Publications by authors named "Julian Ingham"
Ultraclean graphene at charge neutrality hosts a quantum critical Dirac fluid of interacting electrons and holes. Interactions profoundly affect the charge dynamics of graphene, which is encoded in the properties of its electron-photon collective modes: surface plasmon polaritons (SPPs). Here, we show that polaritonic interference patterns are particularly well suited to unveil the interactions in Dirac fluids by tracking polaritonic interference in time at temporal scales commensurate with the electronic scattering.
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- - The study observes a new type of order, called intra-unit-cell nematic order, in the kagome metal ScVSn, which breaks the crystal's rotational symmetry.
- - Using advanced scanning techniques, researchers found stripe-like patterns and specific electron behavior that demonstrate this symmetry breaking and the deformation of the Fermi surface.
- - This research connects the concepts of electronic nematicity with kagome physics, offering insights into how symmetry-broken phases can emerge in materials with correlated electrons.
Recent experiments on kagome metals AVSb (A=K,Rb,Cs) identify twofold van Hove singularities (TvHS) with opposite concavity near the Fermi energy, generating two approximately hexagonal Fermi surfaces - one electron-like and the other hole-like. Here we propose that a TvHS generates a novel time-reversal symmetry breaking excitonic order - arising due to bound pairs of electrons and holes located at opposite concavity van Hove singularities. We introduce a minimal model for the TvHS and investigate interaction induced many-body instabilities via the perturbative renormalisation group technique and a free energy analysis.
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