Landau versus Spin Superfluidity in Spinor Bose-Einstein Condensates

  title={Landau versus Spin Superfluidity in Spinor Bose-Einstein Condensates},
  author={Hugo Flayac and Hugo Terças and Dmitry D Solnyshkov and Guillaume Malpuech},
We consider a spin-1/2 Bose-Einstein condensate prepared initially in a single spin projection. The two channels of excitations existing in such a system (namely density and spin waves) are discussed and we show how pure spin waves can be excited in the presence of local magnetic defects. We analyze the role played by spin excitations on the Landau superfluidity criterion and demonstrate the absence of absolute superfluidity for the antiferromagnetic condensate. In the ferromagnetic case, we… CONTINUE READING

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