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Mott and generalized Wigner crystal states in WSe2/WS2 moiré superlattices.
Regan, Emma C; Wang, Danqing; Jin, Chenhao; Bakti Utama, M Iqbal; Gao, Beini; Wei, Xin; Zhao, Sihan; Zhao, Wenyu; Zhang, Zuocheng; Yumigeta, Kentaro; Blei, Mark; Carlström, Johan D; Watanabe, Kenji; Taniguchi, Takashi; Tongay, Sefaattin; Crommie, Michael; Zettl, Alex; Wang, Feng.
Afiliação
  • Regan EC; Department of Physics, University of California at Berkeley, Berkeley, CA, USA.
  • Wang D; Graduate Group in Applied Science and Technology, University of California at Berkeley, Berkeley, CA, USA.
  • Jin C; Material Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.
  • Bakti Utama MI; Department of Physics, University of California at Berkeley, Berkeley, CA, USA.
  • Gao B; Graduate Group in Applied Science and Technology, University of California at Berkeley, Berkeley, CA, USA.
  • Wei X; Material Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.
  • Zhao S; Department of Physics, University of California at Berkeley, Berkeley, CA, USA.
  • Zhao W; Kavli Institute at Cornell for Nanoscale Science, Ithaca, NY, USA.
  • Zhang Z; Department of Physics, University of California at Berkeley, Berkeley, CA, USA.
  • Yumigeta K; Material Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.
  • Blei M; Department of Materials Science and Engineering, University of California at Berkeley, Berkeley, CA, USA.
  • Carlström JD; Department of Physics, University of California at Berkeley, Berkeley, CA, USA.
  • Watanabe K; Department of Physics, Huazhong University of Science and Technology, Wuhan, China.
  • Taniguchi T; Department of Physics, University of California at Berkeley, Berkeley, CA, USA.
  • Tongay S; School of Physics, University of the Chinese Academy of Sciences, Beijing, China.
  • Crommie M; Department of Physics, University of California at Berkeley, Berkeley, CA, USA.
  • Zettl A; Department of Physics, University of California at Berkeley, Berkeley, CA, USA.
  • Wang F; Department of Physics, University of California at Berkeley, Berkeley, CA, USA.
Nature ; 579(7799): 359-363, 2020 03.
Article em En | MEDLINE | ID: mdl-32188951
ABSTRACT
Moiré superlattices can be used to engineer strongly correlated electronic states in two-dimensional van der Waals heterostructures, as recently demonstrated in the correlated insulating and superconducting states observed in magic-angle twisted-bilayer graphene and ABC trilayer graphene/boron nitride moiré superlattices1-4. Transition metal dichalcogenide moiré heterostructures provide another model system for the study of correlated quantum phenomena5 because of their strong light-matter interactions and large spin-orbit coupling. However, experimental observation of correlated insulating states in this system is challenging with traditional transport techniques. Here we report the optical detection of strongly correlated phases in semiconducting WSe2/WS2 moiré superlattices. We use a sensitive optical detection technique and reveal a Mott insulator state at one hole per superlattice site and surprising insulating phases at 1/3 and 2/3 filling of the superlattice, which we assign to generalized Wigner crystallization on the underlying lattice6-11. Furthermore, the spin-valley optical selection rules12-14 of transition metal dichalcogenide heterostructures allow us to optically create and investigate low-energy excited spin states in the Mott insulator. We measure a very long spin relaxation lifetime of many microseconds in the Mott insulating state, orders of magnitude longer than that of charge excitations. Our studies highlight the value of using moiré superlattices beyond graphene to explore correlated physics.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Nature Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Estados Unidos
Texto completo
Adicionar na Minha BVS
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XML
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Nature Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Estados Unidos