Observation of a flat band and bandgap in millimeter-scale twisted bilayer graphene
Communications Materials, 2021 Magic-angle twisted bilayer graphene is interesting for its correlated superconducting and insulating states, but samples are typically micrometer-scale.
Keiju Sato +13 more
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Kondo Lattice Model of Magic-Angle Twisted-Bilayer Graphene: Hund's Rule, Local-Moment Fluctuations, and Low-Energy Effective Theory. [PDF]
Physical Review Letters, 2023 We apply a generalized Schrieffer-Wolff transformation to the extended Anderson-like topological heavy fermion (THF) model for the magic-angle (θ=1.05°) twisted bilayer graphene (MATBLG) [Phys. Rev. Lett.
Haoyu Hu, B. Bernevig, A. Tsvelik
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Emergent ferromagnetism near three-quarters filling in twisted bilayer graphene [PDF]
Science, 2019 Twisted bilayer graphene goes magnetic When two layers of graphene in a bilayer are twisted with respect to each other by just the right, “magic,” angle, the electrons in the system become strongly correlated. As the electronic density is tuned by gating,
Aaron L. Sharpe +7 more
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Dynamical Correlations and Order in Magic-Angle Twisted Bilayer Graphene [PDF]
Physical Review X, 2023 The interplay of dynamical correlations and electronic ordering is pivotal in shaping phase diagrams of correlated quantum materials. In magic-angle twisted bilayer graphene, transport, thermodynamic, and spectroscopic experiments pinpoint a competition ...
Gautam Rai +10 more
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Opportunities and Challenges in Twisted Bilayer Graphene: A Review
Nano-Micro Letters, 2020 Two-dimensional (2D) materials exhibit enhanced physical, chemical, electronic, and optical properties when compared to those of bulk materials. Graphene demands significant attention due to its superior physical and electronic characteristics among ...
Amol Nimbalkar, Hyunmin Kim
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Enhanced third-harmonic generation by manipulating the twist angle of bilayer graphene
Light: Science & Applications, 2021 Nonlinear optics: When graphene ‘does the twist’ Modifying the angle between the two layers of twisted bilayer graphene can considerably improve how photons interact with it to generate higher-energy photons.
Seongju Ha +13 more
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Symmetric Kondo Lattice States in Doped Strained Twisted Bilayer Graphene. [PDF]
Physical Review Letters, 2023 We use the topological heavy fermion (THF) model and its Kondo lattice (KL) formulation to study the possibility of a symmetric Kondo (SK) state in twisted bilayer graphene. Via a large-N approximation, we find a SK state in the KL model at fillings ν=0,±
Haoyu Hu +9 more
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Kondo phase in twisted bilayer graphene [PDF]
Physical review B, 2023 A number of interesting physical phenomena have been discovered in magic-angle twisted bilayer graphene (MATBG), such as superconductivity, correlated gapped and gapless phases, etc. The gapped phases are believed to be symmetry-breaking states described
Geng Zhou +3 more
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Twisted bilayer graphene as topological heavy fermion: II. Analytical approximations of the model parameters [PDF]
Low temperature physics (Woodbury, N.Y., Print), 2023 The recently-introduced topological heavy fermion (THF) model [1] of twisted bilayer graphene (TBG) aims to reconcile the quantum-dot-like electronic structure of the latter observed by scanning tunneling microscopy, with its electron delocalization seen
D. Călugăru +5 more
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Topological piezoelectric response in moiré graphene systems
Physical Review Research, 2022 We theoretically study the piezoelectric effects in moirè graphene systems. Since the strain couples to the electrons in the system as an effective vector field, which has opposite signs for the K and K^{′} valleys of graphene, its effects on the two ...
Ran Peng, Jianpeng Liu
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