Successes and failures of Bethe Ansatz Density Functional Theory

Details Successes and failures of Bethe Ansatz Density Functional Theory Successes and failures of Bethe Ansatz Density Functional Theory

2008-02-18

arxiv.org/abs/0802.2490v1

Phys. Rev. B 78, 165102 (2008).

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.78.165102

The response of a one-dimensional fermion system is investigated using Density Functional Theory (DFT) within the Local Density Approximation (LDA), and compared with exact results. It is shown that DFT-LDA reproduces surprisingly well some of the characteristic features of the Luttinger liquid, namely the vanishing spectral weight of low energy particle-hole excitations, as well as the dispersion of the collective charge excitations. On the other hand, the approximation fails, even qualitatively, for quantities for which backscattering is important, i.e., those quantities which are crucial for an accurate description of transport. In particular, the Drude weight in the presence of a single impurity is discussed.

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