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Non-universal corrections to the level curvature distribution beyond random matrix theory | | I. V. Yurkevich
; V. E. Kravtsov
; | | Date: |
12 Sep 1996 | | Journal: | Phys.Rev.Lett., 78 (1997) 701. | | Subject: | cond-mat | | Abstract: | The level curvature distribution function is studied beyond the random matrix theory for the case of T-breaking perturbations over the orthogonal ensemble. The leading correction to the shape of the level curvature distribution is calculated using the nonlinear sigma-model. The sign of the correction depends on the presence or absence of the global gauge invariance and is different for perturbations caused by the constant vector-potential and by the random magnetic field. Scaling arguments are discussed that indicate on the qualitative difference in the level statistics in the dirty metal phase for space dimensionalities $d<4$ and $d>4$. | | Source: | arXiv, cond-mat/9609106 | | Services: | Forum | Review | PDF | Favorites | |
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