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Article
Chemistry, Multidisciplinary
Vladimir V. Enaldiev et al.
Summary: This study proposes a network theory to explain the tunability of ferroelectric domain structures in two-dimensional semiconductors under the influence of an electric field. Through multiscale analysis, it is found that the properties of the domain wall network undergo a qualitative change at a specific displacement field threshold.
Article
Chemistry, Multidisciplinary
Yang Liu et al.
Summary: Robust ferroelectricity can be achieved in nonferroelectric semiconducting 2H-WSe2 by creating R-stacked bilayers with broken inversion symmetry. The phase transition order of this artificial ferroelectric heterostructure is first-order, with a measured Curie temperature of 353K. The stability of this artificial ferroelectric material is demonstrated through consecutive polarization measurements.
Article
Nanoscience & Nanotechnology
Pan He et al.
Summary: Graphene moire superlattices exhibit giant second-order nonlinear transports, both longitudinal and transverse, under zero magnetic field, originating from the skew scattering of chiral Bloch electrons. These findings provide an alternative means for inducing second-order transports in van der Waals heterostructures.
NATURE NANOTECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Xirui Wang et al.
Summary: By stacking non-equilibrium configurations of van der Waals materials, we have successfully fabricated nanometer-thick 2D ferroelectric semiconductors. We discovered electrically switchable rhombohedral-stacking configurations by parallel stacking two identical monolayer transition metal dichalcogenides (TMDs), with out-of-plane polarization that can be flipped by in-plane sliding motion. The ferroelectric domains were visualized using piezoelectric force microscopy.
NATURE NANOTECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Yanyu Jia et al.
Summary: Evidence suggests the existence of an intrinsic insulating state at the charge neutrality point in clean samples, confirming the correlated nature of this charge-neutral insulator. These observations lay the foundation for understanding a new class of correlated insulators with nontrivial topology and identify monolayer WTe2 as a promising candidate for exploring quantum phases of ground-state excitons.
Article
Nanoscience & Nanotechnology
Astrid Weston et al.
Summary: Marginal twisting of 2D semiconductor crystals enables the emergence of room temperature interfacial ferroelectricity. The ferroelectricity can be controlled and moved by applying an electric field, opening up unlimited possibilities for the design of new metamaterials.
NATURE NANOTECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Subhajit Sinha et al.
Summary: The topological aspects of the electron wave function, including the Berry curvature and Chern number, play a crucial role in determining the physical properties of materials. Twisted double bilayer graphene offers a tunable system to study topological transitions and has potential applications in next-generation Berry-curvature-based memory devices. Furthermore, the strain-induced Berry curvature dipole can be used to detect topological transitions in the bands.
Article
Nanoscience & Nanotechnology
Zi-Si Chen et al.
Summary: The electronic structures of non-twisted and twisted WTe2/WSe2 heterojunction bilayers were investigated using first-principles calculations. It was found that the twisted bilayers exhibit direct and indirect bandgaps, and the bandgap size is strongly dependent on the twist angle.
Review
Nanoscience & Nanotechnology
Kin Fai Mak et al.
Summary: This article elaborates on the recent developments and future opportunities and challenges in fundamental research on semiconductor moire materials, with a particular focus on transition metal dichalcogenides.
NATURE NANOTECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Cheng-Ping Zhang et al.
Summary: Recent studies have shown that moiré flat bands in twisted bilayer graphene (TBG) can exhibit nontrivial Berry curvatures when aligned with a hexagonal boron nitride substrate, resulting in a correlated Chern insulator near the 3/4 filling. This letter demonstrates that the large Berry curvatures in the moiré bands can induce a strong nonlinear Hall (NLH) effect in strained TBG. The giant NLH effect appears generically for a twist angle near the magic angle due to the strong susceptibility of nearly flat moiré bands to symmetry breaking induced by strains.
Article
Multidisciplinary Sciences
Pengjie Wang et al.
Summary: Experimental observation of Landau quantization in a two-dimensional insulator, WTe2, suggests the possible existence of fractionalized, charge-neutral fermions. Large quantum oscillations were found in the material's magnetoresistance using a detection scheme that avoids edge contributions.
Review
Chemistry, Multidisciplinary
Lu Qi et al.
Summary: 2D ferroelectrics are predicted to be important functional materials in the upcoming nano era, with unique properties such as photovoltaic, piezoelectric, and pyroelectric effects, as well as valley and spin polarization. Research focuses on exploring theories, experiments, and applications for these materials.
ADVANCED MATERIALS
(2021)
Article
Physics, Multidisciplinary
Jiacheng Zhu et al.
Summary: This study demonstrates a mechanism for magnetoresistance oscillations in insulating states of 2D materials, showing that the oscillations are correlated with the high-density Fermi surface and due to the oscillatory behavior of graphite density of states. This unified mechanism for quantum oscillations in graphite-gated 2D insulators is based on electrostatic sample-gate coupling.
