Clock shifts of optical transitions in ultracold atomic gases

TY - JOUR

T1 - Clock shifts of optical transitions in ultracold atomic gases

AU - Yu, Zhenhua

AU - Pethick, C. J.

PY - 2010/1/4

Y1 - 2010/1/4

N2 - We calculate the shift, due to interatomic interactions, of an optical transition in an atomic Fermi gas trapped in an optical lattice, as in recent experiments of Campbell et al.. Using a pseudospin formalism to describe the density matrix of atoms, we derive a Bloch equation which incorporates both spatial inhomogeneity of the probe laser field and interatomic interactions. Expressions are given for the frequency shift as a function of pulse duration, detuning of the probe laser, and the spatial dependence of the electric field of the probe beam. In the low temperature semiclassical regime, we find that the magnitude of the shift is proportional to the temperature.

AB - We calculate the shift, due to interatomic interactions, of an optical transition in an atomic Fermi gas trapped in an optical lattice, as in recent experiments of Campbell et al.. Using a pseudospin formalism to describe the density matrix of atoms, we derive a Bloch equation which incorporates both spatial inhomogeneity of the probe laser field and interatomic interactions. Expressions are given for the frequency shift as a function of pulse duration, detuning of the probe laser, and the spatial dependence of the electric field of the probe beam. In the low temperature semiclassical regime, we find that the magnitude of the shift is proportional to the temperature.

U2 - 10.1103/PhysRevLett.104.010801

DO - 10.1103/PhysRevLett.104.010801

M3 - Journal article

SN - 0031-9007

VL - 104

SP - 010801

JO - Physical Review Letters

JF - Physical Review Letters

IS - 1

ER -