INVESTIGADORES
STURLA Mauricio Bernardo
artículos
Título:
Low energy electron-phonon effective action from symmetry analysis
Autor/es:
D.C. CABRA; N.E. GRANDI; G.A. SILVA; M.B. STURLA
Revista:
PHYSICAL REVIEW B
Editorial:
AMER PHYSICAL SOC
Referencias:
Lugar: New York; Año: 2013 p. 45126 - 45143
ISSN:
1098-0121
Resumen:
Based on a detailed symmetry analysis, we state the general rules to
build up the effective low-energy field theory describing a system of
electrons weakly interacting with the lattice degrees of freedom. The
basic elements in our construction are what we call the ?memory
tensors,? which keep track of the microscopic discrete symmetries into
the coarse-grained action. The present approach can be applied to
lattice systems in arbitrary dimensions and in a systematic way to any
desired order in derivatives. We apply the method to the honeycomb
lattice and reobtain the by-now well-known effective action of Dirac
fermions coupled to fictitious gauge fields. As a second example, we
derive the effective action for electrons in the kagome lattice, where
our approach allows us to obtain in a simple way the low-energy
electron-phonon coupling terms.