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Dirac Semimetal Heterostructures: 3D Cd 3 As 2 on 2D Graphene
Author(s) -
Wu YanFei,
Zhang Liang,
Li CaiZhen,
Zhang ZhenSheng,
Liu Song,
Liao ZhiMin,
Yu Dapeng
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201707547
Subject(s) - graphene , semimetal , materials science , spintronics , condensed matter physics , heterojunction , dirac (video compression format) , fermi level , topological insulator , van der waals force , nanotechnology , physics , quantum mechanics , ferromagnetism , electron , band gap , molecule , neutrino
Abstract Dirac semimetal is an emerging class of quantum matters, ranging from 2D category, such as, graphene and surface states of topological insulator to 3D category, for instance, Cd 3 As 2 and Na 3 Bi. As 3D Dirac semimetals typically possess Fermi‐arc surface states, the 2D–3D Dirac van der Waals heterostructures should be promising for future electronics. Here, graphene–Cd 3 As 2 heterostructures are fabricated through direct layer‐by‐layer stacking. The electronic coupling results in a notable interlayer charge transfer, which enables us to modulate the Fermi level of graphene through Cd 3 As 2 . A planar graphene p–n–p junction is achieved by selective modification, which demonstrates quantized conductance plateaus. Moreover, compared with the bare graphene device, the graphene–Cd 3 As 2 hybrid device presents large nonlocal signals near the Dirac point due to the charge transfer from the spin‐polarized surface states in the adjacent Cd 3 As 2 . The results enrich the family of van der Waals heterostructure and should inspire more studies on the application of Dirac/Weyl semimetals in spintronics.