Related references
Note: Only part of the references are listed.
Article
Multidisciplinary Sciences
Wenjin Zhao et al.
Summary: Scientists have realized synthetic Kondo lattice in AB-stacked MoTe2/WSe2 moire bilayers, observing heavy fermions and demonstrating gate-tunable Kondo temperatures. This study opens the possibility of accessing the phase diagram of the Kondo lattice using semiconductor moire materials.
Article
Multidisciplinary Sciences
Jiaqi Cai et al.
Summary: This study reports experimental evidence of fractional quantum anomalous Hall (FQAH) states in twisted MoTe2 bilayers. By using magnetic circular dichroism measurements and trion photoluminescence as a sensor, the researchers demonstrate the presence of FQAH states by observing the corresponding dispersion curves and linear shifts. These topological states can be electrically driven into topologically trivial states and provide a platform for exploring fractional excitations.
Article
Multidisciplinary Sciences
Eric Anderson et al.
Summary: We report in situ gate switching between honeycomb and triangular lattice geometries of an electron many-body Hamiltonian in rhombohedral (R)-stacked molybdenum ditelluride (MoTe2) moire bilayers. Our work demonstrates R-stacked MoTe2 moires to be a laboratory for engineering correlated states with nontrivial topology.
Article
Multidisciplinary Sciences
Daniele Guerci et al.
Summary: We theoretically investigate the interaction between magnetism and a heavy Fermi liquid in the AB-stacked transition metal dichalcogenide bilayer system MoTe2/WSe2. The interlayer electron transfer leads to a chiral Kondo exchange, resulting in a strong dependence of the Kondo temperature on carrier concentration and anomalous Hall effect due to topological hybridization gap. Our findings provide concrete experimental predictions for ongoing experiments on MoTe2/WSe2 bilayer heterostructures and offer a controlled route to observe a topological selective Mott transition.
Article
Multidisciplinary Sciences
Yihang Zeng et al.
Summary: This paper reports the discovery of integer and fractional Chern insulators in small-angle twisted bilayer MoTe2 at zero magnetic field, and provides experimental evidence for their topological properties. The research findings pave the way for the realization of quantized fractional Hall conductance and anyonic excitation and braiding in semiconductor moire materials.
Article
Physics, Multidisciplinary
Ming Xie et al.
Summary: The effect of interelectron Coulomb interactions on the displacement field induced topological phase transition in transition metal dichalcogenide heterobilayers is studied. It is found that a nematic excitonic insulator phase can exist when the interlayer tunneling is weak or when the Coulomb interaction is not strongly screened. The nematicity arises from the frustration between the nontrivial spatial structure of the interlayer tunneling and the interlayer coherence induced by the Coulomb interaction.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Fan Xu et al.
Article
Materials Science, Multidisciplinary
Nitin Kaushal et al.
Summary: The Wannierization starting from the continuum model reveals a more general moire Kanamori-Hubbard model beyond the standard multiorbital Hubbard model. This model can be used to study many-body physics in the Gamma valley transition metal dichalcogenide (TMD) homobilayers, including the presence of antiferromagnetic, ferromagnetic insulator, and charge density wave states. These theoretical predictions can be tested in future experiments on the Gamma valley TMD homobilayers.
Article
Physics, Multidisciplinary
Nicolas Morales-Duran et al.
Summary: We demonstrate that applying pressure to twisted WSe2 can enhance the many-body gap and region of stability of a fractional Chern insulator at filling = 1/3. Our findings are based on exact diagonalization of a continuum model, with its pressure dependence obtained through ab initio methods. We interpret our results in terms of a magic line in the pressure-vs-twist angle phase diagram, where the bandwidth of the topmost moire valence band is minimized while its quantum geometry resembles that of an ideal Chern band. We anticipate that our results can be generalized to other twisted transition metal dichalcogenide homobilayers.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Valentin Crepel et al.
Summary: We predict strong Ising ferromagnetism driven by Coulomb interaction in the metallic phase of twisted transition metal dichalcogenide homobilayers for small twist angles. The spin-valley locking and Chern band result in a completely spin-polarized half metal with a spin gap and anomalous Hall effect. Near a magic angle with an exceptionally flat Chern band, the anomalous Hall metal at 1/3 filling may transition to a root 3 x root 3 charge density wave or a fractional Chern insulator.
