Adaptive Lanczos-vector method for dynamic properties within the density matrix renormalization group
2011 | journal article. A publication with affiliation to the University of Göttingen.
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Adaptive Lanczos-vector method for dynamic properties within the density matrix renormalization group
Dargel, P. E.; Honecker, A.; Peters, R.; Noack, R. M. & Pruschke, T. (2011)
PHYSICAL REVIEW B, 83(16) art. 161104. DOI: https://doi.org/10.1103/PhysRevB.83.161104
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Details
- Authors
- Dargel, Piet E.; Honecker, Andreas; Peters, Robert; Noack, R. M.; Pruschke, T.
- Abstract
- Current widely used approaches to calculate spectral functions using the density-matrix renormalization group in frequency space either necessarily include an artificial broadening (correction-vector method), have limited resolution (time-domain density-matrix renormalization group with Fourier transform method), or are limited to low-energy properties or single dominant modes (original continued fraction method). Here we propose an adaptive Lanczos-vector method to calculate the coefficients of a continued fraction expansion of the spectral function iteratively. We show that one can obtain a very accurate representation of the spectral function very efficiently, and that one can also directly extract the spectral weights and poles for the discrete system.
- Issue Date
- 2011
- Status
- published
- Publisher
- Amer Physical Soc
- Journal
- PHYSICAL REVIEW B
- ISSN
- 1098-0121
- Sponsor
- DFG [SFB 602]; JSPS; AvH; [HO 2325/4-2]