Signature of chiral fermion instability in the Weyl semimetal TaAs above the quantum limit

Bingbing Tong; Cheng-Long Zhang; Chi Zhang; Chuan-Ying Xi; Jinglei Zhang; Junfeng Wang; Shuang Jia; Zhong Wang; Zhujun Yuan; Ziquan Lin

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Signature of chiral fermion instability in the Weyl semimetal TaAs above the quantum limit

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arxiv 1601.05895 v2 pith:ADEFBEBJ submitted 2016-01-22 cond-mat.mes-hall

Signature of chiral fermion instability in the Weyl semimetal TaAs above the quantum limit

Cheng-Long Zhang , Bingbing Tong , Zhujun Yuan , Ziquan Lin , Junfeng Wang , Jinglei Zhang , Chuan-Ying Xi , Zhong Wang

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Shuang Jia Chi Zhang

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keywords weylsemimetaltaasanomaliesinstabilityaboveascribedchiral

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We report the electrical transport properties for Weyl semimetal TaAs in an intense magnetic field. Series of anomalies occur in the longitudinal magnetoresistance and Hall signals at ultra-low temperatures when the Weyl electrons are confined into the lowest Landau level. These strongly temperature-dependent anomalies are ascribed to the electron-hole pairing instability. Our measurements show that the Weyl semimetal TaAs in the ultraquantum regime provides a good platform for studying electron-electron interaction in topological nontrivial semimetals.

Signature of chiral fermion instability in the Weyl semimetal TaAs above the quantum limit

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