Spectroscopic insensitivity to cold collisions in a two-state mixture of fermions

Abstract

We have experimentally demonstrated the absence of spectroscopic resonance shifts in a mixture of two interacting Fermi gases. This result is linked to observations in an ultracold gas of thermal bosons. There, the measured resonance shift due to interstate collisions is independent of the coherence in the system, and twice that expected from the equilibrium energy splitting between the two states in a fully decohered cloud. We give a simple theoretical explanation of these observations, which elucidates the effect of coherent radiation on an incoherent mixture of atoms.

References in corpus (12)

• Bose-Einstein Condensation of Atomic Hydrogen
• Radio-Frequency Spectroscopy of Ultracold Fermions
• Effect of cold collisions on spin coherence and resonance shifts in a magnetically trapped ultra-cold gas
• Fifty-fold improvement in the number of quantum degenerate fermionic atoms
• Internal state conversion in ultracold gases
• Internal waves and synchronized precession in a cold vapor
• Longitudinal spin waves in a dilute Bose gas
• Optical excitations in a non-ideal Bose gas
• Cold Collision Frequency Shift of an Optical Spectrum of a Trapped Gas
• Collisional Frequency Shifts of Absorption Lines in an Atomic Hydrogen Gas
• Large amplitude spin waves in ultra-cold gases
• Theory of the Ramsey spectroscopy and anomalous segregation in ultra-cold rubidium

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