TY - JOUR
T1 - In situ momentum-distribution measurement of a quantum degenerate Fermi gas using Raman spectroscopy
AU - Shkedrov, Constantine
AU - Ness, Gal
AU - Florshaim, Yanay
AU - Sagi, Yoav
N1 - Publisher Copyright: © 2020 American Physical Society.
PY - 2020/1/10
Y1 - 2020/1/10
N2 - The ability to directly measure the momentum distribution of quantum gases is both unique to these systems and pivotal in extracting many other important observables. Here we use Raman transitions to measure the momentum distribution of a weakly interacting Fermi gas in a harmonic trap. For narrow atomic dispersions, momentum and energy conservation imply a linear relation between the two-photon detuning and the atomic momentum. We detect the number of atoms transferred by the Raman beams using sensitive fluorescence detection in a magneto-optical trap. We apply this technique to a degenerate weakly interacting Fermi gas at different temperatures. The measured momentum distributions match theoretical curves over two decades, and the extracted temperatures are in very good agreement with the ones obtained from a conventional time-of-flight technique. The main advantages of our measurement scheme are that it can be spatially selective and directly probe a trapped gas, it can be completed in a relatively short time, and due to its high sensitivity, it can be used with very small clouds.
AB - The ability to directly measure the momentum distribution of quantum gases is both unique to these systems and pivotal in extracting many other important observables. Here we use Raman transitions to measure the momentum distribution of a weakly interacting Fermi gas in a harmonic trap. For narrow atomic dispersions, momentum and energy conservation imply a linear relation between the two-photon detuning and the atomic momentum. We detect the number of atoms transferred by the Raman beams using sensitive fluorescence detection in a magneto-optical trap. We apply this technique to a degenerate weakly interacting Fermi gas at different temperatures. The measured momentum distributions match theoretical curves over two decades, and the extracted temperatures are in very good agreement with the ones obtained from a conventional time-of-flight technique. The main advantages of our measurement scheme are that it can be spatially selective and directly probe a trapped gas, it can be completed in a relatively short time, and due to its high sensitivity, it can be used with very small clouds.
UR - http://www.scopus.com/inward/record.url?scp=85078189956&partnerID=8YFLogxK
U2 - https://doi.org/10.1103/PhysRevA.101.013609
DO - https://doi.org/10.1103/PhysRevA.101.013609
M3 - مقالة
SN - 2469-9926
VL - 101
JO - Physical Review A
JF - Physical Review A
IS - 1
M1 - 013609/
ER -