B S alloys are of special significance in topological insulator research. Here we focus on the Bi0.96Sb0.04 alloy in which the conduction band edge just touches the valence band edge. Transport measurements show quantum oscillations in the longitudinal (Shubnikov–de Haas effect) and transverse magnetoresistance originating from a spheroidal Fermi surface pocket. Further investigation of the longitudinal magnetoresistance for the magnetic field parallel to the electrical current shows a small nonmonotonic magnetoresistance that is attributed to a competition of weak-antilocalization effects and a topological term related to the chiral anomaly.

中文翻译：

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Bi0.96Sb0.04 单晶中的量子振荡和手性异常

BS合金在拓扑绝缘体研究中具有特殊意义。在这里，我们关注导带边缘刚好接触价带边缘的 Bi0.96Sb0.04 合金。传输测量显示纵向（舒布尼科夫-德哈斯效应）和横向磁阻中的量子振荡源自球状费米表面袋。对平行于电流的磁场的纵向磁阻的进一步研究显示了一个小的非单调磁阻，这归因于弱反定位效应的竞争和与手性异常相关的拓扑项。