Article
Materials Science, Multidisciplinary
Zhihuan Dong et al.
Summary: We propose an alternative mechanism for the quantum anomalous Hall effect in the AB stacked MoTe2/WSe2 system. The system consists of two layers coupled through the Coulomb interaction, with moire lattices shifted to form a honeycomb lattice. By doping an equal number of holes and electrons into the two layers, interlayer exciton condensation occurs, leading to a Chern insulator. The polarization in the two layers can be either the same or opposite, and an intervalley-coherent Chern insulator phase is possible.
Article
Physics, Multidisciplinary
Ying-Ming Xie et al.
Summary: Moire heterobilayer transition metal dichalcogenides (TMDs) are ideal for simulating the single-band Hubbard model and interesting correlated phases have been observed in these systems. Recent research has shown that topologically nontrivial states can be observed in heterobilayers, in which pseudomagnetic fields induced by lattice relaxation play a crucial role.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Nicolas Morales-Duran et al.
Summary: Moiré materials in two-dimensional semiconductor heterobilayers are quantum simulators that can simulate unconventional states of matter in Hubbard physics, such as spin liquids, insulating ferromagnets, and superconductors. The interaction between electrons or holes in Moiré materials is more relevant compared to atomic scale systems.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Trithep Devakul et al.
Article
Physics, Multidisciplinary
Mingjie Zhang et al.
Summary: We observe special behaviors of electrons in the moiré superlattice formed between trilayer MoTe2 and monolayer WSe2, including the Pomeranchuk effect, Fermi liquid characteristics, and Lifshitz transition. These results suggest that this system is a unique platform to study rich correlation effects at an intermediate interaction strength.
Article
Physics, Multidisciplinary
Haining Pan et al.
Summary: This article presents a theoretical study on the quantum phase diagram of MoTe2/WSe2, using a self-consistent calculation method to obtain various results related to filling factors and interactions, including stable topological insulators, competing states, and topological charge density waves.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Nitin Kaushal et al.
Summary: The magnetic phase diagrams of honeycomb lattice Wigner crystals have been revealed using large-scale unrestricted Hartree-Fock techniques. Multiple phases with non-collinear and non-coplanar spin arrangements were found in the magnetic phase diagrams, suggesting the presence of exotic spin states. The magnetization evolution with external magnetic field could serve as an experimental signature of these spin states.
COMMUNICATIONS PHYSICS
(2022)
Article
Physics, Multidisciplinary
Mikael Haavisto et al.
Summary: This study demonstrates the emergence of multiferroic order in a twisted dichalcogenide bilayer superlattice due to competition between Coulomb interactions, leading to simultaneous ferrimagnetic and ferroelectric orders. The magnetoelectric coupling in this system results in a direct strong coupling between the charge and spin orders, and the topological multiferroic order gives rise to interface modes in the multiferroic domains. These topological modes can be tuned with external electric fields and triggered by supermoiré effects generated by a substrate.
Article
Materials Science, Multidisciplinary
Yao-Wen Chang et al.
Summary: This study proposes a mechanism to explain the quantum anomalous Hall effect and electric-field-induced topological phase transition in AB-stacked MoTe2/WSe2 moire heterobilayers. The Chern band of the QAH state is generated from the inversion of the highest two moire hole bands with opposite valley numbers and a gap opening induced by two Coulomb-interaction-driven magnetic orders. The Neel order ensures the insulating gap, the ferromagnetic order induces the nonzero Chern number, and both orders contribute to time-reversal symmetry breaking.
Article
Materials Science, Multidisciplinary
Louk Rademaker
Summary: This article investigates the valence flat bands in transition metal dichalcogenide heterobilayers, which exhibit strong intralayer spin-orbit coupling. By applying symmetry constraints to a tight-binding model of the valence flat bands, the author demonstrates the spin-dependent complex phase of hopping terms. Additionally, the model becomes equivalent to the Kane-Mele model of topological insulators when a perpendicular electric field causes interlayer hybridization. This proposed model serves as a starting point for understanding interactions and experimentally observed topological transitions.
Article
Multidisciplinary Sciences
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.
Article
Multidisciplinary Sciences
Fabian R. Geisenhof et al.
