Spectral functions of the half-filled one-dimensional Hubbard chain within the exchange-correlation potential formalism
(2022) In Physical Review B 106(4).- Abstract
- The spectral functions of the one-band half-filled one-dimensional Hubbard chain are calculated using the exchange-correlation potential formalism developed recently. The exchange-correlation potential is adopted from the exact potential derived from the Hubbard dimer. Within an approximation in which the full Green's function is replaced by a noninteracting one, the spectral functions can be calculated analytically. Despite the simplicity of the approximation, the resulting spectra are in favorable agreement with the more accurate results obtained from the dynamic density-matrix renormalization group method. In particular, the analytically calculated band gap as a function of U is in close agreement with the exact gap... (More)
- The spectral functions of the one-band half-filled one-dimensional Hubbard chain are calculated using the exchange-correlation potential formalism developed recently. The exchange-correlation potential is adopted from the exact potential derived from the Hubbard dimer. Within an approximation in which the full Green's function is replaced by a noninteracting one, the spectral functions can be calculated analytically. Despite the simplicity of the approximation, the resulting spectra are in favorable agreement with the more accurate results obtained from the dynamic density-matrix renormalization group method. In particular, the analytically calculated band gap as a function of U is in close agreement with the exact gap obtained from the Bethe ansatz. In addition, the formal general solution to the equation of motion of the Green's function is presented, and the difference between the traditional self-energy approach and the exchange-correlation potential formalism is also discussed and elaborated. A simplified Holstein Hamiltonian is considered to further illustrate the general form of the exchange-correlation potential. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/eac3a61c-bbfa-4f92-b08a-f41be67c7045
- author
- Aryasetiawan, F. LU and Sjöstrand, T. LU
- organization
- publishing date
- 2022-07-19
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review B
- volume
- 106
- issue
- 4
- article number
- 045123
- pages
- 10 pages
- publisher
- American Physical Society
- external identifiers
-
- scopus:85135706025
- ISSN
- 2469-9950
- DOI
- 10.1103/PhysRevB.106.045123
- language
- English
- LU publication?
- yes
- id
- eac3a61c-bbfa-4f92-b08a-f41be67c7045
- date added to LUP
- 2022-08-10 15:01:10
- date last changed
- 2022-09-09 14:20:08
@article{eac3a61c-bbfa-4f92-b08a-f41be67c7045,
abstract = {{The spectral functions of the one-band half-filled one-dimensional Hubbard chain are calculated using the exchange-correlation potential formalism developed recently. The exchange-correlation potential is adopted from the exact potential derived from the Hubbard dimer. Within an approximation in which the full Green's function is replaced by a noninteracting one, the spectral functions can be calculated analytically. Despite the simplicity of the approximation, the resulting spectra are in favorable agreement with the more accurate results obtained from the dynamic density-matrix renormalization group method. In particular, the analytically calculated band gap as a function of <b><i>U</i></b> is in close agreement with the exact gap obtained from the Bethe ansatz. In addition, the formal general solution to the equation of motion of the Green's function is presented, and the difference between the traditional self-energy approach and the exchange-correlation potential formalism is also discussed and elaborated. A simplified Holstein Hamiltonian is considered to further illustrate the general form of the exchange-correlation potential.}},
author = {{Aryasetiawan, F. and Sjöstrand, T.}},
issn = {{2469-9950}},
language = {{eng}},
month = {{07}},
number = {{4}},
publisher = {{American Physical Society}},
series = {{Physical Review B}},
title = {{Spectral functions of the half-filled one-dimensional Hubbard chain within the exchange-correlation potential formalism}},
url = {{http://dx.doi.org/10.1103/PhysRevB.106.045123}},
doi = {{10.1103/PhysRevB.106.045123}},
volume = {{106}},
year = {{2022}},
}