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Gate-tunable heavy fermions in a moiré Kondo lattice
Wenjin Zhao, Bowen Shen, Zui Tao +6
The Kondo lattice, describing a matrix of local magnetic moments coupled via spin-exchange interactions to itinerant conduction electrons, is a prototype of strongly correlated qua…
Hierarchy of Symmetry Breaking Correlated Phases in Twisted Bilayer Graphene
Robert Polski, Yiran Zhang, Yang Peng +8
Twisted bilayer graphene (TBG) near the magic twist angle of exhibits a rich phase diagram. However, the interplay between different phases and their dependence on tw…
Spectroscopy Signatures of Electron Correlations in a Trilayer Graphene/hBN Moiré Superlattice
Jixiang Yang, Guorui Chen, Tianyi Han +12
ABC-stacked trilayer graphene/hBN moiré superlattice (TLG/hBN) has emerged as a playground for correlated electron physics. We report spectroscopy measurements of dual-gated TLG/hB…
Pomeranchuk Effect and Tunable Quantum Phase Transitions in 3L-MoTe2/WSe2
Mingjie Zhang, Xuan Zhao, Kenji Watanabe +5
Many sought-after exotic states of matter are known to emerge close to quantum phase transitions, such as quantum spin liquids (QSL) and unconventional superconductivity. It is thu…
Tunable bilayer Hubbard model physics in twisted WSe2
Yang Xu, Kaifei Kang, Kenji Watanabe +3
Moiré materials with flat electronic bands provide a highly controllable quantum system for studies of strong-correlation physics and topology. In particular, angle-aligned heterob…
Observation of re-entrant correlated insulators and interaction driven Fermi surface reconstructions at one magnetic flux quantum per moiré unit cell in magic-angle twisted bilayer graphene
Ipsita Das, Cheng Shen, Alexandre Jaoui +8
The discovery of flat bands with non-trivial band topology in magic angle twisted bi-layer graphene (MATBG) has provided a unique platform to study strongly correlated phe-nomena i…
Imaging gate-tunable Tomonaga-Luttinger liquids in 1H-MoSe mirror twin boundaries
Tiancong Zhu, Wei Ruan, Yan-Qi Wang +15
One-dimensional electron systems (1DESs) exhibit properties that are fundamentally different from higher-dimensional systems. For example, electron-electron interactions in 1DESs h…
Dipolar excitonic insulator in a moire lattice
Jie Gu, Liguo Ma, Song Liu +5
Two-dimensional (2D) moire materials provide a new solid-state platform with unprecedented controllability for studies of correlated quantum phenomena. To date, experimental studie…
Quantum critical behavior in magic-angle twisted bilayer graphene
Alexandre Jaoui, Ipsita Das, Giorgio Di Battista +7
The flat bands of magic-angle twisted bilayer graphene (MATBG) host strongly-correlated electronic phases such as correlated insulators, superconductors and a strange-metal state.…
Correlated Hofstadter Spectrum and Flavor Phase Diagram in Magic Angle Graphene
Jiachen Yu, Benjamin A. Foutty, Zhaoyu Han +8
In magic angle twisted bilayer graphene (MATBG), the moiré superlattice potential gives rise to narrow electronic bands1 which support a multitude of many-body quantum phases. Furt…
Evidence for a single-layer van der Waals multiferroic
Qian Song, Connor A. Occhialini, Emre Ergeçen +10
Multiferroic materials have garnered wide interest for their exceptional static and dynamical magnetoelectric properties. In particular, type-II multiferroics exhibit an inversion-…
Topological charge density waves at half-integer filling of a moiré superlattice
Hryhoriy Polshyn, Yuxuan Zhang, Manish A. Kumar +7
At partial filling of a flat band, strong electronic interactions may favor gapped states harboring emergent topology with quantized Hall conductivity. Emergent topological states…
Continuous Mott transition in semiconductor moiré superlattices
Tingxin Li, Shengwei Jiang, Lizhong Li +9
The evolution of a Landau Fermi liquid into a nonmagnetic Mott insulator with increasing electronic interactions is one of the most puzzling quantum phase transitions in physics. T…
Charge-order-enhanced capacitance in semiconductor moiré superlattices
Tingxin Li, Jiacheng Zhu, Yanhao Tang +5
Van der Waals moiré materials have emerged as a highly controllable platform to study the electronic correlation phenomena. In particular, robust correlated insulating states have…
Interaction-driven Band Flattening and Correlated Phases in Twisted Bilayer Graphene
Youngjoon Choi, Hyunjin Kim, Cyprian Lewandowski +8
Flat electronic bands, characteristic of magic-angle twisted bilayer graphene (TBG), host a wealth of correlated phenomena. Early theoretical considerations suggested that, at the…
Competing correlated states and abundant orbital magnetism in twisted monolayer-bilayer graphene
Minhao He, Ya-Hui Zhang, Yuhao Li +5
Flat band moiré superlattices have recently emerged as unique platforms for investigating the interplay between strong electronic correlations, nontrivial band topology, and multip…
Universal moiré nematic phase in twisted graphitic systems
Carmen Rubio-Verdú, Simon Turkel, Larry Song +12
Graphene moiré superlattices display electronic flat bands. At integer fillings of these flat bands, energy gaps due to strong electron-electron interactions are generally observed…
Tracing out Correlated Chern Insulators in Magic Angle Twisted Bilayer Graphene
Youngjoon Choi, Hyunjin Kim, Yang Peng +9
Magic-angle twisted bilayer graphene (MATBG) exhibits a range of correlated phenomena that originate from strong electron-electron interactions. These interactions make the Fermi s…
Visualizing delocalized correlated electronic states in twisted double bilayer graphene
Canxun Zhang, Tiancong Zhu, Salman Kahn +12
The discovery of interaction-driven insulating and superconducting phases in moiré van der Waals heterostructures has sparked considerable interest in understanding the novel corre…
Symmetry broken Chern insulators and magic series of Rashba-like Landau level crossings in magic angle bilayer graphene
Ipsita Das, Xiaobo Lu, Jonah Herzog-Arbeitman +5
Flat-bands in magic angle twisted bilayer graphene (MATBG) have recently emerged as a rich platform to explore strong correlations, superconductivity and mag-netism. However, the p…
Abundance of correlated insulating states at fractional fillings of WSe/WS moiré superlattices
Yang Xu, Song Liu, Daniel A Rhodes +6
Quantum particles on a lattice with competing long-range interactions are ubiquitous in physics. Transition metal oxides, layered molecular crystals and trapped ion arrays are a fe…
Electrical switching of magnetic order in an orbital Chern insulator
Hryhoriy Polshyn, Jihang Zhu, Manish A. Kumar +8
Magnetism typically arises from the joint effect of Fermi statistics and repulsive Coulomb interactions, which favors ground states with non-zero electron spin. As a result, contro…
Direct evidence for flat bands in twisted bilayer graphene from nano-ARPES
Simone Lisi, Xiaobo Lu, Tjerk Benschop +21
Transport experiments in twisted bilayer graphene revealed multiple superconducting domes separated by correlated insulating states. These properties are generally associated with…
Accessing the spectral function in a current-carrying device
Davide Curcio, Alfred J. H. Jones, Ryan Muzzio +12
The presence of an electrical transport current in a material is one of the simplest and most important realisations of non-equilibrium physics. The current density breaks the crys…