Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-09-02
Phys. Rev. B 67, 205108 (2003)
Physics
Condensed Matter
Strongly Correlated Electrons
RevTeX4, 9 pages, 2 eps figures, Final version as appeared in Phys.Rev. B
Scientific paper
10.1103/PhysRevB.67.205108
Using the bosonization approach we study fermionic systems with a nonlinear dispersion relation in dimension d>2. We explicitly show how the band curvature gives rise to interaction terms in the bosonic version of the model. Although these terms are perturbatively irrelevant in relation to the Landau Fermi liquid fixed point, they become relevant perturbations when instabilities take place. Using a coherent state path integral technique we built up the effective action that governs the dynamics of the Fermi surface fluctuations. We consider the combined effect of fermionic interactions and band curvature on possible anisotropic phases triggered by negative Landau parameters. In particular we study in some detail the phase diagram for the isotropic/nematic/hexatic quantum phase transition.
Barci Daniel G.
Oxman Luis E.
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