Thermally stable quantum Hall effect in a gated ferroelectric-graphene heterostructure
Thermally stable quantum Hall effect in a gated ferroelectric-graphene heterostructure
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DOI：
10.1038/s42005-023-01340-8
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发表时间：
2023-08
影响因子：
5.5
通讯作者：
A. Dey;Nathan D Cottam;O. Makarovskiy;Wenjing Yan;V. Mišeikis;C. Coletti;J. Kerfoot;V. Korolkov;L. Eaves;J. Linnartz;A. Kool;S. Wiedmann;A. Patané
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文献类型：
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作者：
A. Dey;Nathan D Cottam;O. Makarovskiy;Wenjing Yan;V. Mišeikis;C. Coletti;J. Kerfoot;V. Korolkov;L. Eaves;J. Linnartz;A. Kool;S. Wiedmann;A. Patané
量子霍尔效应广泛用于研究基本现象，从拓扑相到复合费米子。特别是，石墨烯中室温电阻量子的发现对于可以在低温以上运行的紧凑电阻标准具有重要意义。然而，这需要只有少数高磁场设施才能达到的大磁场。在这里，我们报告了铁电绝缘体 CuInP2S6 封装的石墨烯中的量子霍尔效应。石墨烯通道的静电门控可以调节费米能量，从而使绝缘体局域态中的电子与石墨烯的载流离域态保持平衡。由于该混合系统中存在强束缚态，因此在相对适中的磁场中在较宽的温度范围内观察到量子霍尔平台。
The quantum Hall effect is widely used for the investigation of fundamental phenomena, ranging from topological phases to composite fermions. In particular, the discovery of a room temperature resistance quantum in graphene is significant for compact resistance standards that can operate above cryogenic temperatures. However, this requires large magnetic fields that are accessible only in a few high magnetic field facilities. Here, we report on the quantum Hall effect in graphene encapsulated by the ferroelectric insulator CuInP2S6. Electrostatic gating of the graphene channel enables the Fermi energy to be tuned so that electrons in the localized states of the insulator are in equilibrium with the current-carrying, delocalized states of graphene. Due to the presence of strongly bound states in this hybrid system, a quantum Hall plateau is observed over a wide range of temperatures in relatively modest magnetic fields.