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We report the crystal and electronic structures of a non-centrosymmetricquasi-two-dimensional (2D), candidate of topological semimetal AuTe2Br. TheFermi surface of this layered compound consists of 2D-like, topological trivialelectron and non-trivial hole pockets which host a Dirac cone along the kzdirection. Our transport measurements on the single crystals show highlyanisotropic, compensated low-density electrons and holes, both of which exhibitultrahigh mobility at a level of 10^5cm^2V^-1s^-1 at low temperature. Thehighly mobile, compensated carriers lead a non-saturated, parabolicmagnetoresistance as large as 3*10^5 in single-crystalline AuTe2Br in amagnetic field up to 58 T.

Highly Mobile Carriers in a Candidate of Quasi-Two-Dimensional Topological Semimetal AuTe$_2$Br