Two Interacting Quasiparticles Above the Fermi Sea

  title={Two Interacting Quasiparticles Above the Fermi Sea},
  author={Philippe Jacquod and Dima L. Shepelyansky},
  journal={Physical Review Letters},
We study numerically the interaction and disorder effects for two quasiparticles in two and three dimensions. The dependence of the interaction-induced Breit-Wigner width on the excitation energy above the Fermi level, the disorder strength and the system size is determined. A regime is found where the width is practically independent of the excitation energy. The results allow to estimate the two quasiparticle mobility edge. 

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