Wan, BoBoWanSchindler, FrankFrankSchindlerWang, KeKeWangWu, KaiKaiWuWan, XiangangXiangangWanNeupert, TitusTitusNeupertLu, Hai-ZhouHai-ZhouLu2023-08-152023-08-152018-12-19Journal of Physics: Condensed Matter, 2018, 30 (50), pp.1-90953-8984http://hdl.handle.net/10044/1/105898Negative magnetoresistance is rare in non-magnetic materials. Recently, negative magnetoresistance has been observed in the quantum limit of β-Ag2Se, where only one band of Landau levels is occupied in a strong magnetic field parallel to the applied current. β-Ag2Se is a material that hosts a Kramers Weyl cone with band degeneracy near the Fermi energy. Kramers Weyl cones exist at time-reversal invariant momenta in all symmorphic chiral crystals, and at a subset of these momenta, including the Γ point, in non-symmorphic chiral crystals. Here, we present a theory for the negative magnetoresistance in the quantum limit of Kramers Weyl semimetals. We show that, although there is a band touching similar to those in Weyl semimetals, negative magnetoresistance can exist without a chiral anomaly. We find that it requires screened Coulomb scattering potentials between electrons and impurities, which is naturally the case in β-Ag2Se.© 2018 IOP Publishing Ltd0204 Condensed Matter Physics0912 Materials Engineering1007 NanotechnologyFluids & PlasmasJournal Articlehttps://www.dx.doi.org/10.1088/1361-648X/aaebedhttps://iopscience.iop.org/article/10.1088/1361-648X/aaebed1361-648X