title: π Berry phase and Zeeman splitting of Weyl semimetal TaP.
abstract: The recent breakthrough in the discovery of Weyl fermions in monopnictide semimetals provides opportunities to explore the exotic properties of relativistic fermions in condensed matter. The chiral anomaly-induced negative magnetoresistance and π Berry phase are two fundamental transport properties associated with the topological characteristics of Weyl semimetals. Since monopnictide semimetals are multiple-band systems, resolving clear Berry phase for each Fermi pocket remains a challenge. Here we report the determination of Berry phases of multiple Fermi pockets of Weyl semimetal TaP through high field quantum transport measurements. We show our TaP single crystal has the signatures of a Weyl state, including light effective quasiparticle masses, ultrahigh carrier mobility, as well as negative longitudinal magnetoresistance. Furthermore, we have generalized the Lifshitz-Kosevich formula for multiple-band Shubnikov-de Haas (SdH) oscillations and extracted the Berry phases of π for multiple Fermi pockets in TaP through the direct fits of the modified LK formula to the SdH oscillations. In high fields, we also probed signatures of Zeeman splitting, from which the Landé g-factor is extracted.
authors.affiliation: Department of physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA.
authors.forename: J
authors.initials: J
authors.lastname: Hu
authors.affiliation: Department of physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA.
authors.forename: J Y
authors.initials: JY
authors.lastname: Liu
authors.affiliation: National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA.
authors.forename: D
authors.initials: D
authors.lastname: Graf
authors.affiliation: Advanced Materials Research Institute and Department of Physics, University of New Orleans, New Orleans, Louisiana 70148, USA.
authors.forename: S M A
authors.initials: SM
authors.lastname: Radmanesh
authors.affiliation: Advanced Materials Research Institute and Department of Physics, University of New Orleans, New Orleans, Louisiana 70148, USA.
authors.forename: D J
authors.initials: DJ
authors.lastname: Adams
authors.affiliation: Department of physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA.
authors.forename: A
authors.initials: A
authors.lastname: Chuang
authors.affiliation: Department of physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Wang
authors.affiliation: National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA.|Department of Physics, Florida State University, Tallahassee, Florida 32306, USA.
authors.forename: I
authors.initials: I
authors.lastname: Chiorescu
authors.affiliation: Department of physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA.
authors.forename: J
authors.initials: J
authors.lastname: Wei
authors.affiliation: Advanced Materials Research Institute and Department of Physics, University of New Orleans, New Orleans, Louisiana 70148, USA.
authors.forename: L
authors.initials: L
authors.lastname: Spinu
authors.affiliation: Department of physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA.
authors.forename: Z Q
authors.initials: ZQ
authors.lastname: Mao