The interplay of ferroelectricity and magneto-transport in non-magnetic moiré superlattices

Abstract

The coupling of ferroelectricity and magnetic order provides rich tunability for engineering material properties and demonstrates great potential for uncovering novel quantum phenomena and multifunctional devices. Here, we report interfacial ferroelectricity in moiré superlattices constructed from graphene and hexagonal boron nitride. We observe ferroelectric polarization in an across-layer moiré superlattice with an intercalated layer, demonstrating a remnant polarization comparable to its non-intercalated counterpart. Remarkably, we reveal a magnetic-field enhancement of ferroelectric polarization that persists up to room temperature, showcasing an unconventional amplification of ferroelectricity in materials lacking magnetic elements. This phenomenon, consistent across devices with varying layer configurations, arises purely from electronic rather than ionic contributions. Furthermore, the ferroelectric polarization in turn modulates quantum transport characteristics, suppressing Shubnikov-de Haas oscillations and altering quantum Hall states in polarized phases. This interplay between ferroelectricity and magneto-transport in non-magnetic materials is crucial for exploring magnetoelectric effects and advancing two-dimensional memory and logic applications.

References in corpus (25)

• 2D materials and van der Waals heterostructures
• Van der Waals density functionals applied to solids
• Hofstadter's butterfly in moire superlattices: A fractal quantum Hall effect
• Cloning of Dirac fermions in graphene superlattices
• Interfacial Ferroelectricity by van-der-Waals Sliding
• Decoupling superconductivity and correlated insulators in twisted bilayer graphene
• Superlattice-induced insulating states and valley-protected orbits in twisted bilayer graphene
• Edge chirality determination of graphene by Raman spectroscopy
• Atypical sliding and Moire ferroelectricity in pure multilayer graphene
• The importance of the electronic contribution to linear magnetoelectricity
• The Electronic Thickness of Graphene
• Across-Layer Sliding Ferroelectricity in Graphene-Based Heterolayers: Asymmetry of Next Neighbor Interlayer Couplings
• Electrical switching of a moiré ferroelectric superconductor
• Exchange striction induced giant ferroelectric polarization in copper based multiferroic material $\alpha$-Cu${}_2$V${}_2$O${}_7$
• Chiral transport along magnetic domain walls in the quantum anomalous Hall effect
• Visualizing moiré ferroelectricity via plasmons and nano-photocurrent in graphene/twisted-WSe2 structures
• Selective and Quasi-continuous Switching of Ferroelectric Chern Insulator Device for Neuromorphic Computing
• Mixed-Stacking Few-Layer Graphene as an Elemental Weak Ferroelectric Material
• Twist-angle tunable spin texture in WSe${}_2$/graphene van der Waals heterostructures
• Strong electronic interaction and multiple quantum Hall ferromagnetic phases in trilayer graphene
• Proximity spin-orbit and exchange coupling in ABA and ABC trilayer graphene van der Waals heterostructures
• Unveiling the origin of unconventional moire ferroelectricity
• Quantum capacitive coupling between large-angle twisted graphene layers
• Direct observation of chiral edge current at zero magnetic field in odd-layer MnBi${}_2$Te${}_4$
• Magnetic Field-Induced Polar Order in Monolayer Molybdenum Disulfide Transistors