物理学进展

物理学进展 ›› 2026, Vol. 46 ›› Issue (1): 1-12.doi: 10.13725/j.cnki.pip.2026.01.001

所属专题： 2026年, 第46卷

• •    下一篇

石墨烯量子霍尔边缘间的负库仑拖拽

宋珺威1*，甘祺康1*，朱 旺1，渡边贤司2，谷口尚3，于葛亮1，王 雷1,4   

  1. 1. 南京大学物理学院，固体微结构物理国家重点实验室，人工微结构科学与技术协同创新中心，南京 210093 2. 日本国立物质材料科学研究所，电子与光功能材料研究中心，筑波 305-0044，日本 3. 日本国立物质材料科学研究所，材料纳米建筑学研究中心，筑波 305-0044，日本 4. 江苏省物理科学研究院，南京 210093
  • 出版日期:2026-02-20 发布日期:2026-02-24
  • 基金资助:
    国家重点研发计划（批准号：2022YFA1204700，2021YFA1400400）、国家自然科学基金（批准号：12525403）、江苏省自然科学基金（批准号：BK20220066，BK20233001）以及江苏省双创人才计划（批准号：JSSCTD202101）; 日本学术振兴会科研费（批准号：21H05233和23H02052）以及日本文部科学省世界顶尖国际研究中心计划（WPI）

Negative Coulomb drag between graphene quantum Hall edges

SONG Junwei1, GAN Qikang1, ZHU Wang1, WATANABE Kenji2, TANIGUCHI Takashi3, YU Geliang1, WANG Lei1,4   

  1. 1. National Laboratory of Solid-State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Physics, Nanjing University, Nanjing 210093, China 2. Research Center for Electronic and Optical Materials, National Institute for Materials Science, Tsukuba 305-0044, Japan 3. Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba 305-0044, Japan 4. Jiangsu Physical Science Research Center, Nanjing 210093, China
  • Online:2026-02-20 Published:2026-02-24
  • Supported by:

    National Key Projects for Research and Development of China (Grant Nos. 2022YFA1204700, 2021YFA1400400), National Natural Science Foundation of China (Grant No. 12525403), Natural Science Foundation of Jiangsu Province (Grant Nos. BK20220066, BK20233001) and Program for Innovative Talents and Entrepreneur in Jiangsu (Grant No.JSSCTD202101). K.W. and T.T. acknowledge support from the JSPS KAKENHI (Grant Numbers 21H05233 and 23H02052) and World Premier International Research Center Initiative (WPI), MEXT, Japan.

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摘要：

库仑拖曳是指当电流通过一层导电层时，会在邻近且电学隔离的另一层中产生电压，这一 效应完全由载流子之间的层间库仑相互作用引起。该现象已在多种体系中得到广泛研究，包括平 行纳米线、双量子阱以及双层石墨烯。在本工作中，我们报道了一种新型体系中库仑拖曳的观测 结果，该体系由两层石墨烯组成，层间在同一平面内横向分隔 30 nm，表现出与垂直石墨烯异质 结构不同的行为。实验结果显示，在施加垂直磁场时可在相邻的石墨烯边缘处出现明显的负拖曳 电阻，当通过栅压将两层石墨烯的载流子浓度调至电荷中性点时，负拖曳达到最大值。本工作建 立了一个分立且空间上邻近的量子霍尔边缘系统，为探索一维体系间的电子相互作用物理提供了 新的实验平台。

关键词: 负库仑拖拽, 量子霍尔边缘, 范德瓦耳斯异质结

Abstract:

Coulomb drag refers to the phenomenon in which a current driven through one conducting layer induces a voltage nearby, electrically isolated layer sorely through interlayer Coulomb interactions between charge carriers. It has been extensively studied in various systems, including parallel nanowires, double quantum wells, and double-layer graphene. Here, we report the observation of Coulomb drag in a novel system consisting of two graphene layers separated laterally by a 30 nm gap within the material plane, exhibiting behavior distinct from that in vertical graphene heterostructures. Our experiments reveal pronounced negative drag resistances under an out-of-plane magnetic field at the quantum Hall edges, reaching a maximum when the carrier densities in both graphene layers are tuned to the charge neutrality point via gate voltages. Our work establish two separate and spatially closed quantum Hall edge modes as a new platform to explore electronic interaction physics between one dimensional systems.

Key words: negative Coulomb drag, quantum Hall edges, van der Waals heterostructures

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