Article Interplay of Landau Quantization and Interminivalley Scatterings in a Weakly Coupled Moiré Superlattice

Yalong Yuan ; Le Liu ; Jundong Zhu ; Jingwei Dong ; Yanbang Chu ; Fanfan Wu ; Luojun Du ; Kenji Watanabe SAMURAI ORCID (National Institute for Materials Science) ; Takashi Taniguchi SAMURAI ORCID (National Institute for Materials Science) ; Dongxia Shi ; Guangyu Zhang ; Wei Yang

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Yalong Yuan, Le Liu, Jundong Zhu, Jingwei Dong, Yanbang Chu, Fanfan Wu, Luojun Du, Kenji Watanabe, Takashi Taniguchi, Dongxia Shi, Guangyu Zhang, Wei Yang. Interplay of Landau Quantization and Interminivalley Scatterings in a Weakly Coupled Moiré Superlattice. Nano Letters. 2024, 24 (22), 6722-6729. https://doi.org/10.1021/acs.nanolett.4c01411

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(abstract)

Double-layer quantum systems are promising platforms for realizing novel quantum phases. Here, we report a study of quantum oscillations (QOs) in a weakly coupled double-layer system composed of a large-angle twisted-double-bilayer graphene (TDBG). We quantify the interlayer coupling strength by measuring the interlayer capacitance from the QOs pattern at low temperatures, revealing electron–hole asymmetry. At high temperatures when SdHOs are thermally smeared, we observe resistance peaks when Landau levels (LLs) from two moiré minivalleys are aligned, regardless of carrier density; eventually, it results in a 2-fold increase of oscillating frequency in D, serving as compelling evidence of the magneto-intersub-band oscillations (MISOs) in double-layer systems. The temperature dependence of MISOs suggests that electron–electron interactions play a crucial role and the scattering times obtained from MISO thermal damping are correlated with the interlayer coupling strength. Our study reveals intriguing interplays among Landau quantization, moiré band structure, and scatterings.

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Keyword: double-layer quantum system, magneto-intersub-band oscillations, interminivalley scatterings, interlayer capacitance, twisted-double-bilayer graphene

Date published: 2024-06-05

Publisher: American Chemical Society (ACS)

Journal:

  • Nano Letters (ISSN: 15306984) vol. 24 issue. 22 p. 6722-6729

Funding:

  • Ministry of Education, Culture, Sports, Science and Technology
  • National Key Research and Development Program of China 2020YFA0309600
  • National Key Research and Development Program of China 2021YFA1202900
  • Special Project for Research and Development in Key areas of Guangdong Province 2020B0101340001
  • Japan Society for the Promotion of Science 20H00354
  • Japan Society for the Promotion of Science 21H05233
  • Japan Society for the Promotion of Science 23H02052
  • Chinese Academy of Sciences XDB33000000
  • National Natural Science Foundation of China 12074413
  • National Natural Science Foundation of China 61888102

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1021/acs.nanolett.4c01411

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Updated at: 2025-08-02 08:30:24 +0900

Published on MDR: 2025-08-02 08:17:32 +0900

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