Macroscopic quantum tunnelling of magnetization in spinor Bose-Einstein condensates

Abstract

We investigate macroscopic quantum tunneling of magnetization in a a spinor Bose- Einstein condensate trapped in a double-well potential. Using the mean field theory applicable for large condensates, and employing the single spatial mode approximation we derive dynamical equations for magnetization, independent from density mode, for certain initial conditions. We show that they can be reduced to standard Josephson junction dynamics equations under certain conditions.