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Electron-electron interactions in graphene bilayers
Fan Zhang, Hongki Min, Marco Polini +1
Electrons most often organize into Fermi-liquid states in which electron-electron interactions play an inessential role. A well known exception is the case of one-dimensional (1D)…
Linear response of doped graphene sheets to vector potentials
A. Principi, Marco Polini, G. Vignale
A two-dimensional gas of massless Dirac fermions (MDFs) is a very useful model to describe low-energy electrons in monolayer graphene. Because the MDF current operator is directly…
Dynamical response functions and collective modes of bilayer graphene
Giovanni Borghi, Marco Polini, Reza Asgari +1
Bilayer graphene (BLG) has recently attracted a great deal of attention because of its electrically tunable energy gaps and its unusual electronic structure. In this Letter we pres…
Fermi Velocity Enhancement in Monolayer and Bilayer Graphene
Giovanni Borghi, Marco Polini, Reza Asgari +1
In single-layer graphene sheets non-local interband exchange leads to a renormalized Fermi-surface effective mass which vanishes in the low carrier-density limit. We report on a co…
Drude weight, plasmon dispersion, and pseudospin response in doped graphene sheets
Marco Polini, A. H. MacDonald, G. Vignale
Plasmons in ordinary electron liquids are collective excitations whose long-wavelength limit is rigid center-of-mass motion with a dispersion relation that is, as a consequence of…