PHYSICAL REVIEW LETTERS
(2021)
Review
Physics, Multidisciplinary
Dante M. Kennes et al.
Summary: Twisted van der Waals heterostructures have attracted attention as a robust quantum simulation platform for studying strongly correlated physics and topology in quantum materials. Their versatility, feasibility to realize many-body quantum models, and availability of experimental readout protocols open up new possibilities in accessible physics and hold promise for future technological applications.
Editorial Material
Nanoscience & Nanotechnology
Eva Y. Andrei et al.
Summary: Moire systems formed by 2D atomic layers have versatile electrical and optical properties, hosting exotic phenomena like superconductivity, correlated insulator states, and orbital magnetism. In this Viewpoint, researchers studying various aspects of moire materials discuss the most exciting directions in this rapidly expanding field.
NATURE REVIEWS MATERIALS
(2021)
Article
Physics, Applied
Yuan Xie et al.
Summary: In this study, a gate-tunable MoTe2/WTe2 heterostructure was developed, which exhibited a reversible and widely tunable rectification ratio and a tunable self-excited photocurrent. The MoTe2/WTe2 heterostructure also showed excellent photo-response, enabling its usage in multifunctional devices for photovoltaic and logic applications.
APPLIED PHYSICS LETTERS
(2021)
Article
Multidisciplinary Sciences
Yu Saito et al.
Summary: The study explores the finite-temperature dynamics of spin and valley isospins in magic-angle twisted bilayer graphene, revealing a resistivity peak at high temperatures near a superlattice filling factor of -1, suggesting a Pomeranchuk-type mechanism. The data indicate the presence of a finite-field magnetic phase transition and a small isospin stiffness in the system.
Article
Multidisciplinary Sciences
Kenji Yasuda et al.
Summary: In this research, ferroelectricity is achieved in two-dimensional boron nitride through van der Waals assembly, demonstrating the phenomenon that polarization can be changed by twisting the angle. This discovery paves the way for potential applications in ultrathin nonvolatile memory, while maintaining the high mobility of graphene.
Article
Multidisciplinary Sciences
M. Vizner Stern et al.
Summary: In this study, a stable ferroelectric order was discovered at the interface between two naturally grown flakes of hexagonal boron nitride, where the flakes were stacked in a non-centrosymmetric parallel orientation. Reversible polarization switching coupled with lateral sliding was achieved by scanning a biased tip above the surface.
Article
Multidisciplinary Sciences
Fabio Ferreira et al.
Summary: Research shows that charge transfer between layers in bilayers of two-dimensional semiconductors can generate a potential difference, with the stacking arrangement of different materials affecting the amount of charge transfer. This information can be used to map the potential generated by interlayer charge transfer in twisted bilayers.
SCIENTIFIC REPORTS
(2021)
Review
Physics, Applied
Z. Z. Du et al.
Summary: The recent discovery of the nonlinear Hall effect adds a new perspective to probing the spectral, symmetry, and topological properties of quantum materials. This effect, characterized by transverse Hall voltage in response to two longitudinal currents, does not require the breaking of time-reversal symmetry. It holds deep connections to symmetry and topology, offering new avenues for exploration in emergent quantum materials and phases of matter.
NATURE REVIEWS PHYSICS
(2021)
Article
Multidisciplinary Sciences
Yanhao Tang et al.
Article
Physics, Multidisciplinary
Leon Balents et al.
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Multidisciplinary Sciences
Zhiren Zheng et al.
Review
Chemistry, Physical
Eva Y. Andrei et al.
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Chemistry, Physical
Kaifei Kang et al.
Article
Multidisciplinary Sciences
Pankaj Sharma et al.
Article
Multidisciplinary Sciences
Qiong Ma et al.
Article
Chemistry, Physical
Hua Wang et al.
NPJ COMPUTATIONAL MATERIALS
(2019)
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Su-Yang Xu et al.
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Multidisciplinary Sciences
Sanfeng Wu et al.
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Multidisciplinary Sciences
Zaiyao Fei et al.
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Qing Yang et al.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2018)
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Zaiyao Fei et al.
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Lei Li et al.
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Kai Chang et al.
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Fucai Liu et al.
NATURE COMMUNICATIONS
(2016)
Article
Multidisciplinary Sciences
Hideaki Sakai et al.
Article
Multidisciplinary Sciences
Yuanyue Liu et al.
Article
Physics, Multidisciplinary
H. Y. Lv et al.
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Physics, Multidisciplinary
Inti Sodemann et al.
PHYSICAL REVIEW LETTERS
(2015)
Article
Multidisciplinary Sciences
Xiaofeng Qian et al.
Article
Multidisciplinary Sciences
L. Wang et al.
Article
Physics, Multidisciplinary
Di Xiao et al.
REVIEWS OF MODERN PHYSICS
(2010)
Article
Physics, Multidisciplinary
AA Burkov et al.
PHYSICAL REVIEW LETTERS
(2003)
