☆ 4.8 Article

Correlated Hofstadter spectrum and flavour phase diagram in magic-angle twisted bilayer graphene

NATURE PHYSICS (2022)

相关参考文献

注意：仅列出部分参考文献，下载原文获取全部文献信息。

Article Materials Science, Multidisciplinary

Pair-density-wave in the strong coupling limit of the Holstein-Hubbard model

Kevin S. Huang et al.

Summary: In this study, a density-matrix renormalization-group study was conducted on PDW superconducting states on long triangular cylinders, revealing strong quasi-long-range PDW order, divergent PDW susceptibility, and the spontaneous breaking of time-reversal and inversion symmetries. The state was identified as valley-polarized and the PDW was found to arise from intra-pocket pairing with an incommensurate center of mass momentum. This study also observed an unusual realization of a Luther-Emery liquid in the two-leg case.

NPJ QUANTUM MATERIALS (2022)

添加到收藏夹

Article Multidisciplinary Sciences

Correlation-driven topological phases in magic-angle twisted bilayer graphene

Youngjoon Choi et al.

Summary: Magic-angle twisted bilayer graphene (MATBG) exhibits a variety of correlated phenomena, and new techniques introduced can determine the topological phases that emerge in MATBG in a finite magnetic field. These topological phases form only in a specific range of twist angles and are influenced by strong electronic interactions.

NATURE (2021)

添加到收藏夹

Article Physics, Multidisciplinary

Hofstadter subband ferromagnetism and symmetry-broken Chern insulators in twisted bilayer graphene

Yu Saito et al.

Summary: A small twist between two layers of graphene can lead to flat band structures, which can form ferromagnetic Chern insulators when the moire superlattice interacts with a magnetic field. In twisted bilayer graphene, Coulomb interactions and magnetic field effects give rise to new quantum states.

NATURE PHYSICS (2021)

添加到收藏夹

Article Physics, Multidisciplinary

Unconventional sequence of correlated Chern insulators in magic-angle twisted bilayer graphene

Andrew T. Pierce et al.

Summary: The discovery of unexpected incompressible states in MATBG, with Chern numbers incompatible with the simple sequential band filling assumption, can be understood as a consequence of broken translation symmetry that doubles the moire unit cell and splits each flavour band in two. These unusual incompressible phases expand the known phase diagram of MATBG and shed light on the close competition between different correlated phases in the system.

NATURE PHYSICS (2021)

添加到收藏夹

Article Physics, Multidisciplinary

Cascades between Light and Heavy Fermions in the Normal State of Magic-Angle Twisted Bilayer Graphene

Jian Kang et al.

Summary: The research presents a framework for understanding the cascade transitions and Landau level degeneracies of twisted bilayer graphene, which sheds light on new insights. By varying the filling, different mass excitations can be generated, explaining the diversity of features observed.

PHYSICAL REVIEW LETTERS (2021)

添加到收藏夹

Article Physics, Multidisciplinary

Competing Zero-Field Chern Insulators in Superconducting Twisted Bilayer Graphene

Petr Stepanov et al.

Summary: Research has shown that the odd integer filling factors in h-BN nonaligned devices correspond to symmetry broken Chern insulators with a Chern number of C = +1 and a relatively high Curie temperature. Under a perpendicular magnetic field, the Chern insulator at v = +1 transitions from C = +1 to C = 3, characterized by a quantized Hall plateau. Additionally, the device exhibits strong superconducting phases with critical temperatures up to Tc ≈ 3.5 K.

PHYSICAL REVIEW LETTERS (2021)

添加到收藏夹

Article Chemistry, Physical

Chern insulators, van Hove singularities and topological flat bands in magic-angle twisted bilayer graphene

Shuang Wu et al.

Summary: In magic-angle twisted bilayer graphene, doping-induced Lifshitz transitions and van Hove singularities lead to the emergence of correlation-induced gaps and topologically non-trivial subbands. With the presence of a magnetic field, quantized Hall plateaus reveal the subband topology and signal the emergence of Chern insulators with Chern numbers. Additionally, a van Hove singularity at a filling of 3.5 suggests the possibility of a fractional Chern insulator, accompanied by a crossover from low-temperature metallic to high-temperature insulating behavior.

NATURE MATERIALS (2021)

添加到收藏夹

Review Physics, Multidisciplinary

Moire heterostructures as a condensed-matter quantum simulator

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.

NATURE PHYSICS (2021)

添加到收藏夹

Article Physics, Multidisciplinary

Symmetry-broken Chern insulators and Rashba-like Landau-level crossings in magic-angle bilayer graphene

Ipsita Das et al.

