Flat bands, strange metals and the Kondo effect

JG Checkelsky, BA Bernevig, P Coleman, Q Si… - Nature Reviews …, 2024 - nature.com
Flat-band materials such as the kagome metals or moiré superlattices are of intense current
interest. Flat bands can result from the electron motion on numerous (special) lattices and …

A microscopic perspective on moiré materials

KP Nuckolls, A Yazdani - Nature Reviews Materials, 2024 - nature.com
Contemporary quantum materials research is guided by themes of topology and electronic
correlations. A confluence of these two themes is engineered in moiré materials, an …

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 shaping phase
diagrams of correlated quantum materials. In magic-angle twisted bilayer graphene …

Quantum criticality and entanglement for the two-dimensional long-range Heisenberg bilayer

M Song, J Zhao, Y Qi, J Rong, ZY Meng - Physical Review B, 2024 - APS
The study of quantum criticality and entanglement in systems with long-range (LR)
interactions is still in its early stages, with many open questions remaining to be explored. In …

Topological flat bands, valley polarization, and interband superconductivity in magic-angle twisted bilayer graphene with proximitized spin-orbit couplings

YZ Chou, Y Tan, F Wu, S Das Sarma - Physical Review B, 2024 - APS
We study theoretically the magic-angle twisted bilayer graphene with proximity-induced
Ising and Rashba spin-orbit couplings on the top layer. Topological flat bands (with three …

Finite-temperature critical behaviors in 2D long-range quantum Heisenberg model

J Zhao, M Song, Y Qi, J Rong, ZY Meng - npj Quantum Materials, 2023 - nature.com
Abstract The Mermin-Wagner theorem states that spontaneous continuous symmetry
breaking is prohibited in systems with short-range interactions at spatial dimension D≤ 2 …

Topological mixed valence model in magic-angle twisted bilayer graphene

Y Li, BM Fregoso, M Dzero - Physical Review B, 2024 - APS
We develop a model to describe the mixed valence regime in magic-angle twisted bilayer
graphene (MATBG) using the recently developed heavy-fermion framework. By employing …

Atomistic theory of the moiré Hofstadter butterfly in magic-angle graphene

A Wania Rodrigues, M Bieniek, P Potasz, D Miravet… - Physical Review B, 2024 - APS
We present here a Hofstadter's butterfly spectrum for the magic-angle twisted bilayer
graphene obtained using an ab initio-based multimillion-atom tight-binding model. We …

Kondo effect and its destruction in heterobilayer transition metal dichalcogenides

F Xie, L Chen, Q Si - Physical Review Research, 2024 - APS
Moiré structures, along with line-graph-based d-electron systems, represent a setting to
realize flat bands. One form of the associated strong correlation physics is the Kondo effect …

Moir\'{e} optical phonons dancing with heavy electrons in magic-angle twisted bilayer graphene

H Shi, W Miao, X Dai - arXiv preprint arXiv:2402.11824, 2024 - arxiv.org
Electron-phonon coupling in magic-angle twisted bilayer graphene is an important but
difficult topic. We propose a scheme to simplify and understand this problem. Weighted by …