Compressibility of a quantum Hall system at $ν= 1/2$

Abstract

Despite the fact that composite fermions may be regarded as electrically neutral objects at Landua-level filling factor $ν=1/2$, carrying only an electric dipole moment, we argue that the long-wavelength compressibility of the system is finite.

RevTeX, 2 pages, no figures. Submitted as a comment to cond-mat/9702098, by Shankar and Murthy