Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Ultracold Fermion Cooling Cycle Using Heteronuclear Feshbach Resonances



M A. Morales, N Nygaard, J E. Williams, Charles W. Clark


We consider an ideal gas of Bose and Fermi atoms in a harmonic trap, with a Feshbach resonance in the interspecies atomic scattering that can lead to formation of fermionic molecules. We map out the phase diagram for this three-component mixture in chemical and thermal equilibrium. Considering adiabatic association and dissociation of the molecules, we identify a possible cooling cycle, which in ideal circumstances can yield an exponential increase of the phase-space density.
New Journal of Physics


Bose-Ferm mixture, cooling cycle, Feshbach resonance, molecules


Morales, M. , Nygaard, N. , Williams, J. and Clark, C. (2005), Ultracold Fermion Cooling Cycle Using Heteronuclear Feshbach Resonances, New Journal of Physics (Accessed July 14, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created March 31, 2005, Updated October 12, 2021