Download file (1.73MB)
Download as zip (1.56MB)

コレクション

引用

説明:

Quantum oscillations provide a striking visualization of the Fermi surface of metals including associated geometrical phases, such as Berry’s phase, that play a central role in topological quantum materials. We report on magneto-transport measure- ments in ABA-trilayer graphene, the band structure of which is comprised of a weakly gapped monolayer graphene (MLG)-like band, nested within a trivial bilayer graphene (BLG)-like band. Detailed field and density maps, for a wide range of device param- eters, reveal Shubnikov-de Hass (SdH) oscillations of the BLG-like band shifted by a phase that sharply departs from the expected 2π Berry’s phase. A careful analysis reveals that, surprisingly, the anomalous shift is non-trivial and is inherited from the non-trivial Berry’s phase of the MLG-like band due to strong filling-enforced con- straints between the BLG-like and MLG-like Fermi surfaces. Given that many topo- logical materials contain multiple bands, our work indicates how additional bands, which are thought to obscure the analysis, can actually be exploited to tease out the subtle effects of Berry’s phase.

権利情報:

• Creative Commons BY-NC Attribution-NonCommercial 4.0 International
  

キーワード: Quantum oscillations, trilayer graphene, Berry's phase

刊行年月日: 2019-10-11

出版者: American Association for the Advancement of Science (AAAS)

掲載誌:

• Science Advances (ISSN: 23752548) vol. 5 issue. 10

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1126/sciadv.aax6550

関連資料:

その他の識別子:

連絡先:

更新時刻: 2025-02-23 22:51:10 +0900

MDRでの公開時刻: 2025-02-23 22:51:10 +0900