Last decade brought an invasion of relativity into condensed matter physics. Spin Hall effect, topological insulators, graphene, Weyl/Dirac semimetals are among the prominent examples relying on relativistic quantum mechanics which can be grouped under the field of spintronics and its spin-offs. In my actual research I focus on exploring and inventing new emergent phenomena and mechanism within the realm of spinorbitronics and topological semimetals. We are considering effects combining challenges of fundamental physics problems (simulation of quantum field theory in solid state systems) and potentially industrially relevant nanodevices (anisotropic magnetoresistance and spin-orbit torque reading and writing of magnetic information). In collaboration with Prague, Cambridge, Jülich and Nottingham we investigate the new field of antiferromagnetic spintronics where some useful non-relativistic effects known from ferromagnets are not efficient or abandoned and thus relativistic effects can be of vital importance.
Current projects and interests:
- Relativistic fermions in antiferromagnets (AFM). Three-dimensional variants of graphene are prommising candidates for future low power consumption nanoelectronic devices.
- Anisotropic magnetoresistance and spin-orbit torque (SOT) in Heusler alloys. SOT was demonstrated at room temperature in NiMnSb microbars: Press release .
- Symmetries and galvanomagnetic effects in non-collinear AFM. Magnetic texture of noncollinear AFM support the existence of anomalous and topological Hall effect.
Keywords: relativistic quantum mechanics, ab initio transport theory, DFT calculations (FLAPW, TBLMTO + CPA), minimal models; anisotropic magnetoresistance, spin Hall effect, anomalous Hall effect, spin-orbit torque, Dirac and Weyl fermions, magnetization dynamics, spin waves; antiferromagnets, topological semimetals, half-metalic ferromagnets.
- “Route towards Dirac and Weyl antiferromagnetic spintronics”. L. Šmejkal, T. Jungwirth, and J. Sinova
- “Electric Control of Dirac Quasiparticles by Spin-Orbit Torque in an Antiferromagnet”. L. Šmejkal, J. Železný, J. Sinova, and T. Jungwirth
- “Room-temperature spin-orbit torque in NiMnSb”. C. Ciccarelli, L. Anderson, A. J. Ferguson, C. Gould, J. Gayles, J. Železný, L. Šmejkal, Y. Zhe, J. Sinova, F. Freimuth, and T. Jungwirth
Recent and upcoming conferences
- 2017 June, Spin dynamics in the Dirac systems (Germany), talk: Topological Antiferromagnetic Spintronics: from Néel spin-orbit torques to Dirac fermions
- 2016 September, Antiferromagnetic spintronics conference (Germany), talk: Route towards topological antiferromagnetic spin-orbitronics Route towards topological antiferromagnetic spintronics
- 2016 June, SPICE Young Research Leaders 2016 workshop in Mainz (Germany), talk: Electrical control of Dirac fermions. .
- 2016 March, DPG meeting in Regensburg (Germany), talk: Controlling relativistic fermions in antiferromagnets.