16 papers
Disorder and interactions in quantum Hall ferromagnets: effects of disorder in Skyrmion physics
Jairo Sinova, A. H. MacDonald, S. M. Girvin
We present a Hartree-Fock study of the competition between disorder and interactions in quantum Hall ferromagnets near . We find that the ground state at evolves with in…
Broken-Symmetry States in Quantum Hall Superlattices
C. B. Hanna, J. C. Diaz-Velez, A. H. MacDonald
We argue that broken-symmetry states with either spatially diagonal or spatially off-diagonal order are likely in the quantum Hall regime, for clean multiple quantum well (MQW) sys…
Tomonaga-Luttinger parameters for quantum wires
Wolfgang Häusler, Lars Kecke, A. H. MacDonald
The low-energy properties of a homogeneous one-dimensional electron system are completely specified by two Tomonaga-Luttinger parameters and . In this paper we discuss m…
Incommensurate ground state of double-layer quantum Hall systems
C. B. Hanna, A. H. MacDonald, S. M. Girvin
Double-layer quantum Hall systems possess interlayer phase coherence at sufficiently small layer separations, even without interlayer tunneling. When interlayer tunneling is presen…
Details of disorder matter in 2D d-wave superconductors
W. A. Atkinson, P. J. Hirschfeld, A. H. MacDonald +1
We demonstrate that discrepancies between predicted low-energy quasiparticle properties in disordered 2D d-wave superconductors occur because of the unanticipated importance of dis…
Reorientation of Anisotropy in a Square Well Quantum Hall Sample
W. Pan, T. Jungwirth, H. L. Stormer +7
We have measured magnetotransport at half-filled high Landau levels in a quantum well with two occupied electric subbands. We find resistivities that are {\em isotropic} in perpend…