科研之友
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摘要
We study an effect of interaction in the Hubbard model with the so-called Dirac dispersion on the concept of the Landau Fermi liquid. Using perturbation theory up to the second order, we calculate the interaction function f(sigma sigma')(chi), the interaction amplitude between the quasi-particles of the state (k(F), sigma) and (k(F)', sigma') (chi being an angle between k(F) and k(F)'). We find that f(up down arrow)(chi) contains the delta-function term delta(chi), which may gives rise of new aspects of interacting Dirac electrons.
- 出版日期2012-12
