TY - JOUR
T1 - High sensitivity phonon spectroscopy of bose-einstein condensates using matter-wave interference
AU - Katz, N.
AU - Ozeri, R.
AU - Steinhauer, J.
AU - Davidson, N.
AU - Tozzo, C.
AU - Dalfovo, F.
N1 - Funding Information:
This work was supported in part by the Israel Ministry of Science, the Israel Science Foundation, and the DIP Foundation.
PY - 2004/11/29
Y1 - 2004/11/29
N2 - The low-momentum excitations of a Bose-Einstein condensate (BEC), using a novel matter-wave interference technique, was studied. The dynamics of phonons in freely expanding condensates was analyzed using both the Gross-Pitaevskii equation (GPE) and a dynamically rescaled Bogoliubov theory. It was found that axial low-momentum phonons were adiabatically converted by the expansion into free atoms with the same axial momentum. A strong matter-wave fringe patterns was observed in time-of-flight expansion images. It was shown that the fringe visibility was a sensitive spectroscopic probe of in-trap phonons, explained by use of Bogoliubov excitation projection method applied to the rescaled order parameter of the expanding condensate.
AB - The low-momentum excitations of a Bose-Einstein condensate (BEC), using a novel matter-wave interference technique, was studied. The dynamics of phonons in freely expanding condensates was analyzed using both the Gross-Pitaevskii equation (GPE) and a dynamically rescaled Bogoliubov theory. It was found that axial low-momentum phonons were adiabatically converted by the expansion into free atoms with the same axial momentum. A strong matter-wave fringe patterns was observed in time-of-flight expansion images. It was shown that the fringe visibility was a sensitive spectroscopic probe of in-trap phonons, explained by use of Bogoliubov excitation projection method applied to the rescaled order parameter of the expanding condensate.
UR - http://www.scopus.com/inward/record.url?scp=37649030560&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.93.220403
DO - 10.1103/PhysRevLett.93.220403
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
AN - SCOPUS:37649030560
SN - 0031-9007
VL - 93
JO - Physical Review Letters
JF - Physical Review Letters
IS - 22
M1 - 220403
ER -