Abstract
We first review the necessary components of electrodynamics and establish a practical notion of optical excitations. Next, we specialize to plasmonic excitations, and discuss their classical features. Finally, we cover theoretical aspects of techniques that probe the properties of plasmons in practice.
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Notes
- 1.
- 2.
All vectorial quantities in this chapter are implicitly in-plane, i.e. two-dimensional; in Chap. 5 we introduce additional notation to distinguish vectors of different dimensionality.
- 3.
The \(\mathbf {M}\)-point coincides with a van Hove singularity; its importance, however, is minor for our low-energy considerations.
- 4.
Different values of the hopping parameter proliferate: we adopt the value of the prevailing theoretical review [8].
- 5.
Jointly, these properties earn graphene the classification of ‘semi-metal’.
- 6.
We mention one minor modification, namely the opening of a very small bandgap \(\sim \! 1\ \mu \,\text {eV}\) when spin-orbit interaction is included [23].
- 7.
Though we here make a distinction between \( \mathbf {k} \) and \( \mathbf {q} \), we will generally prefer the Dirac perspective; accordingly, both \( \mathbf {k} \) and \( \mathbf {q} \) are henceforth implicitly measured relative to a Dirac point.
- 8.
We warn in advance, that the Dirac equation studied in Sect. 6.2.3 does not follow directly from our present considerations, corresponding instead to a rotated and reflected lattice, preferred for reasons of algebraic simplicity.
- 9.
Six Dirac points reside on the boundary of the FBZ, each including a third of their vicinity inside the FBZ: thus, the valley degeneracy sums to \(6\times \tfrac{1}{3}=2\).
- 10.
Even for thin-films, e.g. a \(10\times 10\times 0.3 \,\text {nm}^3\) gold film, one requires \(\sim \!50\) electrons for a \(0.1 \,\text {eV}\) Fermi energy shift.
- 11.
Throughout this section we assume \( {\epsilon } _{\textsc {f}} >0\); hole-doped equivalents follow by replacing \( {\epsilon } _{\textsc {f}} \rightarrow | {\epsilon } _{\textsc {f}} |\).
- 12.
Mermin’s critical insight was the observation that scattering incurs relaxation not to a global equilibrium but to a local equilibrium which accounts for the influence of a nonzero perturbing field.
- 13.
The link ignores retardation effects since \(\chi ^0(q,\omega )\) is a nonretarded construct; as a consequence it does not distinguish between transverse and longitudinal perturbations.
- 14.
The intraband term’s small temperature dependence can be appreciated from the \(x=T_{\textsc {f}}/T\ll 1\) expansion \(\ln (2\cosh \tfrac{1}{2}x)\simeq \tfrac{1}{2}x + \mathrm {e}^{-x} +\ldots \), revealing [when comparing with Eq. (4.11a)] that the finite-temperature corrections to Eq. (4.12a) are exponentially damped.
- 15.
The relation is obtained by comparing the dc-conductivity definition of the mobility, \(\sigma =n_0 e\mu _{\scriptscriptstyle \text {e}} \), with the low-frequency intraband Drude conductivity \(\sigma (\omega \rightarrow 0) = e^2 {\epsilon } _{\textsc {f}} /\pi \hbar ^2\gamma \).
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Christensen, T. (2017). Electronic Properties of Graphene. In: From Classical to Quantum Plasmonics in Three and Two Dimensions. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-48562-1_4
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