Visualizing the Anomalous Charge Density Wave States in Graphene/NbSe(2)Heterostructures
Y. Chen; L. S. Wu; H. Xu; C. X. Cong; S. Li; S. Feng; H. B. Zhang; C. J. Zou; J. Z. Shang; S. Y. A. Yang; K. P. Loh; W. Huang and T. Yu
Source PublicationAdvanced Materials
AbstractMetallic layered transition metal dichalcogenides (TMDs) host collective many-body interactions, including the competing superconducting and charge density wave (CDW) states. Graphene is widely employed as a heteroepitaxial substrate for the growth of TMD layers and as an ohmic contact, where the graphene/TMD heterostructure is naturally formed. The presence of graphene can unpredictably influence the CDW order in 2D CDW conductors. This work reports the CDW transitions of 2H-NbSe(2)layers in graphene/NbSe(2)heterostructures. The evolution of Raman spectra demonstrates that the CDW phase transition temperatures (T-CDW) of NbSe(2)are dramatically decreased when capped by graphene. The induced anomalous short-range CDW state is confirmed by scanning tunneling microscopy measurements. The findings propose a new criterion to determine theT(CDW)through monitoring the line shape of the A(1g)mode. Meanwhile, the 2D band is also discovered as an indicator to observe the CDW transitions. First-principles calculations imply that interfacial electron doping suppresses the CDW states by impeding the lattice distortion of 2H-NbSe2. The extraordinary random CDW lattice suggests deep insight into the formation mechanism of many collective electronic states and possesses great potential in modulating multifunctional devices.
Indexed BySCI ; EI
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GB/T 7714
Y. Chen,L. S. Wu,H. Xu,et al. Visualizing the Anomalous Charge Density Wave States in Graphene/NbSe(2)Heterostructures[J]. Advanced Materials,2020,32(45):7.
APA Y. Chen.,L. S. Wu.,H. Xu.,C. X. Cong.,S. Li.,...&W. Huang and T. Yu.(2020).Visualizing the Anomalous Charge Density Wave States in Graphene/NbSe(2)Heterostructures.Advanced Materials,32(45),7.
MLA Y. Chen,et al."Visualizing the Anomalous Charge Density Wave States in Graphene/NbSe(2)Heterostructures".Advanced Materials 32.45(2020):7.
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