Grand canonical finite-size numerical approaches: A route to measuring bulk properties in an applied field

Chisa Hotta, Naokazu Shibata

研究成果: Article査読

19 被引用数 (Scopus)

抄録

We exploit a prescription to observe directly the physical properties of the thermodynamic limit in a continuously applied field in one-dimensional quantum finite lattice systems. By systematically scaling down the energy of the Hamiltonian of the open system from center toward both ends, one could adopt the edge sites with a negligibly small energy scale as the grand canonical small particle bath, and equilibrium states with noninteger arbitrary conserved numbers, e.g., electron numbers or s z, are realized in the main part of the system. This will enable the evaluation of response functions under a continuously varying external field in a small lattice without any fine-tuning or scaling of parameters while keeping the standard numerical accuracy. Demonstrations are given on quantum spin systems and on a Hubbard model by the density-matrix renormalization group.

本文言語English
論文番号041108
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
86
4
DOI
出版ステータスPublished - 2012 7 24

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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