A controlled separation of the Coulomb interaction yields a scalar macroscopic dielectric function for 2D materials, letting plasmons and excitons be identified by zero crossings of its real part and screening lengths be extracted from first principles.
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Separation between long- and short-range part of the Coulomb interaction in low dimensional systems: implications for the macroscopic screening length and the collective charge excitations
A controlled separation of the Coulomb interaction yields a scalar macroscopic dielectric function for 2D materials, letting plasmons and excitons be identified by zero crossings of its real part and screening lengths be extracted from first principles.