Christian Sanner
Massachusetts Institute of Technology
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Publication
Featured researches published by Christian Sanner.
Physical Review A | 2005
Yong-il Shin; Christian Sanner; Gyu-Boong Jo; T.A. Pasquini; Michele Saba; Wolfgang Ketterle; David E. Pritchard; Mukund Vengalattore; Mara Prentiss
We have used a microfabricated atom chip to split a single Bose-Einstein condensate of sodium atoms into two spatially separated condensates. Dynamical splitting was achieved by deforming the trap along the tightly confining direction into a purely magnetic double-well potential. We observed the matter wave interference pattern formed upon releasing the condensates from the microtraps. The intrinsic features of the quartic potential at the merge point, such as zero trap frequency and extremely high field-sensitivity, caused random variations of the relative phase between the two split condensates. Moreover, the perturbation from the abrupt change of the trapping potential during the splitting was observed to induce vortices.
Physical Review Letters | 2004
Yong-il Shin; Michele Saba; Mukund Vengalattore; Ta Pasquini; Christian Sanner; Ae Leanhardt; Mara Prentiss; De Pritchard; Wolfgang Ketterle
Doubly quantized vortices were topologically imprinted in /F=1> 23Na condensates, and their time evolution was observed using a tomographic imaging technique. The decay into two singly quantized vortices was characterized and attributed to dynamical instability. The time scale of the splitting process was found to be longer at higher atom density.
Physical Review Letters | 2004
T.A. Pasquini; Yong-il Shin; Christian Sanner; Michele Saba; Andre Schirotzek; David E. Pritchard; Wolfgang Ketterle
We observed quantum reflection of ultracold atoms from the attractive potential of a solid surface. Extremely dilute Bose-Einstein condensates of 23Na, with peak density 10(11)-10(12) atoms/cm(3), confined in a weak gravitomagnetic trap were normally incident on a silicon surface. Reflection probabilities of up to 20% were observed for incident velocities of 1-8 mm/s. The velocity dependence agrees qualitatively with the prediction for quantum reflection from the attractive Casimir-Polder potential. Atoms confined in a harmonic trap divided in half by a solid surface exhibited extended lifetime due to quantum reflection from the surface, implying a reflection probability above 50%.
Physical Review Letters | 2012
Christian Sanner; Edward J. Su; Wujie Huang; Aviv Keshet; Jonathon Gillen; Wolfgang Ketterle
A degenerate Fermi gas is rapidly quenched into the regime of strong effective repulsion near a Feshbach resonance. The spin fluctuations are monitored using speckle imaging and, contrary to several theoretical predictions, the samples remain in the paramagnetic phase for an arbitrarily large scattering length. Over a wide range of interaction strengths a rapid decay into bound pairs is observed over times on the order of 10ℏ/E(F), preventing the study of equilibrium phases of strongly repulsive fermions. Our work suggests that a Fermi gas with strong short-range repulsive interactions does not undergo a ferromagnetic phase transition.
Physical Review Letters | 2010
Christian Sanner; Edward J. Su; Aviv Keshet; Ralf Gommers; Yong-il Shin; Wujie Huang; Wolfgang Ketterle
We study density profiles of an ideal Fermi gas and observe Pauli suppression of density fluctuations (atom shot noise) for cold clouds deep in the quantum degenerate regime. Strong suppression is observed for probe volumes containing more than 10 000 atoms. Measuring the level of suppression provides sensitive thermometry at low temperatures. After this method of sensitive noise measurements has been validated with an ideal Fermi gas, it can now be applied to characterize phase transitions in strongly correlated many-body systems.
international quantum electronics conference | 2004
T.A. Pasquini; Aaron E. Leanhardt; Michele Saba; Christian Sanner; Andre Schirotzek; Yong-il Shin; David E. Pritchard; Wolfgang Ketterle
Bose-Einstein condensates confined by a combination of gravitational and magnetic force exhibit very low peak density (5*1010 atoms*cm-3) and kinetic temperature (450 pK). Such ensembles are predicted to experience quantum reflection from material surfaces
Physical Review Letters | 2011
Christian Sanner; Edward J. Su; Aviv Keshet; Wujie Huang; Jonathon I. Gillen; Ralf Gommers; Wolfgang Ketterle
Science | 2005
Michele Saba; T.A. Pasquini; Christian Sanner; Yong-il Shin; Wolfgang Ketterle; David E. Pritchard
arXiv: Atomic Physics | 2018
Christian Sanner; N. Huntemann; Richard Lange; Christian Tamm; Ekkehard Peik; M. S. Safronova; Sergey G. Porsev
Physical Review Letters | 2018
Christian Sanner; N. Huntemann; Richard Lange; Christian Tamm; Ekkehard Peik