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Semiclassical results in the linear response theory
Monique Combescure1, 2, Didier Robert3

We consider a quantum system of non-interacting fermions attemperature T, in the framework of linear response theory. We show that semiclassical theory is an appropriate framework to describe some of their thermodynamic properties, in particular through asymptotic expansions in $\hbar$ (Planck constant) of the dynamical susceptibilities. We show how the closed orbits of the classical motion in phase space manifest themselves in these expansions, in the regime where T is of the order of $\hbar$.
1 :  LPT - Laboratoire de Physique Théorique d'Orsay
2 :  IPNL - Institut de Physique Nucléaire de Lyon
3 :  LMJL - Laboratoire de Mathématiques Jean Leray
Mathématiques/Physique mathématique
linear response – semiclassical limit – trace formula – low temperature
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