External electric field mediated quantum phase transitions in one-dimensional charge-ordered insulators: a density matrix renormalization group study

Dutta, Sudipta ; Pati, Swapan K. (2008) External electric field mediated quantum phase transitions in one-dimensional charge-ordered insulators: a density matrix renormalization group study Journal of Physics: Condensed Matter, 20 (7). 075226_1-075226_6. ISSN 0953-8984

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Official URL: http://iopscience.iop.org/0953-8984/20/7/075226

Related URL: http://dx.doi.org/10.1088/0953-8984/20/7/075226

Abstract

We perform density matrix renormalization group 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 fields. 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 transitions at zero temperature. We also find the CDW-SDW phase transition on application of an external electric field. The bias required for the transitions in both cases decreases with increase in system size.

Item Type:Article
Source:Copyright of this article belongs to Institute of Physics.
ID Code:60795
Deposited On:12 Sep 2011 07:27
Last Modified:12 Sep 2011 07:27

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