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Heavy fermions, mass renormalization and local moments in magic-angle twisted bilayer graphene via planar tunneling spectroscopy
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Topological heavy fermion models[1-5] describe the flat bands in magic-angle twisted bilayer graphene (MATBG) as arising from the hybridization between localized flat-band orbitals (f-electrons) and nearly-free conduction bands (c-electrons). The interplay between these f-electrons and c-electrons is theorized to give rise to emergent phenomena, including unconventional superconductivity[6-8], non-Fermi liquid behavior[9-11], and topologically nontrivial phases[12-14]. However, the fundamental properties of f- and c-electrons, such as their respective heavy and light effective mass and their properties under strain, need experimental verification. Here we report on the electronic inverse compressibility, effective mass, and entropy of MATBG, obtained from planar tunneling spectroscopy. Our results include the observation of electron mass renormalization, found to be consistent with the topological heavy fermion model prediction of heavy charge-one excitations away from integer fillings. Importantly, we present entropic evidence for 4-fold and 8-fold degenerate isospin local moment states emerging at temperatures of 10K and 20K, respectively, consistent with the entropy of 8 heavy-fermions flavors energetically split by the sample strain.
Forward citations
Cited by 8 Pith papers
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Trion Excitations in Twisted Bilayer Graphene: A Quantum Monte Carlo Study
Finite-temperature QMC of twisted bilayer graphene finds gapless 'Dirac trion' three-particle excitations in the normal state, exactly orthogonal to electrons at the Γ point.
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Monte Carlo Studies of Twisted Bilayer Graphene: Strain and Thermal Fluctuations
Sign-problem-free quantum Monte Carlo shows that strained twisted bilayer graphene at charge neutrality hosts a KIVC insulator bounded by Dirac and anisotropic semimetals, with a 15–40 K entropy plateau from a Mott-li...
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Mixed-dimensional quantum Monte Carlo studies of M-point moir\'e materials
Introduces an efficient SSE QMC algorithm with global updates and parallel tempering for mixed-dimensional models and applies it to map angle-dependent correlated insulators and Wigner-Mott states in M-point twisted A...
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Link between thermodynamic correlation signatures and superconductivity in twisted trilayer graphene
In helically twisted trilayer graphene, the superconducting critical temperature scales with the sawtooth compressibility strength as a function of twist angle, with electron-hole asymmetry, while showing no direct li...
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Randomly twisted bilayer graphene -- the cascade transitions
Random twist-angle disorder near the magic angle is proposed as the mechanism behind the integer-filling cascade transitions in twisted bilayer graphene.
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Correlated Mott semi-metal in the topological heavy fermion model
Hubbard operator method captures coupling between localized and itinerant electrons in the topological heavy fermion model, agreeing with DQMC while local approximations like Hubbard-I fail.
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Controlled Loop Expansion for the Topological Heavy Fermion Model
A loop expansion in the topological heavy fermion model yields quasiparticle lifetimes and a Curie-Weiss flavor susceptibility above the ordering temperature despite strong interactions.
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Interplay between many-body correlations, strain and lattice relaxation in twisted bilayer graphene
Strain splitting of the flat bands plus relaxation-induced particle-hole asymmetry in a DMFT treatment of the heavy-fermion model accounts for the persistent ~10 meV STM/QTM feature, the entropy behavior, and the asym...
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