https://doi.org/10.1140/epjb/s10051-024-00711-6
Regular Article - Solid State and Materials
Revisiting the Thomas–Fermi potential for three-dimensional condensed matter systems
1
Departament de Física de la Matèria Condensada, Facultat de Física, Universitat de Barcelona, Carrer Martí i Franquès 1, 08028, Barcelona, Spain
2
Institut de Nanociència i Nanotecnologia, Universitat de Barcelona, Av. Joan XXIII S/N, 08028, Barcelona, Spain
a gionnimarchetti@ub.edu, gionnimarchetti@gmail.com
Received:
16
March
2024
Accepted:
24
May
2024
Published online:
21
June
2024
We proposed a formally exact, probabilistic method to assess the validity of the Thomas–Fermi potential for three-dimensional condensed matter systems where electron dynamics is constrained to the Fermi surface. Our method, which relies on accurate solutions of the radial Schrödinger equation, yields the probability density function for momentum transfer. This allows for the computation of its expectation values, which can be compared with unity to confirm the validity of the Thomas–Fermi approximation. We applied this method to three n-type direct-gap III–V model semiconductors (GaAs, InAs, InSb) and found that the Thomas–Fermi approximation is certainly valid at high electron densities. In these cases, the probability density function exhibits the same profile, irrespective of the material under scrutiny. Furthermore, we show that this approximation can lead to serious errors in the computation of observables when applied to GaAs at zero temperature for most electron densities under scrutiny.
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