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Parity law of the singlet-triplet gap in graphitic ribbons | | Mohamad Al Hajj
; Fabien Alet
; Sylvain Capponi
; Marie Bernadette Lepetit
; Jean-Paul Malrieu
; Synge Todo
; | | Date: |
13 Jan 2006 | | Subject: | Strongly Correlated Electrons; Superconductivity | | Abstract: | This work explores the possibility to transfer the parity law of the singlet-triplet gap established for square ladders (gapped for even number of legs, gapless for odd number of legs) to fused polyacenic 1-D systems, i.e., graphite ribbons. Qualitative arguments are presented in favor of a gapped character when the number $n\_{omega}$ of benzene rings along the ribbon width is odd. A series of numerical calculations (quantitative mapping on spin 1/2 chains, renormalized excitonic treatments and Quantum Monte Carlo) confirm the parity law and the gapless character of the ribbon for even $n\_{omega}$. | | Source: | arXiv, cond-mat/0601293 | | Services: | Forum | Review | PDF | Favorites | |
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