Summary: The study presents a rich sequence of quantized Hall conductance regions in magic-angle twisted bilayer graphene (MATBG), driven by specific electronic interactions, revealing the complex nature of symmetry breaking in MATBG. Analysis of Landau level crossings provides constraints on the parameters of the MATBG Hamiltonian and allows for quantitative tests of proposed microscopic scenarios for its electronic phases.

NATURE PHYSICS (2021)

添加到收藏夹

Article Multidisciplinary Sciences

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)

添加到收藏夹

Article Multidisciplinary Sciences

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)

添加到收藏夹

Article Multidisciplinary Sciences

Flavour Hund's coupling, Chern gaps and charge diffusivity in moire graphene

Jeong Min Park et al.

Summary: Interaction-driven spontaneous symmetry breaking plays a key role in the emergence of correlated and topological ground states in moire systems such as magic-angle twisted bilayer graphene (MATBG). Through thermodynamic and transport measurements, we have observed broken spin/valley 'flavour' symmetry in MATBG and its nontrivial topology. Furthermore, the topological nature of the flat bands is revealed by breaking time-reversal symmetry, leading to the observation of Chern insulator states with different Chern numbers at specific filling factors. Our findings shed light on the understanding of interactions in the topological bands of MATBG, both with and without a magnetic field.

NATURE (2021)

添加到收藏夹

Article Multidisciplinary Sciences

Nematicity and competing orders in superconducting magic-angle graphene

Yuan Cao et al.

Summary: In magic-angle twisted bilayer graphene, intertwined phases with broken rotational symmetry have been identified, showing strong thermodynamic anisotropy and appearing above the underdoped region of the superconducting dome. A reduction in critical temperature is observed when it intersects with the superconducting dome, with the superconducting state exhibiting anisotropic response to in-plane magnetic fields, suggesting nematic ordering plays a significant role in the low-temperature phases of magic-angle TBG.

SCIENCE (2021)

添加到收藏夹

Article Multidisciplinary Sciences

Tuning electron correlation in magic-angle twisted bilayer graphene using Coulomb screening

Xiaoxue Liu et al.

Summary: This study introduces a new device geometry to continuously tune the strength of electron-electron Coulomb interaction within twisted bilayer graphene, revealing opposite effects of charge screening on insulating and superconducting states.

SCIENCE (2021)

添加到收藏夹

Article Multidisciplinary Sciences

Half- and quarter-metals in rhombohedral trilayer graphene

Haoxin Zhou et al.

Summary: In this study, we demonstrate the spontaneous ferromagnetic polarization in rhombohedral trilayer graphene driven by gate-tuned van Hove singularities. Through capacitance and transport measurements, a cascade of transitions tuned to density and electronic displacement field are observed. The results show that rhombohedral graphene is an ideal platform for controlled tests of many-body theory, revealing the fundamentally itinerant nature of magnetism in moire materials.

NATURE (2021)

添加到收藏夹

Article Physics, Multidisciplinary

Strain-Induced Quantum Phase Transitions in Magic-Angle Graphene

Daniel E. Parker et al.

Summary: Research on magic-angle twisted bilayer graphene reveals that small strain values can drive a zero-temperature phase transition between the symmetry-broken Kramers intervalley-coherent insulator and nematic semimetal. The critical strain falls within the experimentally observed range, suggesting that strain may partially account for sample-dependent experimental observations.

PHYSICAL REVIEW LETTERS (2021)

添加到收藏夹

Article Materials Science, Multidisciplinary

Twisted bilayer graphene. IV. Exact insulator ground states and phase diagram

Biao Lian et al.

Summary: This study investigates the exact insulator states and Chern insulators in different limits of the projected Hamiltonian for magic-angle twisted bilayer graphene flat bands with Coulomb interactions. The results show competitive low-energy states of TBG, with different Chern number states being degenerate in certain limits. Transition behaviors are also observed in the presence of magnetic fields. The TBG Hamiltonian converges into an extended Hubbard model in the stabilizer code limit.

PHYSICAL REVIEW B (2021)

添加到收藏夹

Article Multidisciplinary Sciences

Intrinsic quantized anomalous Hall effect in a moire heterostructure

M. Serlin et al.

SCIENCE (2020)

添加到收藏夹

Article Multidisciplinary Sciences

Mapping the twist-angle disorder and Landau levels in magic-angle graphene

A. Uri et al.

NATURE (2020)

添加到收藏夹

Article Physics, Multidisciplinary

Independent superconductors and correlated insulators in twisted bilayer graphene

Yu Saito et al.

NATURE PHYSICS (2020)

添加到收藏夹

Article Multidisciplinary Sciences

Superconductivity in metallic twisted bilayer graphene stabilized by WSe2

Harpreet Singh Arora et al.

NATURE (2020)

添加到收藏夹

Article Multidisciplinary Sciences

Cascade of electronic transitions in magic-angle twisted bilayer graphene

Dillon Wong et al.

