FYRIRLESTRAMARAÞON HR 2011 | RU LECTURE MARATHON 2011 Andrei Manolescu School of Science and Engineering Spin currents in quantum rings.

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Presentation transcript:

FYRIRLESTRAMARAÞON HR 2011 | RU LECTURE MARATHON 2011 Andrei Manolescu School of Science and Engineering Spin currents in quantum rings

WHAT IS SPIN e The electron rotates around the nucleus  orbit The electron rotates around itself  spin  magnetic dipole e

WHAT IS SPIN-ORBIT INTERACTION The motion seen from the lab frame: The electron rotates around the nucleus e e The motion seen by the electron: The nucleus rotates around the electron and creates a magnetic field In atoms In crystals e

WHAT IS SPINTRONICS The electron has electric charge  electric current  Electronics: information carried by electric signals The electron has spin  magnetic (spin) current  Spintronics: information carried by magnetic signals The spin-orbit interaction allows the influence of electric fields on spin currents

GaAs/AlGaAs heterostructure Quantum ring Quantum wires NANOELECTRONIC DEVICES

TYPES OF SPIN-ORBIT INTERACTION IN NANOSTRUCTURES Rashba: due to the electric field of the vertical confinement Dresselhaus: due to the electric field of the crystal

Charge current Spin current M. Niţă, D.C. Marinescu, A. Manolescu, V. Guðmundsson, Phys. Rev. B 2011 SPIN CURRENTS INDUCED IN NANORINGS 00 Ring exposed to two dipolar electric fields with a relative angle  0

SPIN INTERFERRENCE WITH R+D SOI

THE NANOPHYSICS GROUP AT RU Kristinn Torfason Sigurdur ErlingssonHalldor SvavarssonAgust Valfells Gunnar Thorgilsson Andrei Manolescu Anton Heidar Thorolfsson Csaba Daday