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Adaptively truncated Hilbert space based impurity solver for dynamical mean-field theory

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Title
Adaptively truncated Hilbert space based impurity solver for dynamical mean-field theory
Author(s)
Ara Go; Andrew J. Millis
Publication Date
2017-08
Journal
PHYSICAL REVIEW B, v.96, no.8, pp.085139 -
Publisher
AMER PHYSICAL SOC
Abstract
We present an impurity solver based on adaptively truncated Hilbert spaces. The solver is particularly suitable for dynamical mean-field theory in circumstances where quantum Monte Carlo approaches are ineffective. It exploits the sparsity structure of quantum impurity models, in which the interactions couple only a small subset of the degrees of freedom. We further introduce an adaptive truncation of the particle or hole excited spaces, which enables computations of Green functions with an accuracy needed to avoid unphysical (sign change of imaginary part) self-energies. The method is benchmarked on the one-dimensional Hubbard model. © 2017 American Physical Society
URI
http://pr.ibs.re.kr/handle/8788114/3799
DOI
10.1103/PhysRevB.96.085139
ISSN
2469-9950
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
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