Signature of chiral fermion instability in the Weyl semimetal TaAs above   the quantum limit
  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. 
Cheng-Long Zhang, Bingbing Tong, Zhujun Yuan, Ziquan Lin, Junfeng   Wang, Jinglei Zhang, Chuan-Ying Xi, Zhong Wang, Shuang J...
cond-mat.mes-hall