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RESEARCH PRODUCT
Electric Control of Dirac Quasiparticles by Spin-Orbit Torque in an Antiferromagnet
Jairo SinovaJairo SinovaTomas JungwirthTomas JungwirthJ. ŽEleznýJ. ŽEleznýLibor ŠMejkalLibor ŠMejkalLibor ŠMejkalsubject
PhysicsCondensed Matter - Mesoscale and Nanoscale PhysicsMagnetoresistanceCondensed matter physicsDirac (software)FOS: Physical sciencesGeneral Physics and Astronomy02 engineering and technology021001 nanoscience & nanotechnology01 natural sciencesSymmetry (physics)3. Good healthMinimal modelsymbols.namesakeDirac fermionQuantum mechanicsMesoscale and Nanoscale Physics (cond-mat.mes-hall)0103 physical sciencesQuasiparticlesymbolsAntiferromagnetismCondensed Matter::Strongly Correlated Electrons010306 general physics0210 nano-technologySpin-½description
Spin-orbitronics and Dirac quasiparticles are two fields of condensed matter physics initiated independently about a decade ago. Here we predict that Dirac quasiparticles can be controlled by the spin-orbit torque reorientation of the N\'{e}el vector in an antiferromagnet. Using CuMnAs as an example, we formulate symmetry criteria allowing for the co-existence of Dirac quasiparticles and N\'{e}el spin-orbit torques. We identify the non-symmorphic crystal symmetry protection of Dirac band crossings whose on and off switching is mediated by the N\'{e}el vector reorientation. We predict that this concept, verified by minimal model and density functional calculations in the CuMnAs semimetal antiferromagnet, can lead to a topological metal-insulator transition driven by the N\'{e}el vector and to the corresponding topological anisotropic magnetoresistance.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-10-25 | Physical Review Letters |