Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2003-06-20
Int. J. Mod. Phys. B 17, 5875 (2003)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
9 pages, Revtex4
Scientific paper
10.1142/S0217979203023446
A unified description of elementary and collective excitations in quantum Hall systems is presented within the single-mode approximation (SMA) framework, with emphasis on revealing an intimate link with Chern-Simons theories. It is shown that for a wide class of quantum Hall systems the SMA in general yields, as an effective theory, a variant of the bosonic Chern-Simons theory. For single-layer systems the effective theory agrees with the standard Chern-Simons theory at long wavelengths whereas substantial deviations arise for collective excitations in bilayer systems. It is suggested, in particular, that Hall-drag experiments would be a good place to detect out-of-phase collective excitations inherent to bilayer systems. It is also shown that the intra-Landau-level modes bear a similarity in structure (though not in scale) to the inter-Landau-level modes, and its implications on the composite-fermion and composite-boson theories are discussed.
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