Local representation of the electronic dielectric response function
- Brookhaven National Lab. (BNL), Upton, NY (United States)
We present a local representation of the electronic dielectric response function, based on a spatial partition of the dielectric response into contributions from each occupied Wannier orbital using a generalized density functional perturbation theory. This procedure is fully ab initio, and therefore allows us to rigorously define local metrics, such as “bond polarizability,” on Wannier centers. We show that the locality of the bare response function is determined by the locality of three quantities: Wannier functions of the occupied manifold, the density matrix, and the Hamiltonian matrix. Furthermore, in systems with a gap, the bare dielectric response is exponentially localized, which supports the physical picture of the dielectric response function as a collection of interacting local responses that can be captured by a tight-binding model.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC00112704; SC0012704; AC02-05CH11231
- OSTI ID:
- 1235871
- Alternate ID(s):
- OSTI ID: 1228805
- Report Number(s):
- BNL-111669-2015-JA; PRBMDO; R&D Project: 16068; KC0403020
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 24; ISSN 1098-0121
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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