NATURE (2020)

添加到收藏夹

Article Multidisciplinary Sciences

Untying the insulating and superconducting orders in magic-angle graphene

Petr Stepanov et al.

NATURE (2020)

添加到收藏夹

Article Multidisciplinary Sciences

Cascade of phase transitions and Dirac revivals in magic-angle graphene

U. Zondiner et al.

NATURE (2020)

添加到收藏夹

Article Multidisciplinary Sciences

Strongly correlated Chern insulators in magic-angle twisted bilayer graphene

Kevin P. Nuckolls et al.

NATURE (2020)

添加到收藏夹

Article Materials Science, Multidisciplinary

Landau level of fragile topology

Biao Lian et al.

PHYSICAL REVIEW B (2020)

添加到收藏夹

Article Multidisciplinary Sciences

Tuning superconductivity in twisted bilayer graphene

Matthew Yankowitz et al.

SCIENCE (2019)

添加到收藏夹

Article Multidisciplinary Sciences

Spectroscopic signatures of many-body correlations in magic-angle twisted bilayer graphene

Yonglong Xie et al.

NATURE (2019)

添加到收藏夹

Article Multidisciplinary Sciences

Maximized electron interactions at the magic angle in twisted bilayer graphene

Alexander Kerelsky et al.

NATURE (2019)

添加到收藏夹

Article Multidisciplinary Sciences

Charge order and broken rotational symmetry in magic-angle twisted bilayer graphene

Yuhang Jiang et al.

NATURE (2019)

添加到收藏夹

Article Physics, Multidisciplinary

Strong Coupling Phases of Partially Filled Twisted Bilayer Graphene Narrow Bands

Jian Kang et al.

PHYSICAL REVIEW LETTERS (2019)

添加到收藏夹

Article Physics, Multidisciplinary

Electronic Compressibility of Magic-Angle Graphene Superlattices

S. L. Tomarken et al.

PHYSICAL REVIEW LETTERS (2019)

添加到收藏夹

Article Multidisciplinary Sciences

Emergent ferromagnetism near three-quarters filling in twisted bilayer graphene

Aaron L. Sharpe et al.

SCIENCE (2019)

添加到收藏夹

Article Physics, Multidisciplinary

Electronic correlations in twisted bilayer graphene near the magic angle

Youngjoon Choi et al.

NATURE PHYSICS (2019)

添加到收藏夹

Article Multidisciplinary Sciences

Superconductors, orbital magnets and correlated states in magic-angle bilayer graphene

Xiaobo Lu et al.

NATURE (2019)

添加到收藏夹

Article Physics, Multidisciplinary

Evidence of a gate-tunable Mott insulator in a trilayer graphene moire superlattice

Guorui Chen et al.

NATURE PHYSICS (2019)

添加到收藏夹

Article Materials Science, Multidisciplinary

Landau level degeneracy in twisted bilayer graphene: Role of symmetry breaking

Ya-Hui Zhang et al.

PHYSICAL REVIEW B (2019)

添加到收藏夹

Article Materials Science, Multidisciplinary

Pseudo Landau level representation of twisted bilayer graphene: Band topology and implications on the correlated insulating phase

Jianpeng Liu et al.

PHYSICAL REVIEW B (2019)

添加到收藏夹

Article Materials Science, Multidisciplinary

Designing flat bands by strain

Zhen Bi et al.

PHYSICAL REVIEW B (2019)

添加到收藏夹

Article Materials Science, Multidisciplinary

Landau levels in twisted bilayer graphene and semiclassical orbits

Kasra Hejazi et al.

PHYSICAL REVIEW B (2019)

添加到收藏夹

Article Multidisciplinary Sciences

Unconventional superconductivity in magic-angle graphene superlattices

Yuan Cao et al.

NATURE (2018)

添加到收藏夹

Article Multidisciplinary Sciences

Correlated insulator behaviour at half-filling in magic-angle graphene superlattices

Yuan Cao et al.

NATURE (2018)

添加到收藏夹

Article Multidisciplinary Sciences

One-Dimensional Electrical Contact to a Two-Dimensional Material

L. Wang et al.

SCIENCE (2013)

添加到收藏夹

Article Materials Science, Multidisciplinary

Energy spectrum and quantum Hall effect in twisted bilayer graphene

Pilkyung Moon et al.

PHYSICAL REVIEW B (2012)

添加到收藏夹

Article Materials Science, Multidisciplinary

Moire butterflies in twisted bilayer graphene

R. Bistritzer et al.

PHYSICAL REVIEW B (2011)

添加到收藏夹

Article Multidisciplinary Sciences

Moire bands in twisted double-layer graphene

Rafi Bistritzer et al.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2011)

添加到收藏夹

© Peeref 2019-2024. All rights reserved.