Seminarium Fizyki Materii Skondensowanej

The indistinguishability principle of quantum particles was introduced in physics by W. Natanson in 1911. Its most popular form used to this day has been proposed by P.A.M. Dirac in 1926 through the (anti)symmetry principle of the multiparticle wave function. The same is assumed for the quasiparticles emerging in interacting systems. Here I show that this principle may be violated in correlated systems, in which the effective quasiparticle mass may depend of its spin direction. This happens in the spin-polarized systems, where the indistinguishable particles of the unnpolarized state transform into distinguishable and subsuquently transform back to their undistinguishable correspondants upon reaching the magnetic saturation. General remarks concerning testing of this fundamental principle are planned.
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