Correlated states in twisted double bilayer graphene


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{
  "id": "667", 
  "metadata": {
    "title": "Correlated states in twisted double bilayer graphene", 
    "doi": "10.24435/materialscloud:be-eq", 
    "license": "Creative Commons Attribution 4.0 International", 
    "keywords": [
      "twisted double bilayer graphene", 
      "TDBG", 
      "correlated states", 
      "MARVEL", 
      "CSCS", 
      "EPFL"
    ], 
    "contributors": [
      {
        "affiliations": [
          "Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China", 
          "School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China"
        ], 
        "familyname": "Shen", 
        "givennames": "Cheng"
      }, 
      {
        "affiliations": [
          "Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China", 
          "School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China"
        ], 
        "familyname": "Chu", 
        "givennames": "Yanbang"
      }, 
      {
        "affiliations": [
          "Institute of Physics, Ecole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), Lausanne, Switzerland", 
          "National Centre for Computational Design and Discovery of Novel Materials (MARVEL), Ecole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), Lausanne, Switzerland"
        ], 
        "familyname": "Wu", 
        "email": "quansheng.wu@epfl.ch", 
        "givennames": "QuanSheng"
      }, 
      {
        "affiliations": [
          "Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China", 
          "School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China"
        ], 
        "familyname": "Li", 
        "givennames": "Na"
      }, 
      {
        "affiliations": [
          "Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China", 
          "Songshan Lake Materials Laboratory, Dongguan, Guangdong, China"
        ], 
        "familyname": "Wang", 
        "givennames": "Shuopei"
      }, 
      {
        "affiliations": [
          "Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China", 
          "School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China"
        ], 
        "familyname": "Zhao", 
        "givennames": "Yanchong"
      }, 
      {
        "affiliations": [
          "Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China", 
          "School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China"
        ], 
        "familyname": "Tang", 
        "givennames": "Jian"
      }, 
      {
        "affiliations": [
          "Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China", 
          "School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China"
        ], 
        "familyname": "Liu", 
        "givennames": "Jieying"
      }, 
      {
        "affiliations": [
          "Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China", 
          "School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China"
        ], 
        "familyname": "Tian", 
        "givennames": "Jinpeng"
      }, 
      {
        "affiliations": [
          "National Institute for Materials Science, 1-1 Namiki, Tsukuba, Japan"
        ], 
        "familyname": "Watanabe", 
        "givennames": "Kenji"
      }, 
      {
        "affiliations": [
          "National Institute for Materials Science, 1-1 Namiki, Tsukuba, Japan"
        ], 
        "familyname": "Taniguchi", 
        "givennames": "Takashi"
      }, 
      {
        "affiliations": [
          "Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China", 
          "Beijing Key Laboratory for Nanomaterials and Nanodevices, Beijing, China", 
          "Songshan Lake Materials Laboratory, Dongguan, Guangdong, China"
        ], 
        "familyname": "Yang", 
        "givennames": "Rong"
      }, 
      {
        "affiliations": [
          "Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China", 
          "HKU-UCAS Joint Institute of Theoretical and Computational Physics, Department of Physics, The University of Hong Kong, Hong Kong, China", 
          "Songshan Lake Materials Laboratory, Dongguan, Guangdong, China"
        ], 
        "familyname": "Meng", 
        "givennames": "Zi Yang"
      }, 
      {
        "affiliations": [
          "Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China", 
          "School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China", 
          "Beijing Key Laboratory for Nanomaterials and Nanodevices, Beijing, China"
        ], 
        "familyname": "Shi", 
        "givennames": "Dongxia"
      }, 
      {
        "affiliations": [
          "Institute of Physics, Ecole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), Lausanne, Switzerland", 
          "National Centre for Computational Design and Discovery of Novel Materials (MARVEL), Ecole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), Lausanne, Switzerland"
        ], 
        "familyname": "Yazyev", 
        "email": "oleg.yazyev@epfl.ch", 
        "givennames": "Oleg V."
      }, 
      {
        "affiliations": [
          "Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China", 
          "School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China", 
          "Songshan Lake Materials Laboratory, Dongguan, Guangdong, China", 
          "Beijing Key Laboratory for Nanomaterials and Nanodevices, Beijing, China"
        ], 
        "familyname": "Zhang", 
        "email": "gyzhang@iphy.ac.cn", 
        "givennames": "Guangyu"
      }
    ], 
    "_files": [
      {
        "description": "Input files for WannierTools necessary to reproduce the band structure plots in the reference.", 
        "checksum": "md5:1394164cb9a2a900c011fc0cd89443f8", 
        "size": 17067772, 
        "key": "TDBG_1.3degree_archive.tar.gz"
      }, 
      {
        "description": "README file", 
        "checksum": "md5:f84aa10fd91a58f744a3667cb5368bf6", 
        "size": 1016, 
        "key": "README.txt"
      }
    ], 
    "references": [
      {
        "type": "Journal reference", 
        "doi": "10.1038/s41567-020-0825-9", 
        "citation": "C. Shen, Y. Chu, Q.-S. Wu, N. Li, S. Wang, Y. Zhao, J. Tang, J. Liu, J. Tian, K. Watanabe, T. Taniguchi, R. Yang, Z. Y. Meng, D. Shi, O. V. Yazyev, G. Zhang, Nature Physics, 16, 520\u2013525 (2020)", 
        "comment": "Paper in which the data is discussed.", 
        "url": "https://www.nature.com/articles/s41567-020-0825-9"
      }, 
      {
        "type": "Preprint", 
        "citation": "C. Shen, Y. Chu, Q.-S. Wu, N. Li, S. Wang, Y. Zhao, J. Tang, J. Liu, J. Tian, K. Watanabe, T. Taniguchi, R. Yang, Z. Y. Meng, D. Shi, O. V. Yazyev, G. Zhang, arXiv:1903.06952", 
        "comment": "Preprint where the data is discussed", 
        "url": "https://arxiv.org/abs/1903.06952"
      }
    ], 
    "conceptrecid": "666", 
    "version": 1, 
    "edited_by": 100, 
    "id": "667", 
    "owner": 65, 
    "mcid": "2021.4", 
    "is_last": true, 
    "status": "published", 
    "description": "Electron\u2013electron interactions play an important role in graphene and related systems and can induce exotic quantum states, especially in a stacked bilayer with a small twist angle. For bilayer graphene where the two layers are twisted by the \u2018magic angle\u2019, flat band and strong many-body effects lead to correlated insulating states and superconductivity. In contrast to monolayer graphene, the band structure of untwisted bilayer graphene can be further tuned by a displacement field, providing an extra degree of freedom to control the flat band that should appear when two bilayers are stacked on top of each other. Here, we report the discovery and characterization of displacement field-tunable electronic phases in twisted double bilayer graphene. We observe insulating states at a half-filled conduction band in an intermediate range of displacement fields. Furthermore, the resistance gap in the correlated insulator increases with respect to the in-plane magnetic fields and we find that the g factor, according to the spin Zeeman effect, is ~2, indicating spin polarization at half-filling. These results establish twisted double bilayer graphene as an easily tunable platform for exploring quantum many-body states.", 
    "license_addendum": null, 
    "_oai": {
      "id": "oai:materialscloud.org:667"
    }, 
    "publication_date": "Jan 09, 2021, 19:28:19"
  }, 
  "revision": 15, 
  "updated": "2021-01-09T18:28:20.045836+00:00", 
  "created": "2020-12-02T11:42:45.498358+00:00"
}