Moiré Flat Bands in Twisted Double Bilayer Graphene

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{
  "revision": 1, 
  "id": "383", 
  "created": "2020-05-12T13:53:59.671579+00:00", 
  "metadata": {
    "doi": "10.24435/materialscloud:2020.0047/v1", 
    "status": "published", 
    "title": "Moir\u00e9 Flat Bands in Twisted Double Bilayer Graphene", 
    "mcid": "2020.0047/v1", 
    "license_addendum": "", 
    "_files": [
      {
        "description": "WannierTools inputs files for the tight-binding  bandstructure calculations of the rigid and relaxed models of TDBG characterized by different twist angles in the presence of the intrinsic symmetric polarization.", 
        "key": "TDBG_TBISP.tar.gz", 
        "size": 598726225, 
        "checksum": "md5:4203914f703205f9c78d855c384b7efd"
      }, 
      {
        "description": "readme.txt containing detailed description of the dataset folder", 
        "key": "readme.txt", 
        "size": 1719, 
        "checksum": "md5:6be147077083c7f36e37ee31917f4e03"
      }
    ], 
    "owner": 19, 
    "_oai": {
      "id": "oai:materialscloud.org:383"
    }, 
    "keywords": [
      "MARVEL/DD6", 
      "EPFL", 
      "SNSF", 
      "Continuum model", 
      "Twisted double bilayer graphene", 
      "Tight-Binding model", 
      "WannierTools", 
      "Magic angle", 
      "Flat bands", 
      "Moir\u00e9 superlattice"
    ], 
    "conceptrecid": "382", 
    "is_last": true, 
    "references": [
      {
        "type": "Journal reference", 
        "doi": "10.1021/acs.nanolett.9b05117", 
        "url": "https://pubs.acs.org/doi/abs/10.1021/acs.nanolett.9b05117", 
        "comment": "", 
        "citation": "F. Haddadi, Q. Wu, A. J. Kruchkov, O. V. Yazyev, Nano Letters 20, 2410-2415 (2020)"
      }
    ], 
    "publication_date": "Apr 29, 2020, 00:00:00", 
    "license": "Creative Commons Attribution 4.0 International", 
    "id": "383", 
    "description": "We investigate twisted double bilayer graphene (TDBG), a four-layer system composed of two AB-stacked graphene bilayers rotated with respect to each other by a small angle. Our ab-initio band structure calculations reveal a considerable energy gap at the charge point neutrality that we assign to the intrinsic symmetric polarization (ISP). We then introduce the ISP effect into the tight-binding parameterization and perform calculations on TDBG models that include lattice relaxation effects down to very small twist angles. We identify a narrow region around the magic angle \u03b8*= 1.3\u00b0 characterized by a manifold of remarkably flat bands gapped out from other states even without external electric fields. To understand the fundamental origin of the magic angle in TDBG, we construct a continuum model that points to a hidden mathematical link to the twisted bilayer graphene (TBG) model, thus indicating that the band flattening is a fundamental feature of TDBG, and is not a result of external fields.", 
    "version": 1, 
    "contributors": [
      {
        "email": "fatemeh.haddadi@epfl.ch", 
        "affiliations": [
          "Institute of Physics, \u00c9cole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland"
        ], 
        "familyname": "Haddadi", 
        "givennames": "Fatemeh"
      }, 
      {
        "email": "quansheng.wu@epfl.ch", 
        "affiliations": [
          "Institute of Physics, \u00c9cole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland and National Centre for Computational Design and Discovery of Novel Materials (MARVEL), \u00c9cole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland"
        ], 
        "familyname": "Wu", 
        "givennames": "QuanSheng"
      }, 
      {
        "email": "akruchkov@g.harvard.edu", 
        "affiliations": [
          "Department of Physics, Harvard University, Cambridge, Massachusetts 02138, United States"
        ], 
        "familyname": "J. Kruchkov", 
        "givennames": "Alex"
      }, 
      {
        "email": "oleg.yazyev@epfl.ch", 
        "affiliations": [
          "Institute of Physics, \u00c9cole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland and National Centre for Computational Design and Discovery of Novel Materials (MARVEL), \u00c9cole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland"
        ], 
        "familyname": "V. Yazyev", 
        "givennames": "Oleg"
      }
    ], 
    "edited_by": 98
  }, 
  "updated": "2020-04-29T00:00:00+00:00"
}