Visualizing moiré ferroelectricity via plasmons and nano-photocurrent in graphene/twisted-WSe2 structures

Abstract

Ferroelectricity, a spontaneous and reversible electric polarization, is found in certain classes of van der Waals (vdW) material heterostructures. The discovery of ferroelectricity in twisted vdW layers provides new opportunities to engineer spatially dependent electric and optical properties associated with the configuration of moiré superlattice domains and the network of domain walls. Here, we employ near-field infrared nano-imaging and nano-photocurrent measurements to study ferroelectricity in minimally twisted WSe2. The ferroelectric domains are visualized through the imaging of the plasmonic response in a graphene monolayer adjacent to the moiré WSe2 bilayers. Specifically, we find that the ferroelectric polarization in moiré domains is imprinted on the plasmonic response of the graphene. Complementary nano-photocurrent measurements demonstrate that the optoelectronic properties of graphene are also modulated by the proximal ferroelectric domains. Our approach represents an alternative strategy for studying moiré ferroelectricity at native length scales and opens promising prospects for (opto)electronic devices.

19 pages, 3 figures

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• Sliding induced multiple polarization states in two-dimensional ferroelectrics
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• Multifaceted moiré superlattice physics in twisted WSe${}_2$ bilayers
• Piezoelectric networks and ferroelectric moiré superlattice domains in twistronic WS${}_2$/MoS${}_2$ and WSe${}_2$/MoSe${}_2$ bilayers
• Hyperbolic enhancement of photocurrent patterns in minimally twisted bilayer graphene
• Nano-photocurrent mapping of local electronic structure in twisted bilayer graphene
• Optically probing the asymmetric interlayer coupling in rhombohedral-stacked MoS2 bilayer
• Ferroelectric switching at symmetry-broken interfaces by local control of dislocation networks

Cited by in corpus (17)

• Roadmap for Photonics with 2D Materials
• Excitonic signatures of ferroelectric order in parallel-stacked MoS${}_2$
• Polarization Saturation in Multi-layered Interfacial Ferroelectrics
• Engineering band structures of two-dimensional materials with remote moire ferroelectricity
• Visualizing the microscopic origins of topology in twisted molybdenum ditelluride
• Polaritonic Quantum Matter
• Twist-angle evolution of the intervalley-coherent antiferromagnet in twisted WSe${}_2$
• Emergent inhomogeneity and non-locality in a graphene field-effect transistor on a near-parallel moire superlattice of transition metal dichalcogenides
• Plasmonic polarization sensing of electrostatic superlattice potentials
• Photoluminescence Detection of Polytype Polarization in r-MoS2 Enabled by Asymmetric Dielectric Environments
• The interplay of ferroelectricity and magneto-transport in non-magnetic moiré superlattices
• Shift photocurrent vortices from topological polarization textures
• Review of the tight-binding method applicable to the properties of moiré superlattices
• IRSSG: An Open-Source Software Package for Spin Space Groups
• Electrically driven plasmon-polaritonic bistability in Dirac electron tunneling transistors
• Large symmetry and hierarchical ordering transitions in sliding ferroelectrics
• Manipulating Charge Distribution in Moiré Superlattices by Light