Mott and generalized Wigner crystal states in WSe2/WS2 moiré superlattices View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2020-03-18

AUTHORS

Emma C. Regan, Danqing Wang, Chenhao Jin, M. Iqbal Bakti Utama, Beini Gao, Xin Wei, Sihan Zhao, Wenyu Zhao, Zuocheng Zhang, Kentaro Yumigeta, Mark Blei, Johan D. Carlström, Kenji Watanabe, Takashi Taniguchi, Sefaattin Tongay, Michael Crommie, Alex Zettl, Feng Wang

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. More... »

PAGES

359-363

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41586-020-2092-4

DOI

http://dx.doi.org/10.1038/s41586-020-2092-4

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1125714495

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/32188951


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16 schema:description 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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23 Mott insulator
24 Mott insulator state
25 WSe2/WS2 moiré superlattices
26 Waals heterostructures
27 Wigner crystal state
28 Wigner crystallization
29 charge excitations
30 correlated insulating
31 correlated physics
32 coupling
33 crystal state
34 crystallization
35 detection
36 detection techniques
37 electronic states
38 excitation
39 excited spin states
40 experimental observations
41 filling
42 graphene
43 heterostructures
44 holes
45 insulating
46 insulating phase
47 insulating state
48 insulator
49 insulator state
50 interaction
51 large spin-orbit coupling
52 lifetime
53 light-matter interaction
54 magnitude
55 microseconds
56 model system
57 moiré heterostructures
58 moiré superlattices
59 observations
60 optical detection
61 optical detection techniques
62 order
63 orders of magnitude
64 phase
65 physics
66 relaxation lifetime
67 sensitive optical detection technique
68 sites
69 spin relaxation lifetime
70 spin states
71 spin-orbit coupling
72 state
73 strong light-matter interaction
74 study
75 superconducting states
76 superlattice site
77 superlattices
78 system
79 technique
80 transition metal dichalcogenide heterostructures
81 transport technique
82 twisted-bilayer graphene
83 two-dimensional van der Waals heterostructures
84 values
85 van der Waals heterostructures
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