2011年4月
Adaptive Lanczos-vector method for dynamic properties within the density matrix renormalization group
PHYSICAL REVIEW B
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- 巻
- 83
- 号
- 16
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevB.83.161104
- 出版者・発行元
- AMER PHYSICAL SOC
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.
- リンク情報
- ID情報
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- DOI : 10.1103/PhysRevB.83.161104
- ISSN : 1098-0121
- Web of Science ID : WOS:000290114400001