IDEAS home Printed from https://ideas.repec.org/a/nat/nature/v590y2021i7845d10.1038_s41586-021-03192-0.html
   My bibliography  Save this article

Tunable strongly coupled superconductivity in magic-angle twisted trilayer graphene

Author

Listed:
  • Jeong Min Park

    (Massachusetts Institute of Technology)

  • Yuan Cao

    (Massachusetts Institute of Technology)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Pablo Jarillo-Herrero

    (Massachusetts Institute of Technology)

Abstract

Moiré superlattices1,2 have recently emerged as a platform upon which correlated physics and superconductivity can be studied with unprecedented tunability3–6. Although correlated effects have been observed in several other moiré systems7–17, magic-angle twisted bilayer graphene remains the only one in which robust superconductivity has been reproducibly measured4–6. Here we realize a moiré superconductor in magic-angle twisted trilayer graphene (MATTG)18, which has better tunability of its electronic structure and superconducting properties than magic-angle twisted bilayer graphene. Measurements of the Hall effect and quantum oscillations as a function of density and electric field enable us to determine the tunable phase boundaries of the system in the normal metallic state. Zero-magnetic-field resistivity measurements reveal that the existence of superconductivity is intimately connected to the broken-symmetry phase that emerges from two carriers per moiré unit cell. We find that the superconducting phase is suppressed and bounded at the Van Hove singularities that partially surround the broken-symmetry phase, which is difficult to reconcile with weak-coupling Bardeen–Cooper–Schrieffer theory. Moreover, the extensive in situ tunability of our system allows us to reach the ultrastrong-coupling regime, characterized by a Ginzburg–Landau coherence length that reaches the average inter-particle distance, and very large TBKT/TF values, in excess of 0.1 (where TBKT and TF are the Berezinskii–Kosterlitz–Thouless transition and Fermi temperatures, respectively). These observations suggest that MATTG can be electrically tuned close to the crossover to a two-dimensional Bose–Einstein condensate. Our results establish a family of tunable moiré superconductors that have the potential to revolutionize our fundamental understanding of and the applications for strongly coupled superconductivity.

Suggested Citation

  • Jeong Min Park & Yuan Cao & Kenji Watanabe & Takashi Taniguchi & Pablo Jarillo-Herrero, 2021. "Tunable strongly coupled superconductivity in magic-angle twisted trilayer graphene," Nature, Nature, vol. 590(7845), pages 249-255, February.
  • Handle: RePEc:nat:nature:v:590:y:2021:i:7845:d:10.1038_s41586-021-03192-0
    DOI: 10.1038/s41586-021-03192-0
    as

    Download full text from publisher

    File URL: https://www.nature.com/articles/s41586-021-03192-0
    File Function: Abstract
    Download Restriction: Access to the full text of the articles in this series is restricted.

    File URL: https://libkey.io/10.1038/s41586-021-03192-0?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    As the access to this document is restricted, you may want to search for a different version of it.

    Citations

    Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.
    as


    Cited by:

