28–31 Aug 2018
EPFL
Europe/Zurich timezone

【615】 Magnetoresistance from Fermi surface topology

31 Aug 2018, 12:30
15m
CE 2 (EPFL)

CE 2

EPFL

Talk Advances in Topological Materials Advances in Topological Materials

Speaker

Dr Shengnan Zhang (Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland and National Centre for Computational Design and Discovery of Novel Materials MARVEL, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland)

Description

Magnetoresistance of both topologically trivial and nontrivial materials was extensively studied during past few years. Different mechanisms were proposed to explain the magnetotransport properties, such as the extremely large non-saturating magnetoresistance observed in a number of materials, without arriving to definitive conclusions. By combining of ab initio calculations based on DFT with the Boltzmann transport theory we systematically investigate magnetoresistance in a large number of materials for magnetic field is applied perpendicular to the applied current. We show that the Fermi surface topology plays very important role in magnetoresistance, especially in explaining its anisotropy. We further focus on selected materials, e.g. copper and bismuth, finding very good agreement with experiment results.

Primary author

Dr Shengnan Zhang (Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland and National Centre for Computational Design and Discovery of Novel Materials MARVEL, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland)

Co-authors

Dr QuanSheng Wu (Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland and National Centre for Computational Design and Discovery of Novel Materials MARVEL, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland) Prof. Yi Liu (The Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University, 100875 Beijing, China) Prof. Oleg Yazyev (Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland and National Centre for Computational Design and Discovery of Novel Materials MARVEL, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland)

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