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Quasi-Spin-Charge Separation and the Spin Quantum Hall Effect | | D.Bernard
; A. LeClair
; | | Date: |
6 Mar 2000 | | Journal: | Phys.Rev. B64 (2001) 045306 | | Subject: | Mesoscopic Systems and Quantum Hall Effect; Disordered Systems and Neural Networks | cond-mat.mes-hall cond-mat.dis-nn hep-th | | Abstract: | We use quantum field theory methods to study the network model for the spin quantum hall transition. When the couplings are fine tuned in a certain way, the spin and charge degrees of freedom, corresponding to the supercurrent algebras su(2) and osp(2|2) respectively, decouple in the renormalization group flow. The infrared fixed point of this simpler theory is the coset osp(4|4)/su(2) which is closely related to the current algebra osp(2|2) but not identical. Some critical exponents are computed and shown to agree with the recent predictions based on percolation. | | Source: | arXiv, cond-mat/0003075 | | Services: | Forum | Review | PDF | Favorites | |
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