Bulk bismuth has a complex Landau spectrum. The small effective masses and the large g-factors are anisotropic. The chemical potential drifts at high magnetic fields. Moreover, twin boundaries further complexify the interpretation of the data by producing extra anomalies in the extreme quantum limit. Here, we present a study of angle dependence of magnetoresistance up to 65 T in bismuth complemented with Nernst, ultrasound, and magneto-optic data. All observed anomalies can be explained in a single-particle picture of a sample consisting of two twinned crystals tilted by 108° and with two adjacent crystals keeping their own chemical potentials despite a shift between chemical potentials as large as 68 meV at 65 T. This implies an energy barrier between adjacent twinned crystals reminiscent of a metal- semiconductor Schottky barrier or a p-n junction. We argue that this barrier is built by accumulating charge carriers of opposite signs across a twin boundary.

块状铋具有复杂的朗道光谱。小的有效质量和大的 g 因子是各向异性的。化学势在高磁场下发生漂移。此外，孪生边界通过在极端量子极限下产生额外的异常，进一步复杂化了数据的解释。在这里，我们提出了一项关于铋磁阻高达 65 T 的角度依赖性的研究，并辅以能斯特、超声和磁光数据。所有观察到的异常现象都可以用样品的单粒子图片来解释，该样品由两个倾斜 108° 的孪晶晶体组成，并且两个相邻的晶体保持自己的化学势，尽管在 65 T 时化学势之间的变化高达 68 meV。意味着相邻孪晶之间的能量势垒，让人想起金属半导体肖特基势垒或 pn 结。我们认为，这个势垒是通过跨越孪生边界累积相反符号的电荷载流子而建立的。