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Article overview
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Short-range excitonic phenomena in low-density metals | | Jaakko Koskelo
; Lucia Reining
; Matteo Gatti
; | | Date: |
1 Jan 2023 | | Abstract: | Excitonic effects in metals are commonly supposed to be weak, because the
Coulomb interaction is strongly screened. We investigate the low-density regime
of the homogeneous electron gas, where low-energy collective excitations and
ghost modes were anticipated. Using the Bethe-Salpeter equation (BSE), we show
that both phenomena exist thanks to reduced screening at short distances. This
is not captured by common approximations used in ab initio BSE calculations,
but requires vertex corrections that take the fermionic nature of charges into
account. The electron-hole wavefunction of the low-energy modes shows strong
and very anisotropic electron-hole correlation, which speaks for an excitonic
character of these modes. The fact that short-range physics is at the origin of
these phenomena explains why, on the other hand, also the simple adiabatic
local density approximation to time-dependent density functional theory can
capture these effects. | | Source: | arXiv, 2301.00474 | | Services: | Forum | Review | PDF | Favorites | |
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