Doubly quantized vortices
Y. Shin, M. Saba, M. Vengalattore, T. A. Pasquini, C. Sanner, A. E. Leanhardt, M. Prentiss, D. E. Pritchard, and W. Ketterle:
Dynamical Instability of a Doubly Quantized Vortex in a Bose-Einstein condensate.
Phys. Rev. Lett. 93 , 160406 (2004).
Paper (pdf, 183 kB)

Interspecies Feshbach Resonances
C.A. Stan, M.W. Zwierlein, C.H. Schunck, S.M.F. Raupach, and W. Ketterle:
Observation of Feshbach resonances between two different atomic species.
Phys. Rev. Lett. 93 , 143001 (2004).
Paper (pdf, 147 kB)

Quantum reflection
T.A. Pasquini, Y. Shin, C. Sanner, M. Saba, A. Schirotzek, D.E. Pritchard, and W. Ketterle:
Quantum reflection of atoms from a solid surface at normal incidence.
Phys. Rev. Lett. 93 , 223201 (2004).
Paper (pdf, 249 kB)

Condensation of Fermionic Atom Pairs Near a Feshbach Resonance
M.W. Zwierlein, C.A. Stan, C.H. Schunck, S.M.F. Raupach, A.J. Kerman, and W. Ketterle.
Condensation of Pairs of Fermionic Atoms Near a Feshbach Resonance.
Phys. Rev. Lett. 92, 120403 (2004).
Paper (pdf, 483 kB)Figure_2 ISI Fast breaking comment

Dissociation of Ultracold Sodium Molecules
T. Mukaiyama, J. R. Abo-Shaeer, K. Xu, J. K. Chin, and W. Ketterle:
Dissociation and Decay of Ultracold Sodium Molecules.
Phys. Rev. Lett. 92, 180402 (2004).
Summary (pdf)Paper (pdf, 277 kB)

BEC Distillation in a Double-Well Potential
Y. Shin, M. Saba, A. Schirotzek, T. A. Pasquini, A. E. Leanhardt, D. E. Pritchard, and W. Ketterle:
Distillation of Bose-Einstein condensates in a double-well potential.
Phys. Rev. Lett. 92, 150401 (2004).
Summary (pdf)Paper (pdf, 148 kB)

Raman Superradiance
D. Schneble, G.K. Campbell, E.W. Streed, M. Boyd, D.E. Pritchard, and W. Ketterle:
Raman Amplification of Matter Waves.
Phys. Rev. A 69, 041601(R) (2004).
Summary (pdf)Paper (pdf, 402 kB)

Zero-temperature collisions of fermions
S. Gupta, Z. Hadzibabic, J.R. Anglin, and W. Ketterle:
Collisions in zero temperature Fermi gases.
Phys. Rev. Lett. 92, 100401 (2004).
Summary (pdf)Paper (pdf, 102 kB)

Interferometry in a double-well potential
Y. Shin, M. Saba, T. Pasquini, W. Ketterle, D.E. Pritchard, and A.E. Leanhardt:
Atom interferometry with Bose-Einstein condensates in a double-well potential.
Phys. Rev. Lett. 92, 050405 (2004).
Summary (pdf)Paper (pdf, 282 kB)

Further publications
About ultralow temperatures
W. Ketterle:
How are temperatures close to absolute zero achieved and measured?
Scientific American.com, Ask the Experts, January 19, 2004.
http://www.sciam.com/askexpert_question.cfm?articleID=00037290-04B2-1007-84B283414B7F0000&pageNumber=1&catID=3
Scientific American, May 2004, p. 120.