We present a general picture of the exciton properties of layered materials in terms of the
excitations of their single-layer building blocks. To this end, we derive a model excitonic
Hamiltonian by drawing an analogy with molecular crystals, which are other prototypical van
der Waals materials. We employ this simplified model to analyze in detail the excitation
spectrum of hexagonal boron nitride (hBN) that we have obtained from the ab initio solution
of the many-body Bethe-Salpeter equation as a function of momentum. In this way, we …

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