科研之友
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摘要
We study the superfluidity of a pure spin current, which is a spin current without a mass current. We examine two types of pure spin currents, planar and circular, in a spin-1 Bose gas. For the planar current, it is usually unstable but can be stabilized by the quadratic Zeeman effect. The circular current can be generatedwith spin-orbit coupling. When the spin-orbit coupling strength is weak, we find that the circular pure spin current is the ground state of the system and thus a superflow. We discuss the experimental schemes to realize and detect a pure spin current.
