Comment on “Absence of Compressible Edge Channel Rings in Quantum Antidots”

A Comment on the Letter by I. Karakut et al., Phys. Rev. Lett. 87, 146801 (2001). The authors of the Letter offer a Reply.

Figure 1

The Landau level near the Fermi energy around an antidot with (a) a well-defined compressible region around the antidot, where all the compressible states are pinned within $k_{B}T$; (b) an incomplete compressible region, where its energy width is larger than $k_{B}T$, but the single-particle level spacing is smaller than or comparable to $k_{B}T$; (c) a steeply sloping potential, where a compressible region does not form and the level spacing is much larger than $k_{B}T$.