Tuning Quantum Phase Transitions at Half Filling in 3L-MoTe2/WSe2 Moire Superlattices

Review Nanoscience & Nanotechnology

Semiconductor moire materials

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)

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Article Physics, Multidisciplinary

Dynamical Mean-Field Theory of Moire? Bilayer Transition Metal Dichalcogenides: Phase Diagram, Resistivity, and Quantum Criticality

Jiawei Zang et al.

Summary: In this study, a comprehensive analysis of the triangular lattice moire??Hubbard model was conducted to investigate the physics of moire?? bilayer transition metal dichalcogenides. The results reveal the correlation between the band structure and important properties such as resistivity, magnetic order, and metal-insulator transition. The findings provide insights into the behavior of correlated states in twisted homobilayer WSe2 and heterobilayer MoTe2/WSe2 experiments.

PHYSICAL REVIEW X (2022)

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Article Physics, Multidisciplinary

Interaction-Driven Metal-Insulator Transition with Charge Fractionalization

Yichen Xu et al.

Summary: This article explores an extended version of the Hubbard model based on transition metal dichalcogenide (TMD) moire heterostructures, proposing a theory for a potentially continuous metal-insulator transition (MIT) with charge fractionalization. The paper also discusses the physics in phases near the MIT.

PHYSICAL REVIEW X (2022)

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Article Materials Science, Multidisciplinary

Gate-tunable heavy fermion quantum criticality in a moire Kondo lattice

Ajesh Kumar et al.

Summary: This study proposes the realization of Kondo lattice physics in moire superlattices at the interface between a WX2 homobilayer and MoX2 monolayer. It identifies a range of twist angles supporting a gate-tuned quantum phase transition and describes experimental signatures to distinguish among competing theoretical scenarios.

PHYSICAL REVIEW B (2022)

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Article Materials Science, Multidisciplinary

Doped Mott insulators in the triangular-lattice Hubbard model

Zheng Zhu et al.

Summary: We investigate the evolution of Mott insulators in the triangular lattice Hubbard Model for different hole dopings in both strong and intermediate coupling limits. We find that at intermediate coupling, an unusual metallic state emerges with short ranged spin correlations but long ranged spin-chirality order. On the other hand, at strong coupling, the 120 degree magnetic order of the insulating magnet persists and produces hole pockets with a well-defined Fermi surface.

PHYSICAL REVIEW B (2022)

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Article Materials Science, Multidisciplinary

Disorder-induced two-dimensional metal-insulator transition in moire transition metal dichalcogenide multilayers

Seongjin Ahn et al.

Summary: We developed a minimal theory for the metal-insulator transition observed in two-dimensional moire multilayer transition metal dichalcogenides, attributing it to Coulomb disorder in the environment. Carrier scattering by random charged impurities leads to an effective 2D MIT roughly controlled by the Ioffe-Regel criterion, with necessary random charged impurity content consistent with known levels in TMDs.

PHYSICAL REVIEW B (2022)

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Article Materials Science, Multidisciplinary

Interaction range and temperature dependence of symmetry breaking in strongly correlated two-dimensional moire transition metal dichalcogenide bilayers

Haining Pan et al.

Summary: This study theoretically investigates the strong correlation and symmetry breaking behaviors in two-dimensional moire transition metal dichalcogenide bilayers. The dependence of symmetry breaking on the range of electron-electron interaction and temperature is examined, with implications for experimental control and thermal suppression.

PHYSICAL REVIEW B (2022)

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Article Materials Science, Multidisciplinary

Proximity-driven ferromagnetism and superconductivity in the triangular Rashba-Hubbard model

Mehdi Biderang et al.

Summary: Researchers investigate the superconducting pairings for TMDs in bilayer moire structures deposited on a substrate. They find that Rashba spin-orbit coupling enhances triplet superconductivity, and the absence of spatial inversion symmetry and time-reversal symmetry can lead to mixed singlet and triplet channels of superconductivity.

PHYSICAL REVIEW B (2022)

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Article Multidisciplinary Sciences

Imaging two-dimensional generalized Wigner crystals

Hongyuan Li et al.

Summary: The Wigner crystal has been a subject of fascination for condensed matter physicists for nearly 90 years and has recently been observed in moire superlattices. This study successfully demonstrates real-space imaging of 2D Wigner crystals in WSe2/WS2 heterostructures using a specially designed non-invasive STM spectroscopy technique.

NATURE (2021)

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Article Multidisciplinary Sciences

Quantum anomalous Hall effect from intertwined moire bands

Tingxin Li et al.

