Spin current and rectification in one-dimensional electronic systems

TL;DR

This paper demonstrates that in a one-dimensional quantum wire with strong interactions, an ac voltage can generate significant spin currents that grow as voltage decreases, without needing spin-polarized injection or dynamic magnetic fields.

Contribution

It reveals a novel mechanism for generating large spin currents via ac voltage in strongly interacting 1D systems, independent of spin injection or time-dependent magnetic fields.

Findings

Spin current can grow as a negative power of voltage at low biases.

Spin current can surpass charge current in magnitude.

The mechanism does not require spin-polarized injection or dynamic magnetic fields.

Abstract

Spin and charge currents can be generated by an ac voltage through a one-channel quantum wire with strong electron interactions in a static uniform magnetic field. In a certain range of low voltages, the spin current can grow as a negative power of the voltage bias as the voltage decreases. The spin current expressed in units of hbar/2 per second can become much larger than the charge current in units of the electron charge per second. The system requires neither spin-polarized particle injection nor time-dependent magnetic fields.