Signature of quantum interference effect in inter-layer Coulomb drag in graphene-based electronic double-layer systems

Lijun Zhu, Xiaoqiang Liu, Lin Li (), Xinyi Wan, Ran Tao, Zhongniu Xie, Ji Feng () and Changgan Zeng ()
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Lijun Zhu: University of Science and Technology of China
Xiaoqiang Liu: Peking University
Lin Li: University of Science and Technology of China
Xinyi Wan: University of Science and Technology of China
Ran Tao: University of Science and Technology of China
Zhongniu Xie: University of Science and Technology of China
Ji Feng: Peking University
Changgan Zeng: University of Science and Technology of China

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract The distinguishing feature of a quantum system is interference arising from the wave mechanical nature of particles which is clearly central to macroscopic electronic properties. Here, we report the signature of quantum interference effect in inter-layer transport process. Via systematic magneto-drag experiments on graphene-based electronic double-layer systems, we observe low-field correction to the Coulomb-scattering-dominated inter-layer drag resistance in a wide range of temperature and carrier density, with its characteristics sensitive to the band topology of graphene layers. These observations can be attributed to a new type of quantum interference between drag processes, with the interference pathway comprising different carrier diffusion paths in the two constituent conductors. The emergence of such effect relies on the formation of superimposing planar diffusion paths, among which the impurity potentials from intermediate insulating spacer play an essential role. Our findings establish an ideal platform where the interplay between quantum interference and many-body interaction is essential.

Date: 2023
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DOI: 10.1038/s41467-023-37197-2

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