Summary: In this study, a state with a conductance of 2e(2)h(-1) in bilayer graphene was discovered, exhibiting magnetic hysteresis and QAH behavior driven by orbital magnetism that can be tuned via electric and magnetic fields. The observed octet of QAH phases in bilayer graphene displays peculiar ferrimagnetic and ferrielectric order characterized by quantized anomalous charge, spin, valley and spin-valley Hall behavior.
Article
Multidisciplinary Sciences
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.
Article
Multidisciplinary Sciences
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)
Article
Multidisciplinary Sciences
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)
Article
Multidisciplinary Sciences
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)
Article
Multidisciplinary Sciences
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.
Article
Multidisciplinary Sciences
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.
Article
Multidisciplinary Sciences
Yang Zhang et al.
Summary: The study reveals the formation of topological moire bands induced by displacement fields in AB-stacked TMD heterobilayers and provides a method for creating such bands. This establishes a tunable platform for realizing quantum-spin Hall and interaction-induced quantum anomalous Hall effects.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Materials Science, Multidisciplinary
Nai Chao Hu et al.
Summary: This study focused on the isolated flat moire bands in small-twist-angle transition metal dichalcogenide (TMD) heterobilayers, which are approximately described by triangular lattice generalized Hubbard models. The research explored metallic and insulating states under different control conditions at a density of one electron per moire period, and identified four different magnetic states and one nonmagnetic state near the metal-insulator phase transition line on the model phase diagram. Surprisingly, ferromagnetic insulating states stabilized by nonlocal direct exchange interactions were found to be prominent.
Article
Materials Science, Multidisciplinary
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.
Article
Physics, Multidisciplinary
Heqiu Li et al.
Summary: The study focuses on transition metal dichalcogenides (TMD) Moire superlattices with time-reversal symmetry and nontrivial spin/valley-Chern numbers. By introducing the Coulomb repulsion, gapped fractional topological states, specifically fractional Chern insulators, are stabilized at certain twisting angles and fractional filling. These fractional states break time-reversal symmetry spontaneously and exhibit contrasting Chern numbers in opposite valleys.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Multidisciplinary Sciences
Hongyi Yu et al.
NATIONAL SCIENCE REVIEW
(2020)
Article
Multidisciplinary Sciences
Yanhao Tang et al.
Article
Multidisciplinary Sciences
Emma C. Regan et al.
Article
Chemistry, Physical
Lei Wang et al.
Article
Physics, Multidisciplinary
Nick Bultinck et al.
Article
Physics, Multidisciplinary
Haining Pan et al.
PHYSICAL REVIEW RESEARCH
(2020)
Article
Multidisciplinary Sciences
Yang Xu et al.
Article
Materials Science, Multidisciplinary
Haining Pan et al.
Article
Physics, Multidisciplinary
Fengcheng Wu et al.
PHYSICAL REVIEW LETTERS
(2019)
Article
Multidisciplinary Sciences
Matthew Yankowitz et al.
Article
Materials Science, Multidisciplinary
Ya-Hui Zhang et al.
Article
Multidisciplinary Sciences
Yuan Cao et al.
Article
Physics, Multidisciplinary
Fengcheng Wu et al.
PHYSICAL REVIEW LETTERS
(2018)
Article
Multidisciplinary Sciences
Yuan Cao et al.
Article
Physics, Multidisciplinary
Mit H. Naik et al.
PHYSICAL REVIEW LETTERS
(2018)
Article
Materials Science, Multidisciplinary
M. Hohenadler et al.
Article
Materials Science, Multidisciplinary
Chen Fang et al.
Article
Physics, Multidisciplinary
Di Xiao et al.
PHYSICAL REVIEW LETTERS
(2012)
Article
Physics, Multidisciplinary
Xiao-Liang Qi
PHYSICAL REVIEW LETTERS
(2011)
Article
Physics, Multidisciplinary
Fan Zhang et al.
PHYSICAL REVIEW LETTERS
(2011)
Article
Physics, Multidisciplinary
M. Hohenadler et al.
PHYSICAL REVIEW LETTERS
(2011)
Article
Physics, Multidisciplinary
Michael Levin et al.
PHYSICAL REVIEW LETTERS
(2009)
Article
Physics, Multidisciplinary
CL Kane et al.
PHYSICAL REVIEW LETTERS
(2005)
Article
Physics, Multidisciplinary
CL Kane et al.
PHYSICAL REVIEW LETTERS
(2005)