IFLP   13074
INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
Competition between Pomeranchuk instabilities in the nematic and hexatic channels in a two-dimensional spinless Fermi-fluid
Autor/es:
DANIEL G. BARCI; MARTA L. TROBO; VICTORIA FERNÁNDEZ; LUIS E. OXMAN
Revista:
PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS
Editorial:
American Physical Society
Referencias:
Año: 2008 vol. 78 p. 351141 - 351147
ISSN:
0163-1829
Resumen:
We study a two-dimensional spinless Fermi fluid near Pomeranchuk instabilities in the nematic and hexatic channels. We show that the general phase diagram of this theory contains two sec- ond order lines, corresponding to continuous isotropic/nematic and isotropic/hexatic phase tran- sitions. In addition, the nematic/hexatic transition is a discontinuous first order one, defining a bi-critical point in the Landau parameter space. We carefully study the phase diagram for the isotropic/nematic/hexatic quantum phase transition evaluating in particular the dynamics of the collective modes that could be observed in scattering experiments. We found that at criticality, and deep inside the associated symmetry broken phases, the low energy theory is governed by a dissipative cubic mode. That means that the critical theory, valid in a huge region of the phase diagram is dominated by a dynamical critical exponent z = 3. This implies that both phases, ne- matic and hexatic, are non-Fermi liquids with different residual symmetries (however with the same asymptotic behavior) separated discontinuously by a first order transition. matic and hexatic, are non-Fermi liquids with different residual symmetries (however with the same asymptotic behavior) separated discontinuously by a first order transition. matic and hexatic, are non-Fermi liquids with different residual symmetries (however with the same asymptotic behavior) separated discontinuously by a first order transition. matic and hexatic, are non-Fermi liquids with different residual symmetries (however with the same asymptotic behavior) separated discontinuously by a first order transition. matic and hexatic, are non-Fermi liquids with different residual symmetries (however with the same asymptotic behavior) separated discontinuously by a first order transition. z = 3. This implies that both phases, ne- matic and hexatic, are non-Fermi liquids with different residual symmetries (however with the same asymptotic behavior) separated discontinuously by a first order transition.