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Coherently photo-induced ferromagnetism in diluted magnetic semiconductors
J. Fernández-Rossier, C. Piermarocchi, P. Chen +2
Ferromagnetism is predicted in undoped diluted magnetic semiconductors illuminated by intense sub-bandgap laser radiation . The mechanism for photo-induced ferromagnetism is cohere…
Orbital and spin contributions to the -tensors in metal nanoparticles
A. Cehovin, C. M. Canali, A. H. MacDonald
We present a theoretical study of the mesoscopic fluctuations of -tensors in a metal nanoparticle. The calculations were performed using a semi-realistic tight-binding model, wh…
Theory of spin waves in diluted-magnetic-semiconductor quantum wells
Diego Frustaglia, Jürgen König, Allan H. MacDonald
We present a theory of collective spin excitations in diluted-magnetic-semiconductor quantum wells in which local magnetic moments are coupled via a quasi-two-dimensional gas of el…
Anomalous Hall effect in paramagnetic two dimensional systems
Dimitrie Culcer, Allan MacDonald, Qian Niu
We investigate the possibility of observing the anomalous Hall effect (AHE) in two dimensional paramagnetic systems. We apply the semiclassical equations of motion to carriers in t…
Theory of Spin-Charge Coupled Transport in a Two-Dimensional Electron Gas with Rashba Spin-Orbit Interactions
A. A. Burkov, Alvaro S. Nunez, A. H. MacDonald
We use microscopic linear response theory to derive a set of equations that provide a complete description of coupled spin and charge diffusive transport in a two-dimensional elect…
Collective transport in bilayer quantum Hall systems
Anton A. Burkov, Yogesh N. Joglekar, Enrico Rossi +1
Filling factor incompressible states in ideal bilayer quantum Hall systems have spontaneous interlayer phase coherence and can be regarded either as easy-plane pseudospin fer…
Collective transport properties of bilayer-quantum-Hall excitonic condensates
Allan H. MacDonald, Anton A. Burkov, Yogesh N. Joglekar +1
Double-layer electron systems in the quantum Hall regime have excitonic condensate ground states when the layers are close together and the total Landau level filling factor is clo…
Noise spectroscopy and interlayer phase-coherence in bilayer quantum Hall systems
Yogesh N. Joglekar, Alexander V. Balatsky, Allan H. MacDonald
Bilayer quantum Hall systems develop strong interlayer phase-coherence when the distance between layers is comparable to the typical distance between electrons within a layer. The…
First Principles Calculation of Anomalous Hall Conductivity in Ferromagnetic bcc Fe
Yugui Yao, L. Kleinman, A. H. MacDonald +5
We perform a first principles calculation of the anomalous Hall effect in ferromagnetic bcc Fe. Our theory identifies an intrinsic contribution to the anomalous Hall conductivity a…
Universal Intrinsic Spin-Hall Effect
Jairo Sinova, Dimitrie Culcer, Q. Niu +3
We describe a new effect in semiconductor spintronics that leads to dissipationless spin-currents in paramagnetic spin-orbit coupled systems. We argue that in a high mobility two-d…
Tunneling exponents in realistic quantum wires using the mean field approximation
Wolfgang Häusler, A. H. MacDonald
It is demonstrated that the charge Tomonaga-Luttinger parameter of quantum wires can be estimated accurately using the Hartree-Fock approximation if carried out self consiste…
EPR and ferromagnetism in diluted magnetic semiconductor quantum wells
Jürgen König, Allan H. MacDonald
Motivated by recent measurements of electron paramagnetic resonance (EPR) spectra in modulation-doped CdMnTe quantum wells, [F.J. Teran {\it et al.}, Phys. Rev. Lett. {\bf 91}, 077…
Critical Currents of Ideal Quantum Hall Superfluids
M. Abolfath, A. H. MacDonald, L. Radzihovsky
Filling factor bilayer electron systems in the quantum Hall regime have an excitonic-condensate superfluid ground state when the layer separation is less than a critical…
Persistent Spin Currents in Helimagnets
Jan Heurich, Jürgen König, A. H. MacDonald
We demonstrate that weak external magnetic fields generate dissipationless spin currents in the ground state of systems with spiral magnetic order. Our conclusions are based on phe…
Elementary Excitations of Ferromagnetic Metal Nanoparticles
A. Cehovin, C. M. Canali, A. H. MacDonald
We present a theory of the elementary spin excitations in transition metal ferromagnet nanoparticles which achieves a unified and consistent quantum description of both collective…
Optical spin transfer in ferromagnetic semiconductors
J. Fernández-Rossier, Alvaro S. Núñez, M. Abolfath +1
Circularly polarized laser pulses that excite electron-hole pairs across the band gap of (III,Mn)V ferromagnetic semiconductors can be used to manipulate and to study collective ma…
Chern Numbers for Spin Models of Transition Metal Nanomagnets
C. M. Canali, A. Cehovin, A. H. MacDonald
We argue that ferromagnetic transition metal nanoparticles with fewer than approximately 100 atoms can be described by an effective Hamiltonian with a single giant spin degree of f…
Exact diagonalization study of domain structure in integer filling factor quantum Hall ferromagnets
E. H. Rezayi, T. Jungwirth, A. H. MacDonald +1
Opposite spin Landau levels in a quantum well can be brought into coincidence by tilting the magnetic field away from normal orientation. We demonstrate that the magnetotransport a…