TY - JOUR
T1 - High-Sensitivity rf Spectroscopy of a Strongly Interacting Fermi Gas
AU - Shkedrov, Constantine
AU - Florshaim, Yanay
AU - Ness, Gal
AU - Gandman, Andrey
AU - Sagi, Yoav
N1 - Publisher Copyright: © 2018 American Physical Society.
PY - 2018/8/30
Y1 - 2018/8/30
N2 - rf spectroscopy is one of the most powerful probing techniques in the field of ultracold gases. We report on a novel rf spectroscopy scheme with which we can detect very weak signals of only a few atoms. Using this method, we extended the experimentally accessible photon-energies range by an order of magnitude compared to previous studies. We directly verify a universal property of fermions with short-range interactions which is a power-law scaling of the rf spectrum tail all the way up to the interaction scale. We also determine, with high precision, the trap average contact parameter for different interaction strength. Finally, we employ our technique to precisely measure the binding energy of Feshbach molecules in an extended range of magnetic fields. These data are used to extract a new calibration of the Feshbach resonance between the two lowest energy levels of K40.
AB - rf spectroscopy is one of the most powerful probing techniques in the field of ultracold gases. We report on a novel rf spectroscopy scheme with which we can detect very weak signals of only a few atoms. Using this method, we extended the experimentally accessible photon-energies range by an order of magnitude compared to previous studies. We directly verify a universal property of fermions with short-range interactions which is a power-law scaling of the rf spectrum tail all the way up to the interaction scale. We also determine, with high precision, the trap average contact parameter for different interaction strength. Finally, we employ our technique to precisely measure the binding energy of Feshbach molecules in an extended range of magnetic fields. These data are used to extract a new calibration of the Feshbach resonance between the two lowest energy levels of K40.
UR - http://www.scopus.com/inward/record.url?scp=85053143346&partnerID=8YFLogxK
U2 - https://doi.org/10.1103/PhysRevLett.121.093402
DO - https://doi.org/10.1103/PhysRevLett.121.093402
M3 - مقالة
SN - 0031-9007
VL - 121
JO - Physical Review Letters
JF - Physical Review Letters
IS - 9
M1 - 093402
ER -