Summary: This study reveals the observation of quantum anomalous Hall effect in AB-stacked MoTe2/WSe2 moire heterobilayers, which exhibits unique band topology characteristics. At half band filling, quantized Hall resistance and vanishing longitudinal resistance are observed, indicating a topological phase transition induced by an out-of-plane electric field.

NATURE (2021)

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Article Physics, Multidisciplinary

SU(4) Chiral Spin Liquid, Exciton Supersolid, and Electric Detection in Moire Bilayers

Ya-Hui Zhang et al.

Summary: Researches propose a platform of moire bilayer where exotic quantum phases can be stabilized and detected electrically, forming SU(4) spin through interlayer coupling, and finding SU(4) symmetric crystallized phase and chiral spin liquid at balanced filling.

PHYSICAL REVIEW LETTERS (2021)

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Van der Waals heterostructure polaritons with moire-induced nonlinearity

Long Zhang et al.

Summary: Controlling matter-light interactions with cavities is crucial in modern science and technology. By integrating MoSe2-WS2 heterobilayers in a microcavity, cooperative coupling between moire-lattice excitons and microcavity photons has been established, providing versatile control of both matter and light. This moire polariton system combines strong nonlinearity and microscopic-scale tuning of matter excitations, offering a platform to study collective phenomena from tunable arrays of quantum emitters.

NATURE (2021)

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Correlated insulating states at fractional fillings of the WS2/WSe2 moire lattice

Xiong Huang et al.

Summary: Correlated insulating states at fractional fillings of moire minibands have been observed in angle-aligned WS2/WSe2 hetero-bilayers, indicating a surprisingly strong and long-range interaction beyond the nearest neighbors.

NATURE PHYSICS (2021)

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Article Multidisciplinary Sciences

Γ valley transition metal dichalcogenide moire bands

Mattia Angeli et al.

Summary: In this paper, a continuum theory of moire minibands in the valence bands of Gamma-valley homobilayers is developed, with benchmarking against large-scale ab initio electronic structure calculations. Due to the emergent D-6 symmetry, low-energy Gamma-valley moire holes are found to differ qualitatively from their K-valley counterparts, with the first three bands realizing different models.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2021)

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Article Multidisciplinary Sciences

Magic in twisted transition metal dichalcogenide bilayers

Trithep Devakul et al.

Summary: Researchers predict rich physics at small twist angles in twisted transition metal dichalcogenide bilayers, including a magic angle for flat band, interaction-driven Haldane insulator, fractional quantum anomalous Hall effect, and quantum spin Hall insulators. The combination of flat dispersion and uniformity of Berry curvature near the magic angle holds promise for realizing novel electronic phenomena in these systems.

NATURE COMMUNICATIONS (2021)

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Realization of nearly dispersionless bands with strong orbital anisotropy from destructive interference in twisted bilayer MoS2

Lede Xian et al.

Summary: The study reveals that twisted bilayer MoS2 can achieve a strongly asymmetric p(x)-p(y) Hubbard model with two almost entirely dispersionless bands due to destructive interference. The emergence of these dispersionless bands is similar to the flat bands in Lieb or Kagome lattices, and coexists with the general band flattening caused by moire interference.

NATURE COMMUNICATIONS (2021)

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Editorial Material Nanoscience & Nanotechnology

The marvels of moire materials

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)

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Article Physics, Multidisciplinary

Mott Insulating States with Competing Orders in the Triangular Lattice Hubbard Model

Alexander Wietek et al.

Summary: The physics of the triangular lattice Hubbard model exhibits a rich phenomenology, evolving from a metal-insulator transition to a spin liquid phase at intermediate coupling, and becoming a magnetic insulator at strong coupling. By combining different computational methods, researchers are able to elucidate the complex behaviors of this model, including entropy increase, the Pomeranchuk effect, and spin correlations at different coupling strengths.

PHYSICAL REVIEW X (2021)

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Entropic evidence for a Pomeranchuk effect in magic-angle graphene

Asaf Rozen et al.

Summary: The study reveals a transition from a low-entropy electronic liquid to a high-entropy correlated state in magic-angle twisted bilayer graphene under the influence of electron density, temperature, and magnetic field. The correlated state demonstrates a unique combination of properties associated with itinerant electrons and localized moments, with distinct energy scales for different characteristics. The hybrid nature of the correlated state and the separation of energy scales have significant implications for the thermodynamic and transport properties of twisted bilayer graphene.

NATURE (2021)

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Isospin Pomeranchuk effect in twisted bilayer graphene

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.

