Persistent Spin Current in a Hard-Wall Confining Quantum Wire with Weak Dresselhaus Spin-Orbit Coupling

We investigate theoretically the spin current in a quantum wire with weak Dresselhaus spin-orbit couplingconnected to two normal conductors.Both the quantum wire and conductors are described by a hard-wall confiningpotential.Using the electron wave-functions in the quantum wire and a new definition of spin current,we have calculatedthe elements of linear spin current density j;and j;（i = χ,y,z）.We find that the elements j;and j;have aantisymmetrical relation and the element j;has the same amount level as j;and j;We also find a net,linearspin current density,which has peaks at the center of quantum wire.The net linear spin current can induce a linearelectric field,which may imply a way of spin current detection.