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We report on a study of electronic transport in semi-metallicBi$_{0.96}$Sb$_{0.04}$. At zero field, the system is a very dilute Fermi liquiddisplaying a T$^{2}$ resistivity with an enhanced prefactor. Quantumoscillations in resistivity as well as in Hall, Nernst and Seebeck responses ofthe system are detectable and their period quantifies the shrinking of theFermi surface with antimony doping. For a field along the trigonal axis, thequantum limit was found to occur at a field as low as 3T. An ultraquantumanomaly at twice this field was detected in both charge transport and Nernstresponse. Its origin appears to lie beyond the one-particle picture and linkedto unidentified many-body effects.

Transport anomalies across the quantum limit in semimetallic Bi$_{0.96}$Sb$_{0.04}$