8 papers
Measuring the condensate fraction of rapidly rotating trapped boson systems: off-diagonal order from the density
Jairo Sinova, C. B. Hanna, A. H. MacDonald
We demonstrate a direct connection between the density profile of a system of ultra-cold trapped bosonic particles in the rapid-rotation limit and its condensate fraction. This con…
Rippled state of double-layer quantum Hall systems
C. B. Hanna
The incommensurate phase of a bilayer quantum Hall state is found to have a ``rippled'' dipole charge density whenever the layers are unbalanced. This tunable dipole-density-wave i…
Quantum Melting and Absence of Bose-Einstein Condensation in Two-Dimensional Vortex Matter
Jairo Sinova, C. B. Hanna, A. H. MacDonald
We demonstrate that quantum fluctuations suppress Bose-Einstein condensation of quasi-two-dimensional bosons in a rapidly-rotating trap. Our conclusions rest in part on an effectiv…
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…
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…
Double-Layer Systems at Zero Magnetic Field
C. B. Hanna, Dylan Haas, J. C. Diaz-Velez
We investigate theoretically the effects of intralayer and interlayer exchange in biased double-layer electron and hole systems, in the absence of a magnetic field. We use a variat…