Adiabatic quantum pumping of a desired ratio of spin current to charge current

Sungjun Kim, Kunal K. Das, Ari Mizel

Published 2005-07-12, updated 2006-01-11Version 2

We present a prescription for generating pure spin current or spin selective current, based on adiabatic quantum pumping in a tight-binding model of a one dimensional conductor. A formula for the instantaneous pumped current is derived without introducing the scattering matrix. Our calculations indicate that some pumping cycles produce the maximum value 2 of pumped spin while others reverse the direction of current as a result of small alterations of the pumping cycle. We find pumping cycles which produce essentially any ratio of spin current to charge current.