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説明:

Quantum oscillations in magnetization or resistivity are a defining feature of metals subject to an external magnetic field. The phenomenon is generally not expected in insulators without a Fermi surface. The observations of quantum oscillations in Kondo insulating materials1-5 have provided a rare counterexample and attracted much theoretical interest6-12. However, the magnetic oscillations in correlated insulators remain poorly understood. Here we report the observations of resistivity quantum oscillations in an excitonic insulator realized in Coulomb-coupled electron- hole double layers13-21 with gate-tunability that allows the phenomenon to be explored in a more controllable fashion than in bulk materials. When the cyclotron energy of the electrons or holes is tuned to be comparable to or larger than the exciton binding energy, recurring transitions between excitonic insulators and electron-hole decoupled quantum Hall states are observed. Compressibility measurements show an oscillatory exciton binding energy as a function of magnetic field and electron-hole pair density. Coulomb drag measurements further reveal the formation of excitons with finite angular momentum. Our results are qualitatively captured by mean-field theory calculations22,23. The study demonstrates a new platform for studying quantum oscillations in correlated insulators.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: quantum oscillations
, excitonic insulator, electron-hole double layers

刊行年月日: 2025-08-25

出版者: Springer Science and Business Media LLC

掲載誌:

• Nature Materials (ISSN: 14764660) vol. 25 p. 42-48

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s41563-025-02334-3

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更新時刻: 2026-05-18 09:28:12 +0900

MDRでの公開時刻: 2026-05-18 12:23:07 +0900