Abstract At low temperatures, graphite presents a magnetoresistance anomaly which manifests as a transition to a high-resistance state (HRS) above a certain critical magnetic field Bc. Such HRS is currently attributed to a c-axis charge-density-wave taking place only when the lowest Landau level is populated. By controlling the charge carrier concentration of a gated sample through its charge neutrality level (CNL), we were able to experimentally modulate the HRS in graphite for the first time. We demonstrate that the HRS is triggered both when electrons and holes are the majority carriers but is attenuated near the CNL. Taking screening into account, our results indicate that the HRS possess a strong in-plane component and can occur below the quantum limit, being at odds with the current understanding of the phenomenon. We also report the effect of sample thickness on the HRS.

中文翻译：

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驯服石墨中的磁阻异常

摘要 在低温下，石墨呈现出磁阻异常，表现为在高于某个临界磁场 Bc 时向高阻态（HRS）转变。这种 HRS 目前归因于 c 轴电荷密度波，仅当最低的朗道能级有人居住时才会发生。通过通过其电荷中性水平 (CNL) 控制门控样品的电荷载流子浓度，我们首次能够通过实验调节石墨中的 HRS。我们证明了当电子和空穴是多数载流子但在 CNL 附近衰减时，会触发 HRS。考虑到筛选，我们的结果表明 HRS 具有很强的面内分量，并且可能发生在量子极限以下，这与目前对该现象的理解不一致。