Spintronics in nanostructures
Ulrich Zuelicke
u.zuelicke[at]massey.ac.nz
Institute of Fundamental Sciences, Massey University, Palmerston North, New Zealand
and
MacDiarmid Institute of Advanced Materials and Nanotechnology
Outline
Introduction
electron spin + electronics = spintronics (S. Wolf, 1996)
magnetoelectronics and its applications
Magnetoelectronics with new magnets
ferromagnetic semiconductors
organic spintronics
Spintronics from spin interference
spin-dependent electron interferometers
entanglement generation
Conclusions and Outlook
Linear optics & Quantum information
efficient quantum computing can be achieved using
linear photon optics (Knill, Laflamme & Milburn, Nature 2001)
photon = flying qubit in its polarisation degree of
freedom (Milburn, Phys. Rev. Lett. 1988)
need only single–photon source + photodetectors,
plus linear devices (beam splitters & phase shifters)
quantum mechanics: electrons are waves, too! ⇒ can we
realise flying qubits in electronic spin degree of freedom?
no efficient quantum computation possible with linear
fermion optics only (Terhal & DiVincenzo, Phys. Rev. A 2002)
charge detection enables quantum computation with
linear fermion optics (Beenakker et al., Phys. Rev. Lett. 2004)
Workshop on Quantum Materials, Heron Island Resort, Queensland, Australia, 1 – 4 June 2005 – p.13
Interference of electron waves
quantum optics: see interference fringes in intensity
Workshop on Quantum Materials, Heron Island Resort, Queensland, Australia, 1 – 4 June 2005 – p.14
Interference of electron waves
quantum optics: see interference fringes in intensity
phase–coherent electronics: conductance modulation
Workshop on Quantum Materials, Heron Island Resort, Queensland, Australia, 1 – 4 June 2005 – p.14
Interference of electron waves
quantum optics: see interference fringes in intensity
phase–coherent electronics: conductance modulation
celebrated examples: Aharonov–Bohm oscillations