Excitonic Superfluid to pseudo-spin density wave transition in bilayer quantum Hall systems

Details Excitonic Superfluid to pseudo-spin density wave transition in bilayer quantum Hall systems Excitonic Superfluid to pseudo-spin density wave transition in bilayer quantum Hall systems

2006-06-26

arxiv.org/abs/cond-mat/0606639v6

Phys. Rev. Lett. 98, 236802 (2007).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

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

Scientific paper

We construct a quantum Ginsburg-Landau theory to study the quantum phase transition from the excitonic superfluid (ESF) to a possible pseudo-spin density wave (PSDW) at some intermediate distances driven by the magneto-roton minimum collapsing at a finite wavevector. We analyze the properties of the PSDW and explicitly show that a square lattice is the favorite lattice. We suggest that correlated hopping of vacancies in the active and passive layers in the PSDW state leads to very large and temperature dependent drag consistent with the experimental data. Comparisons with previous microscopic numerical calculations are made. Further experimental implications are given.

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