Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 20, Issue 32, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/20/32/325235
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Superfluid properties of electron-hole pairs in a quantum Hall four-layer system are investigated. The system is considered as a solid-state realization of a two-component superfluid Bose gas with dipole-dipole interaction. One superfluid component is formed in the top bilayer and the other component-in the bottom one. We obtain the dispersion equation for the collective mode spectrum and compute the critical parameters ( the critical interlayer distance and the critical currents) versus the filling factor. We find that the critical currents of the components depend on each other. The maximum critical current of a given component can be reached if the current of the other component is equal to zero. The non-dissipative drag effect between the components is studied. It is shown that in the system considered the drag factor is very large. Under appropriate conditions it can be about 10%, which is at least three orders of magnitude larger than one predicted for two-component atomic Bose gases.
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