Fractional charges and quantum phase transitions in imbalanced bilayer quantum Hall systems

Details Fractional charges and quantum phase transitions in imbalanced bilayer quantum Hall systems Fractional charges and quantum phase transitions in imbalanced bilayer quantum Hall systems

2004-07-04

arxiv.org/abs/cond-mat/0407088v10

Phys. Rev. Lett. 97, 236803 (2006).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4+ pages, 2 figures. 1 table, Final version to appear in Phys. Rev. Lett

Scientific paper

We extend the Composite Boson theory to study slightly im-balanced bi-layer Quantum Hall systems. In the global $ U(1) $ symmetry breaking excitonic superfluid side, as the imbalance increases, the system supports continuously changing fractional charges. In the translational symmetry breaking pseudo-spin density wave (PSDW) side, there are two quantum phase transitions from the commensurate PSDW to an in-commensurate PSDW and then to the excitonic superfluid state. We compare our theory with experimental data and also the previous microscopic calculations.

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