Ultraquantum magnetoresistance in single-crystalline $\beta$-Ag${}_2$Se

Abstract

In the history of condensed matter physics, reinvestigation of a well-studied material with enhanced quality sometimes led to important scientific discoveries. A well-known example is the discovery of fractional quantum Hall effect in high quality GaAs/AlGaAs heterojunctions. Here we report the first single crystal growth and magnetoresistance (MR) measurements of the silver chalcogenide $\beta$-Ag${}_2$Se (Naumannite), a compound has been known for the unusual, linear-field-dependent MR in its polycrystalline form for over a decade. With the quantum limit (QL) as low as 3 Tesla, a moderate field produced by a superconductor magnet available in many laboratories can easily drive the electrons in Ag${}_2$Se to an unprecedented state. We observed significant negative longitudinal MR beyond the QL, which was understood as a `charge-pumping' effect between the novel fermions with opposite chiralities. Characterization of the single-crystalline Ag${}_2$Se and the fabrication of electric devices working above the QL, will represent a new direction for the study of these exotic electrons.

17 pages, 5 figures

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Cited by in corpus (17)

• Discovery of topological chiral crystals with helicoid arc states
• Weyl, Dirac and high-fold chiral fermions in topological quantum materials
• Topological Materials Discovery from Crystal Symmetry
• Twofold quadruple Weyl nodes in chiral cubic crystals
• Quasiparticle interference on type-I and type-II Weyl semimetal surfaces: a review
• Chiral anomalies in 3D spin-orbit coupled metals: electrical, thermal, and gravitational anomaly
• Transverse Peierls Transition
• Large Fermi-arc and robust Weyl semimetal phase in Ag${}_2$S
• Kramers-Weyl fermions in the chiral charge density wave material (TaSe${}_4$)${}_2$I
• Temperature induced first order electronic topological transition in $\beta$-Ag${}_2$Se
• Conservation of chirality at a junction between two Weyl semimetals
• Magnetic breakdown spectrum of a Kramers-Weyl semimetal
• Disentangling contributions to longitudinal magnetoconductivity for Kramers-Weyl nodes
• Spinor-dominated magnetoresistance driven by the topological phase transition in $\beta$-Ag${}_2$Se
• Giant and Linear Magnetoresistance in Liquid Metals at Ambient Temperature
• Magnetoresistance in the Extreme Quantum Limit: Field-Induced Crossover to the Unitarity Limit
• Theory for the negative longitudinal magnetoresistance in the quantum limit of Kramers Weyl semimetals