Pressure, Resistance, and Current Activation of Anisotropic Compressible   Hall States
  Thermodynamic and electric properties of anisotropic compressible Hall states at higher Landau levels are studied using a mean field theory on the von Neumann lattice basis. It is shown that resistances agree with the recent experiments of anisotropic compressible states and the states have negative pressure. As implications, the collapse phenomena of the integer quantum Hall effect are discussed. 
K. Ishikawa and N. Maeda