Kondo effect in transport through Aharonov-Bohm and Aharonov-Casher interferometers

A.M. LOBOS AND A.A. ALIGIA

PHYSICA B - CONDENSED MATTER

ELSEVIER SCIENCE BV

Año: 2009 vol. 404 p. 3306 - 3311

0921-4526

We derive the extension of the Hubbard model to include Rashba spin-orbit coupling that correctly describes Aharonov-Bohm and Aharonov-Casher phases in a ring under applied magnetic and electric fields.  When the ring is connected to conducting leads, we develop a formalism that is able to describe both, Kondo and interference effects. We find that in the Kondo regime, the spin-orbit coupling reduces strongly the conductance from the unitarylimit. This effect in combination with the magnetic flux, can be used to produce spin polarized carriers.