Emergent quantum Hall effects below 50 mT in a two-dimensional topological insulator
Saquib Shamim, Wouter Beugeling, J. Böttcher, Pragya Shekhar, Andreas Budewitz, Philipp Leubner, Lukas Lunczer, Ewelina M. Hankiewicz, H. Buhmann, L. W. Molenkamp
Abstract
-regime, we resolve quantum Hall plateaus at fields as low as 20 to 30 mT, where transport is dominated by a van Hove singularity in the valence band. These emergent quantum Hall phenomena rely critically on the topological band structure of HgTe, and their occurrence at very low fields makes them an ideal candidate for realizing chiral Majorana fermions.
Topics & Concepts
Topological insulatorQuantum Hall effectInsulator (electricity)PhysicsQuantumCondensed matter physicsTopology (electrical circuits)BiologyQuantum mechanicsOptoelectronicsMathematicsElectronCombinatoricsTopological Materials and PhenomenaQuantum and electron transport phenomenaGraphene research and applications