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Mechanism for Anomalous Hall Ferromagnetism in Twisted Bilayer Graphene.
A lowest Landau level model is used to understand the origin of the underlying symmetry-broken correlated state in twisted bilayer graphene, which exhibits a phase transition from a spin-valley polarized insulator to a partial or fully valley unpolarized metal as the bandwidth is increased relative to the interaction strength.
Intertwining Topological Order and Broken Symmetry in a Theory of Fluctuating Spin-Density Waves.
A SU(2) gauge theory of quantum fluctuations of magnetically ordered states which appear in a classical theory of square lattice antiferromagnets, in a spin-density wave mean field theory of thesquare lattice Hubbard model, and in a CP^{1} theory of spinons is presented.
Insulators and Metals With Topological Order and Discrete Symmetry Breaking
Numerous experiments have reported discrete symmetry breaking in the high temperature pseudogap phase of the hole-doped cuprates, including breaking of one or more of lattice rotation, inversion, or
Triangular antiferromagnetism on the honeycomb lattice of twisted bilayer graphene
We present the electronic band structures of states with the same symmetry as the three-sublattice planar antiferromagnetic order of the triangular lattice. Such states can also be defined on the
Charged skyrmions and topological origin of superconductivity in magic-angle graphene
It is shown how topological textures can mitigate Coulomb repulsion and provide a previously unexplored route to superconductivity.
Ground State and Hidden Symmetry of Magic-Angle Graphene at Even Integer Filling
In magic angle twisted bilayer graphene, electron-electron interactions play a central role resulting in correlated insulating states at certain integer fillings. Identifying the nature of these
Skyrmion Superconductivity: DMRG evidence for a topological route to superconductivity
It was recently suggested that the topology of magic-angle twisted bilayer graphene's (MATBG) flat bands could provide a novel mechanism for superconductivity distinct from both weakly-coupled BCS
Superconductivity from a confinement transition out of a fractionalized Fermi liquid with Z2 topological and Ising-nematic orders
The Schwinger-boson theory of the frustrated square lattice antiferromagnet yields a stable, gapped $\mathbb{Z}_2$ spin liquid ground state with time-reversal symmetry, incommensurate spin
Imaging stress and magnetism at high pressures using a nanoscale quantum sensor
A nanoscale sensing platform that integrates nitrogen-vacancy (NV) color centers directly into the culet of diamond anvils is introduced and the versatility of this platform is demonstrated by performing diffraction-limited imaging of both stress fields and magnetism as a function of pressure and temperature.
Fractionalized Fermi liquid with bosonic chargons as a candidate for the pseudogap metal
Doping a Mott-insulating $\mathbb{Z}_2$ spin liquid can lead to a fractionalized Fermi liquid (FL*). Such a phase has several favorable features that make it a candidate for the pseudogap metal for