Quantum imaging of spin states in optical lattices (2010)
Douglas, James, Burnett, Keith
We investigate imaging of the spatial spin distribution of atoms in optical lattices using non-resonant light scattering. We demonstrate how scattering spatially correlated light from the atoms can...
NEWS & VIEWS Atomic physics (2010)
Vortex structures have revealed a lot about the nature of three-dimensional Bose–Einstein condensates. They play an even bigger part in two-dimensional cold atomic gases and drive a fundamentally...
Strong correlations in quantum vortex nucleation of ultracold atomic gases (2009)
Nunnenkamp, Andreas, Rey, Ana Maria, Burnett, Keith
We review some recent developments in the theory of rotating atomic gases. These studies have thrown light on the process of nucleation of vortices in regimes where mean-field methods are inadequate....
Generation of macroscopic superposition states in ring superlattices (2007)
Nunnenkamp, Andreas, Rey, Ana Maria, Burnett, Keith
Ultracold bosons in rotating ring lattices have previously been shown to form macroscopic superpositions of different quasi-momentum states. We demonstrate that the generation of such kind of states...
Edward W. Hagley, Lu Deng, William D. Phillips, Keith Burnett, Charles W. Clark
Although quantum mechanics is now a century old, its name still evokes the mysterious aspects of modern physics. Even its veteran practitioners regard quantum mechanics, on the one hand, as an...
Lifshitz-like transition and enhancement of correlations in a rotating bosonic ring lattice (2006)
Rey, Ana Maria, Burnett, Keith, Satija, Indubala I., Clark, Charles W.
We study the effects of rotation on one-dimensional ultra-cold bosons confined to a ring lattice. For commensurate systems, at a critical value of the rotation frequency, an infinitesimal interatomic...
Association of molecules using a resonantly modulated magnetic field (2006)
Hanna, Thomas M., Koehler, Thorsten, Burnett, Keith
We study the process of associating molecules from atomic gases using a magnetic field modulation that is resonant with the molecular binding energy. We show that maximal conversion is obtained by...
An investigation into why macroscopic systems behave classically (2006)
Hallwood, David W., Burnett, Keith, Dunningham, Jacob
We study why it is quite so hard to make a superposition of superfluid flows in a Bose-Einstein condensate. To do this we initially investigate the quantum states of $N$ atoms trapped in a 1D ring...
Quantum eigenstates and (pseudo-)classical accelerator modes of the Delta-Kicked Accelerator (2006)
Lemarié, Gabriel, Burnett, Keith
The quantum dynamics of a periodically driven system, the delta-kicked accelerator, is investigated in the semiclassical and pseudo-classical regimes, where quantum accelerator modes are observed. We...
Macroscopic superpositions of superfluid flows (2006)
Hallwood, David W., Dunningham, Jacob, Burnett, Keith
We present a scheme for creating macroscopic superpositions of the direction of superfluid flow around a loop. Using the Bose-Hubbard model we study an array of Bose-Einstein condensates trapped in...
Conventional character of the BCS-BEC cross-over in ultra-cold gases of 40K (2005)
Szymanska, Marzena H., Goral, Krzysztof, Koehler, Thorsten, Burnett, Keith
We use the standard fermionic and boson-fermion Hamiltonians to study the BCS-BEC cross-over near the 202 G resonance in a two-component mixture of fermionic 40K atoms employed in the experiment of...
Ramsey interferometry with atoms and molecules: two-body versus many-body phenomena (2004)
Goral, Krzysztof, Koehler, Thorsten, Burnett, Keith
We discuss the frequency and visibility of atom-molecule Ramsey fringes observed in recent experiments by Claussen et al.[Phys. Rev. A 67, 060701 (2003)]. In these experiments a 85Rb Bose-Einstein...
Dynamics of correlations in atomic Bose-Einstein condensates (2003)
Goral, Krzysztof, Koehler, Thorsten, Gasenzer, Thomas, Burnett, Keith
The Gross-Pitaevskii equation has been extremely successful in the theory of weakly-interacting Bose-Einstein condensates. However, present-day experiments reach beyond the regime of its validity due...
The nature of Feshbach molecules in Bose-Einstein condensates (2003)
Koehler, Thorsten, Gasenzer, Thomas, Julienne, Paul, Burnett, Keith
We discuss the long range nature of the molecules produced in recent experiments on molecular Bose-Einstein condensation. The properties of these molecules depend on the full two-body Hamiltonian and...
Bogoliubov approach to superfluidity of atoms in an optical lattice (2002)
Rey, Ana Maria, Burnett, Keith, Roth, Robert, Edwards, Mark, Williams, Carl J., Clark, Charles W.
We use the Bogoliubov theory of atoms in an optical lattice to study the approach to the Mott-insulator transition. We derive an explicit expression for the superfluid density based on the rigidity...
Microscopic theory of atom-molecule oscillations in a Bose-Einstein condensate (2002)
Koehler, Thorsten, Gasenzer, Thomas, Burnett, Keith
In a recent experiment at JILA [E.A. Donley et al., Nature (London) 417, 529 (2002)] an initially pure condensate of Rb-85 atoms was exposed to a specially designed time dependent magnetic field...
A microscopic quantum dynamics approach to the dilute condensed Bose gas (2001)
Koehler, Thorsten, Burnett, Keith
We derive quantum evolution equations for the dynamics of dilute condensed Bose gases. The approach contains, at different orders of approximation, for cases close to equilibrium, the Gross...
STIMULATED RAMAN MOLECULE FORMATION IN COLD ALKALI GASES. (1998)
Julienne, P. S., Burnett, Keith, Band, Yehuda B., Stwalley, W. C.
Author Institution: Atomic Physics Division, National Institute of Standards and Technology; Clarendon Laboratory, Department of Physics; Department of Chemistry, Ben-Gurion University; Department of...
Time-dependent studies of atomic systems / (1995)
Ruprecht, Peter A., Burnett, Keith.
BLDSC reference no.: D191660.