    1. Yu-Bo Liu & Jing Zhou & Congjun Wu & Fan Yang, 2023. "Charge-4e superconductivity and chiral metal in 45°-twisted bilayer cuprates and related bilayers," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    2. Wenbin Wu & Zeping Shi & Mykhaylo Ozerov & Yuhan Du & Yuxiang Wang & Xiao-Sheng Ni & Xianghao Meng & Xiangyu Jiang & Guangyi Wang & Congming Hao & Xinyi Wang & Pengcheng Zhang & Chunhui Pan & Haifeng , 2024. "The discovery of three-dimensional Van Hove singularity," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    3. Yifan Xie & Shuo Feng & Linxiao Deng & Aoran Cai & Liyu Gan & Zifan Jiang & Peng Yang & Guilin Ye & Zaiqing Liu & Li Wen & Qing Zhu & Wanjun Zhang & Zhanpeng Zhang & Jiahe Li & Zeyu Feng & Chutian Zha, 2023. "Inverse design of chiral functional films by a robotic AI-guided system," Nature Communications, Nature, vol. 14(1), pages 1-13, December.
    4. Changjiang Liu & Xianjing Zhou & Deshun Hong & Brandon Fisher & Hong Zheng & John Pearson & Jidong Samuel Jiang & Dafei Jin & Michael R. Norman & Anand Bhattacharya, 2023. "Tunable superconductivity and its origin at KTaO3 interfaces," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    5. Le Liu & Shihao Zhang & Yanbang Chu & Cheng Shen & Yuan Huang & Yalong Yuan & Jinpeng Tian & Jian Tang & Yiru Ji & Rong Yang & Kenji Watanabe & Takashi Taniguchi & Dongxia Shi & Jianpeng Liu & Wei Yan, 2022. "Isospin competitions and valley polarized correlated insulators in twisted double bilayer graphene," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    6. Maine Christos & Subir Sachdev & Mathias S. Scheurer, 2023. "Nodal band-off-diagonal superconductivity in twisted graphene superlattices," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
    7. J. González & T. Stauber, 2023. "Ising superconductivity induced from spin-selective valley symmetry breaking in twisted trilayer graphene," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    8. Dorri Halbertal & Simon Turkel & Christopher J. Ciccarino & Jonas B. Profe & Nathan Finney & Valerie Hsieh & Kenji Watanabe & Takashi Taniguchi & James Hone & Cory Dean & Prineha Narang & Abhay N. Pas, 2022. "Unconventional non-local relaxation dynamics in a twisted trilayer graphene moiré superlattice," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    9. Jesse C. Hoke & Yifan Li & Julian May-Mann & Kenji Watanabe & Takashi Taniguchi & Barry Bradlyn & Taylor L. Hughes & Benjamin E. Feldman, 2024. "Uncovering the spin ordering in magic-angle graphene via edge state equilibration," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    10. Hualiang Lv & Yuxing Yao & Shucong Li & Guanglei Wu & Biao Zhao & Xiaodi Zhou & Robert L. Dupont & Ufuoma I. Kara & Yimin Zhou & Shibo Xi & Bo Liu & Renchao Che & Jincang Zhang & Hongbin Xu & Solomon , 2023. "Staggered circular nanoporous graphene converts electromagnetic waves into electricity," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    11. Bin Hu & Hui Chen & Yuhan Ye & Zihao Huang & Xianghe Han & Zhen Zhao & Hongqin Xiao & Xiao Lin & Haitao Yang & Ziqiang Wang & Hong-Jun Gao, 2024. "Evidence of a distinct collective mode in Kagome superconductors," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    12. Max Heyl & Kyosuke Adachi & Yuki M. Itahashi & Yuji Nakagawa & Yuichi Kasahara & Emil J. W. List-Kratochvil & Yusuke Kato & Yoshihiro Iwasa, 2022. "Vortex dynamics in the two-dimensional BCS-BEC crossover," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    13. Shubhayu Chatterjee & Taige Wang & Erez Berg & Michael P. Zaletel, 2022. "Inter-valley coherent order and isospin fluctuation mediated superconductivity in rhombohedral trilayer graphene," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    14. Hulin Yao & Pengcheng Zheng & Shibin Zhang & Chuanjie Hu & Xiaoli Fang & Liping Zhang & Dan Ling & Huanyang Chen & Xin Ou, 2024. "Twist piezoelectricity: giant electromechanical coupling in magic-angle twisted bilayer LiNbO3," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    15. Benjamin Lowe & Bernard Field & Jack Hellerstedt & Julian Ceddia & Henry L. Nourse & Ben J. Powell & Nikhil V. Medhekar & Agustin Schiffrin, 2024. "Local gate control of Mott metal-insulator transition in a 2D metal-organic framework," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

    More about this item

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:nat:nature:v:590:y:2021:i:7845:d:10.1038_s41586-021-03192-0. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Sonal Shukla or Springer Nature Abstracting and Indexing (email available below). General contact details of provider: http://www.nature.com .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.