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Dissipationless Spin Transport in Thin Film Ferromagnets
Jürgen König, Martin Chr. Bønsager, Allan H. MacDonald
Metallic thin film ferromagnets generically possess spiral states that carry dissipationless spin currents. We relate the critical values of these supercurrents to micromagnetic ma…
Theory of Ferromagnetism in Diluted Magnetic Semiconductors
Jürgen König, Hsiu-Hau Lin, Allan H. MacDonald
Carrier-induced ferromagnetism has been observed in several (III,Mn)V semiconductors. We review the theoretical picture of these ferromagnetic semiconductors that emerges from a mo…
Theory of Tunneling Spectroscopy in Ferromagnetic Nanoparticles
C. M. Canali, A. H. MacDonald
We present a theory of the low-energy excitations of a ferromagnetic metal nanoparticle. In addition to the particle-hole excitations, which occur in a paramagnetic metal nanoparti…
Extensive eigenvalues in spin-spin correlations: a tool for counting pure states in Ising spin glasses
Jairo Sinova, Geoff Canright, Horacio E. Castillo +1
We study the nature of the broken ergodicity in the low temperature phase of Ising spin glass systems, using as a diagnostic tool the spectrum of eigenvalues of the spin-spin corre…
Limits on the Curie temperature of (III,Mn)V ferromagnetic semiconductors
John Schliemann, Jürgen König, Hsiu-Hau Lin +1
Mean-field-theory predicts that the Curie temperature T_c of a (III,Mn)V ferromagnet will be proportional to the valence band density-of-states of its host (III,V) semiconductor, s…
Reply to Comment of Yang, Sun, and Chang on "Theory of Diluted Magnetic Semiconductor Ferromagnetism"
Jürgen König, Hsiu-Hau Lin, Allan H. MacDonald
We reply to the comment cond-mat/0008098 by Yang, Sun, and Chang on our paper "Theory of Diluted Magnetic Semiconductor Ferromagnetism", Phys. Rev. Lett. 84, 5628 (2000).
Double-Occupancy Errors, Adiabaticity, and Entanglement of Spin-Qubits in Quantum Dots
John Schliemann, Daniel Loss, A. H. MacDonald
Quantum gates that temporarily increase singlet-triplet splitting in order to swap electronic spins in coupled quantum dots, lead inevitably to a finite double-occupancy probabilit…
Theory of Magnetic Anisotropy in III_{1-x}Mn_{x}V Ferromagnets
M. Abolfath, T. Jungwirth, J. Brum +1
We present a theory of magnetic anisotropy in diluted magnetic semiconductors with carrier-induced ferromagnetism. The theory is based on four…
Spin and Charge Luttinger-Liquid Parameters of the One-Dimensional Electron Gas
C. E. Creffield, Wolfgang Häusler, A. H. MacDonald
Low-energy properties of the homogeneous electron gas in one dimension are completely described by the group velocities of its charge (plasmon) and spin collective excitations. Bec…
Disorder and interactions in quantum Hall ferromagnets near
Jairo Sinova, A. H. MacDonald, S. M. Girvin
We report on a finite-size Hartree-Fock study of the competition between disorder and interactions in a two-dimensional electron gas near Landau level filling factor . The gro…
Inhomogeneous order-parameter suppression in disordered d-wave superconductors
W. A. Atkinson, P. J. Hirschfeld, A. H. MacDonald
We report on a numerical study of disorder effects in 2D d-wave BCS superconductors. We compare exact numerical solutions of the Bogoliubov-deGennes (BdG) equations for the density…
Theory of Ferromagnetism in Diluted Magnetic Semiconductor Quantum Wells
Byounghak Lee, T. Jungwirth, A. H. MacDonald
We present a mean field theory of ferromagnetism in diluted magnetic semiconductor quantum wells. When subband mixing due to exchange interactions between quantum well free carrier…
Non-linear Transport in Quantum-Hall Smectics
A. H. MacDonald, Matthew P. A. Fisher
Recent transport experiments have established that two-dimensional electron systems with high-index partial Landau level filling, , have ground states w…