Results 41 to 50 of about 24,312 (276)
Magic-Angle Twisted Bilayer Graphene as a Topological Heavy Fermion Problem. [PDF]
Physical Review Letters, 2021 Magic-angle (θ=1.05°) twisted bilayer graphene (MATBG) has shown two seemingly contradictory characters: the localization and quantum-dot-like behavior in STM experiments, and delocalization in transport experiments. We construct a model, which naturally
Zhi-Da Song, B. Bernevig
semanticscholar +1 more source
Understanding symmetry breaking in twisted bilayer graphene from cluster constraints
Physical Review Research, 2023 Twisted bilayer graphene is an exciting platform for exploring correlated quantum phases, extremely tunable with respect to both the single-particle bands and the interaction profile of electrons. Here, we investigate the phase diagram of twisted bilayer
Nikita Astrakhantsev +4 more
doaj +1 more source
Correlated states in twisted double bilayer graphene [PDF]
, 2020 Electron-electron interactions play an important role in graphene and related systems and can induce exotic quantum states, especially in a stacked bilayer with a small twist angle. For bilayer graphene where the two layers are twisted by a "magic angle",
Chu, Yanbang +15 more
core +2 more sources
Quantum critical behaviour in magic-angle twisted bilayer graphene [PDF]
Nature Physics, 2021 The flat bands1 of magic-angle twisted bilayer graphene (MATBG) host strongly correlated electronic phases such as correlated insulators2–6, superconductors7–11 and a strange metal state12.
Alexandre Jaoui +9 more
semanticscholar +1 more source
Intrinsic superflat bands in general twisted bilayer systems
Light: Science & Applications, 2022 Twisted bilayer systems with discrete magic angles, such as twisted bilayer graphene featuring moiré superlattices, provide a versatile platform for exploring novel physical properties.
Hongfei Wang +3 more
doaj +1 more source
Cascade of transitions in twisted and non-twisted graphene layers within the van Hove scenario
npj Quantum Materials, 2022 Motivated by measurements of compressibility and STM spectra in twisted bilayer graphene, we analyze the pattern of symmetry breaking for itinerant fermions near a van Hove singularity. Making use of an approximate SU(4) symmetry of the Landau functional,
Dmitry V. Chichinadze +3 more
doaj +1 more source
Spontaneous time-reversal symmetry breaking in twisted double bilayer graphene
Nature Communications, 2022 Twisted double bilayer graphene (tDBG) comprises two Bernal-stacked bilayer graphene sheets with a twist between them. Here, the authors report a strong anomalous Hall effect in the correlated-metal regime of tDBG, indicating time reversal symmetry ...
Manabendra Kuiri +8 more
doaj +1 more source
Symmetries as the Guiding Principle for Flattening Bands of Dirac Fermions
Physical Review X, 2023 Since the discovery of magic-angle twisted bilayer graphene, flat bands in Dirac materials have become a prominent platform for realizing strong correlation effects in electronic systems.
Yarden Sheffer +2 more
doaj +1 more source
Chiral model of twisted bilayer graphene realized in a monolayer [PDF]
Physical review B, 2023 We demonstrate that a single layer of graphene subject to a superlattice potential nearly commensurate to a $\sqrt{3} \times \sqrt{3}$ supercell exactly maps to the chiral model of twisted bilayer graphene, albeit with half as many degrees of freedom. We
V. Cr'epel +4 more
semanticscholar +1 more source
Moiré Band Topology in Twisted Bilayer Graphene [PDF]
Nano Letters, 2020 Recently twisted bilayer graphene (t-BLG) emerges as a new strongly correlated physical platform near a magic twist angle, which hosts many exciting phenomena such as the Mott-like insulating phases, unconventional superconducting behavior and emergent ferromagnetism.
Chao Ma +11 more
openaire +3 more sources