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Phonon-limited Transport and Fermi Arc Lifetime in Weyl Semimetals
Francesco Buccheri, Alessandro De Martino, Rodrigo G. Pereira +2
Weyl semimetals harbor topological Fermi-arc surface states which determine the nontrivial charge current response to external fields. We here study the quasiparticle decay rate of…
Transition of laser-induced terahertz spin currents from torque- to conduction-electron-mediated transport
Pilar Jiménez-Cavero, Oliver Gueckstock, Lukáš Nádvorník +16
Spin transport is crucial for future spintronic devices operating at bandwidths up to the terahertz (THz) range. In F|N thin-film stacks made of a ferro/ferrimagnetic layer F and a…
Higher-order topological semimetals and nodal superconductors with an order-two crystalline symmetry
Sophia Simon, Max Geier, Piet W. Brouwer
Using a systematic relation between topological gapless phases in three dimensions and topological gapped phases in two dimensions, we identify four types of higher-order topologic…
Ultrafast demagnetization of iron induced by optical vs terahertz pulses
A. L. Chekhov, Y. Behovits, J. J. F. Heitz +7
We study ultrafast magnetization quenching of ferromagnetic iron following excitation by an optical vs a terahertz pump pulse. While the optical pump (photon energy of 3.1 eV) indu…
Effective exchange interaction for terahertz spin waves in iron layers
Liane Brandt, Ulrike Ritzmann, Niklas Liebing +5
The exchange stiffness is a central material parameter of all ferromagnetic materials. Its value controls the Curie temperature as well as the dynamic properties of spin waves to a…
Equilibrium current in a Weyl-semimetal - superconductor heterostructure
Kevin A. Madsen, Piet W. Brouwer, Maxim Breitkreiz
A heterostructure consisting of a magnetic Weyl semimetal and a conventional superconductor exhibits an equilibrium current parallel to the superconductor interface and perpendicul…