NATURE (2021)

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Article Chemistry, Physical

Stripe phases in WSe2/WS2 moire superlattices

Chenhao Jin et al.

Summary: Stripe phases were identified in WSe2/WS2 moire superlattices using optical anisotropy and electronic compressibility measurements, with a distinctive 1/2 state assigned to an insulating stripe crystal phase. The study demonstrates that two-dimensional semiconductor moire superlattices are a versatile platform for studying stripe phases and their interactions with other symmetry breaking ground states.

NATURE MATERIALS (2021)

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Signatures of moire trions in WSe2/MoSe2 heterobilayers

Erfu Liu et al.

Summary: Moire superlattices formed by van der Waals materials can support a wide range of electronic phases including Mott insulators, superconductors, and generalized Wigner crystals. The coupling of moire trions to charge carriers in tungsten diselenide/molybdenum diselenide heterobilayers leads to the emergence of new excitonic crystals with distinct properties and behaviors, motivating further theoretical and experimental studies of higher-order electron correlation effects in moire superlattices.

NATURE (2021)

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Continuous Mott transition in semiconductor moire superlattices

Tingxin Li et al.

Summary: By electrically tuning the effective interaction strength in MoTe2/WSe2 moire superlattices, a continuous metal-insulator transition is observed at a fixed filling of one electron per unit cell.

NATURE (2021)

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Article Multidisciplinary Sciences

Quantum criticality in twisted transition metal dichalcogenides

Augusto Ghiotto et al.

Summary: Metal-to-insulator transitions in twisted WSe2 exhibit strange metal behavior at low temperatures and Fermi liquid behavior at intermediate temperatures, eventually reaching an anomalous saturated regime near room temperature. This new platform allows for the study of doping and bandwidth-controlled metal-insulator quantum phase transitions on the triangular lattice.

NATURE (2021)

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Article Nanoscience & Nanotechnology

Moire trions in MoSe2/WSe2 heterobilayers

Xi Wang et al.

Summary: Researchers observed moire trions and their doping-dependent photoluminescence polarization in H-stacked MoSe2/WSe2 heterobilayers. As moire traps are filled with either electrons or holes, new sets of interlayer exciton photoluminescence peaks emerge with specific narrow linewidths. Circularly polarized photoluminescence reveals a switching polarization pattern as moire excitons transition from negatively charged to positively charged, driven by energy relaxation pathways during interlayer trion formation.

NATURE NANOTECHNOLOGY (2021)

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Article Materials Science, Multidisciplinary

Spin-valley locked instabilities in moire transition metal dichalcogenides with conventional and higher-order Van Hove singularities

Yi-Ting Hsu et al.

Summary: Recent experiments have observed correlated insulating and possible superconducting phases in twisted homobilayer transition metal dichalcogenides (TMDs). Perturbative renormalization group (RG) analysis reveals that spin-valley locking significantly affects the instabilities in homobilayer TMDs, leading to physics fundamentally different from graphene-based moire systems. The results demonstrate that moire TMDs are suitable platforms to realize various interaction-induced spin-valley locked phases.

PHYSICAL REVIEW B (2021)

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Orbitally selective Mott phase in electron-doped twisted transition metal-dichalcogenides: A possible realization of the Kondo lattice model

Amir Dalal et al.

Summary: Moire superpotentials in two-dimensional materials provide unprecedented control over the ratio of kinetic and interaction energy, opening up new avenues for studying strongly correlated physics. By extending the model into the multiorbital regime, a potentially stable orbitally selective Mott phase can be achieved in TMD materials, resembling the basic elements of the Kondo lattice model.

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Electronic structures, charge transfer, and charge order in twisted transition metal dichalcogenide bilayers

Yang Zhang et al.

Summary: This study investigates the structural relaxation and single-particle electronic structure of twisted TMD homobilayer, revealing a tunable charge transfer gap and charge orders at various fillings. It demonstrates that TMD homobilayer serves as a powerful platform for probing tunable charge transfer insulator and charge orders.

PHYSICAL REVIEW B (2021)

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Chiral Spin Liquid Phase of the Triangular Lattice Hubbard Model: A Density Matrix Renormalization Group Study

Aaron Szasz et al.

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Strongly correlated electrons and hybrid excitons in a moire heterostructure

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Leon Balents et al.

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Correlated electronic phases in twisted bilayer transition metal dichalcogenides

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Tuning Quantum Phase Transitions at Half Filling in 3L-MoTe2/WSe2 Moire Superlattices

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