Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-01-02
J. Phys.: Condens. Matter 20, 075226 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 7 figures, accepted in J. Phys.: Condens. Matter
Scientific paper
10.1088/0953-8984/20/7/075226
We perform density matrix renormalization group (DMRG) calculations extensively on one-dimensional chains with on site (U) as well as nearest neighbour (V) Coulomb repulsions. The calculations are carried out in full parameter space with explicit inclusion of the static bias and we compare the nature of spin density wave (SDW) and charge density wave (CDW) insulators under the influence of external electric field. We find that, although the SDW (U>2V) and CDW (U<2V) insulators enter into a conducting state after a certain threshold bias, CDW insulators require much higher bias than the SDW insulators for insulator-metal transition at zero temperature. We also find the CDW-SDW phase transition on application of external electric field. The bias required for the transitions in both cases decreases with increase in system size.
Dutta Sudipta
Pati Swapan K.
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