Density matrix renormalization group for a highly degenerate quantum system: Sliding environment block approach
| Autor: | Peter Schmitteckert |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Strongly Correlated Electrons (cond-mat.str-el) Density matrix renormalization group Degenerate energy levels FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Spin chain Condensed Matter - Strongly Correlated Electrons Lattice (order) 0103 physical sciences Quantum system Statistical physics 010306 general physics 0210 nano-technology Ground state |
| DOI: | 10.48550/arxiv.1801.06100 |
| Popis: | We present an infinite lattice DMRG sweeping procedure which can be used as a replacement for the standard infinite lattice blocking schemes. Although the scheme is generally applicable to any system, its main advantages are the correct representation of commensurability issues and the treatment of degenerate systems. As an example we apply the method to a spin chain featuring a highly degenerate ground state space where the new sweeping scheme provides an increase in performance as well as accuracy by many orders of magnitude compared to a recently published work. Comment: 5 pages, 4 figures |
| Databáze: | OpenAIRE |
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