Magic-angle twisted bilayer graphene as a topological heavy fermion problem

ZD Song, BA Bernevig - Physical review letters, 2022 - APS
Magic-angle (θ= 1.0 5°) twisted bilayer graphene (MATBG) has shown two seemingly
contradictory characters: the localization and quantum-dot-like behavior in STM …

Kondo lattice model of magic-angle twisted-bilayer graphene: Hund's rule, local-moment fluctuations, and low-energy effective theory

H Hu, BA Bernevig, AM Tsvelik - Physical review letters, 2023 - APS
We apply a generalized Schrieffer-Wolff transformation to the extended Anderson-like
topological heavy fermion (THF) model for the magic-angle (θ= 1.0 5°) twisted bilayer …

Symmetric kondo lattice states in doped strained twisted bilayer graphene

H Hu, G Rai, L Crippa, J Herzog-Arbeitman… - Physical review …, 2023 - APS
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 …

Dynamical correlations and order in magic-angle twisted bilayer graphene

G Rai, L Crippa, D Călugăru, H Hu, F Paoletti… - Physical Review X, 2024 - APS
The interplay of dynamical correlations and electronic ordering is pivotal in sha** phase
diagrams of correlated quantum materials. In magic-angle twisted bilayer graphene …

Magic-angle twisted symmetric trilayer graphene as a topological heavy-fermion problem

J Yu, M **e, BA Bernevig, S Das Sarma - Physical Review B, 2023 - APS
Recently, Song and Bernevig [Phys. Rev. Lett. 129, 047601 (2022) 0031-9007
10.1103/PhysRevLett. 129.047601] reformulated magic-angle twisted bilayer graphene as a …

Strange metallicity of moiré twisted bilayer graphene

S Das Sarma, F Wu - Physical Review Research, 2022 - APS
Recent measurements in several different laboratories report the observation of an
approximately linear-in-temperature resistivity with a large twist-angle-dependent slope (or …

Topological heavy fermion principle for flat (narrow) bands with concentrated quantum geometry

J Herzog-Arbeitman, J Yu, D Călugăru, H Hu… - arxiv preprint arxiv …, 2024 - arxiv.org
We propose a general principle for the low-energy theory of narrow bands with concentrated
Berry curvature and Fubini-Study metric in the form of a map to Anderson-"+" models …

Topological mixed valence model for twisted bilayer graphene

LLH Lau, P Coleman - arxiv preprint arxiv:2303.02670, 2023 - arxiv.org
Song and Bernevig (SB) have recently proposed a faithful reformulation of the physics of
magic angle twisted bilayer graphene (MATBG) as a topological heavy fermion problem …

Plasmonic quantum nonlinear Hall effect in noncentrosymmetric two-dimensional materials

R Toshio, N Kawakami - Physical Review B, 2022 - APS
We investigate an interplay between quantum geometrical effects and surface plasmons
through surface plasmonic structures, based on an electron hydrodynamic theory. First we …

Two -linear scattering-rate regimes in the triangular lattice Hubbard model

J Fournier, PO Downey, CD Hébert, M Charlebois… - SciPost Physics, 2024 - scipost.org
In recent years, the $ T $-linear scattering rate found at low temperatures, defining the
strange metal phase of cuprates, has been a subject of interest. Since a wide range of …