High Fermi velocities and small cyclotron masses in LaAlGe
Zhixiang Hu, Qianheng Du, Yu Liu, D. Graf, C. Petrovic
Abstract
We report quantum oscillation measurements of LaAlGe, a Lorentz-violating type-II Weyl semimetal with tilted Weyl cones. Very small quasiparticle masses and very high Fermi velocities were detected at the Fermi surface. Whereas three main frequencies have been observed, the angular dependence of two Fermi surface sheets indicates possible two-dimensional (2D) character despite the absence of the 2D structural features such as van der Waals bonds. Such conducting states may offer a good platform for low-dimensional polarized spin current in magnetic RAlGe (R = Ce, Pr) materials.
Topics & Concepts
PhysicsCondensed matter physicsQuasiparticleFermi Gamma-ray Space TelescopeQuantum oscillationsFermi surfaceOscillation (cell signaling)CyclotronFermi gasSpin (aerodynamics)Fermi levelWeyl semimetalSemimetalvan der Waals forceShubnikov–de Haas effectFermi contact interactionEffective mass (spring–mass system)Fermi energyMagnetic fieldCyclotron resonanceTopological Materials and Phenomena2D Materials and ApplicationsHeusler alloys: electronic and magnetic properties