The effects of compressible and incompressible states on the   FIR-absorption of quantum wires and dots in a magnetic field
  We investigate the effects of compressible and incompressible states on the FIR-absorption of quantum wires and dots in a homogeneous perpendicular magnetic field. The electron-electron interaction is treated in the Hartree approximation at a finite low temperature. The calculated dispersion of the collective excitations reproduces several experimental results. 
Vidar Gudmundsson, Arne Brataas, Christoph Steinebach, A. G.   Mal'shukov, K. A. Chao, and Detlef Heitmann