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Wave impedance of an atomically thin crystal
No full textI propose an expression for the electromagnetic wave impedance of a two-dimensional atomic crystal, and I deduce the Fresnel coefficients in terms of this quantity. It is widely known that a two-dimensional crystal can absorb light, if its conductivity is different from zero. It is less emphasized that they can also store a certain amount of electromagnetic energy. The concept of impedance is useful to quantify this point
Role of the Radiation-Reaction Electric Field in the Optical Response of Two-Dimensional Crystals
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Clausius-Mossotti Lorentz-Lorenz relations and retardation effects for two-dimensional crystals
No full textThe macroscopic surface electric susceptibility determines the linear optical properties of an insulating single-layer two-dimensional atomic crystal and can be expressed in terms of the microscopic polarizability of the atoms. We compute the local electric field acting on a single atom, for both the static and the dynamic case, as the superposition of the external applied electric field and the fields generated by the induced dipoles in the crystal. We find that, in the dynamic case, retardation effects dephase the local electric field with respect to the incident one. This explains why the Fresnel coefficients of a single-layer two-dimensional atomic crystal are intrinsically complex quantities, even when a null macroscopic surface conductivity is assumed
Spin dependent electron absorption in Fe(001)-p(1x1)O: A new candidate for a stable and efficient electron polarization analyzer
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