Phys. Rev. Lett. 85, 5607–5610 (2000)Nonperturbative Saddle Point for the Effective Action of Disordered and Interacting Electrons in 2DReceived 22 June 2000; published in the issue dated 25 December 2000 We find a nonperturbative saddle-point solution for the nonlinear sigma model proposed by Finkelstein for interacting and disordered electronic systems. Spin rotation symmetry, present in the original saddle-point solution, is spontaneously broken at one loop, as in the Coleman-Weinberg mechanism. The new solution is singular in both the disorder and triplet interaction strengths, and it also explicitly demonstrates that a nontrivial ferromagnetic state appears in a theory where the disorder average is carried out from the outset. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.5607
DOI:
10.1103/PhysRevLett.85.5607
PACS:
71.10.Hf, 71.10.-w, 71.30.+h, 73.23.-b
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