a flow of electron spins without a charge current–is an ideal information carrier free from Joule heating for electronic devices. The celebrated spin Hall effect, which arises from the relativistic spin-orbit coupling, enables us to generate and detect spin currents in inorganic materials and semiconductors, taking advantage of their constituent heavy atoms. In contrast, organic materials consisting of molecules with light elements have been believed to be unsuited for spin current generation. Here we show that a class of organic antiferromagnets with checker-plate type molecular arrangements can serve as a spin current generator by applying a thermal gradient or an electric field, even with vanishing spin-orbit coupling. Our findings provide another route to create a spin current distinct from the conventional spin Hall effect and open a new field of spintronics based on organic magnets having advantages of small spin scattering and long lifetime.

scholarly journals Large spin current generation by the spin Hall effect in mixed crystalline phase Ta thin films

2018 ◽  
Vol 98 (10) ◽  
Author(s):  
Akash Kumar ◽  
Rajni Bansal ◽  
Sujeet Chaudhary ◽  
Pranaba Kishor Muduli
Keyword(s):  
Thin Films ◽  
Hall Effect ◽  
Crystalline Phase ◽  
Spin Current ◽  
Spin Hall Effect ◽  
Current Generation ◽  
Large Spin

scholarly journals Semi-quantized Spin Pumping and Spin-Orbit Torques in Topological Dirac Semimetals

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Takahiro Misawa ◽  
Kentaro Nomura
Keyword(s):  
Hall Effect ◽  
Spin Current ◽  
Spin Hall Effect ◽  
Spin Torque ◽  
Local Magnetization ◽  
Spin Pumping ◽  
Dirac Semimetal ◽  
Inverse Effect ◽  
Development Processes ◽  
Dirac Semimetals

AbstractWe study the time-development processes of spin and charge transport phenomena in a topological Dirac semimetal attached to a ferromagnetic insulator with a precessing magnetization. Compared to conventional normal metals, topological Dirac semimetals manifest a large inverse spin Hall effect when a spin current is pumped from the attached ferromagnetic insulator. It is shown that the induced charge current is semi-quantized, i.e., it depends only on the distance between the two Dirac points in momentum space and hardly depends on the disorder strength when the system remains in the topological Dirac semimetal phase. As an inverse effect, we show that the electric field applied to the topological Dirac semimetal exerts a spin torque on the local magnetization in the ferromagnetic insulator via the exchange interaction and the semi-quantized spin Hall effect. Our study demonstrates that the topological Dirac semimetal offers a less-dissipative platform for spin-charge conversion and spin switching.

scholarly journals Erratum: Giant photonic spin Hall effect near the Dirac points [Phys. Rev. A 101 , 023826 (2020)]

2020 ◽  
Vol 101 (6) ◽  
Author(s):  
Wenhao Xu ◽  
Qiang Yang ◽  
Guangzhou Ye ◽  
Weijie Wu ◽  
Wenshuai Zhang ◽  
...  
Keyword(s):  
Hall Effect ◽  
Spin Hall Effect

scholarly journals Spin Hall effect generated by fluctuating vortices in type-II superconductors

2021 ◽  
Vol 103 (13) ◽  
Author(s):  
Takuya Taira ◽  
Yusuke Kato ◽  
Masanori Ichioka ◽  
Hiroto Adachi
Keyword(s):  
Hall Effect ◽  
Spin Hall Effect ◽  
Type Ii ◽  
Type Ii Superconductors
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