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Spin-to-Charge Conversion in Magnetic Weyl Semimetals
- Source :
- Physical review letters. 123(18)
- Publication Year :
- 2019
-
Abstract
- Weyl semimetals (WSMs) are a newly discovered class of quantum materials which can host a number of exotic bulk transport properties, such as the chiral magnetic effect, negative magneto-resistance, and the anomalous Hall effect. In this work, we investigate theoretically the spin-to-charge conversion in a bilayer consisting of a magnetic WSM and a normal metal (NM), where a charge current can be induced in the WSM by an spin current injection at the interface. We show that the induced charge current exhibits a peculiar anisotropy: it vanishes along the magnetization orientation of the magnetic WSM, regardless of the direction of the injected spin. This anisotropy originates from the unique band structure of magnetic WSMs and distinguishes the spin-to-charge conversion effect in WSM/NM structures from that observed in other systems, such as heterostructures involving heavy metals or topological insulators. The induced charge current depends strongly on injected spin orientation, as well as on the position of the Fermi level relative to the Weyl nodes and the separation between them. These dependencies provide additional means to control and manipulate spin-charge conversion in these topological materials.<br />7 pages with an appendix, 2 figures
- Subjects :
- Physics
Quantum Physics
Magnetoresistance
Condensed matter physics
Condensed Matter - Mesoscale and Nanoscale Physics
Fermi level
FOS: Physical sciences
General Physics and Astronomy
Charge (physics)
Applied Physics (physics.app-ph)
Physics - Applied Physics
01 natural sciences
Magnetization
symbols.namesake
Hall effect
Topological insulator
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
0103 physical sciences
symbols
Condensed Matter::Strongly Correlated Electrons
Quantum Physics (quant-ph)
010306 general physics
Anisotropy
Spin-½
Subjects
Details
- ISSN :
- 10797114
- Volume :
- 123
- Issue :
- 18
- Database :
- OpenAIRE
- Journal :
- Physical review letters
- Accession number :
- edsair.doi.dedup.....255773f314235b9382edac49375abe70