Tuning the dipolar interaction in quantum gases(3)

We have studied the tunability of the interaction between permanent dipoles in Bose-Einstein condensates. Based on time-dependent control of the anisotropy of the dipolar interaction, we show that even the very weak magnetic dipole coupling in alkali gases

0.1

α

0.0

-0.1

20406080100

t (ms)

FIG.1.Inrubidiumthelong-rangedipole-dipoleinterac-tiondoesnotmodifyinanappreciablewaythegroundstatedensity.Whenthemagneticdipolesaredrivenonresonancewithatransversalquadrupolemodetheanisotropyα(Eq.(15))isgrowingwithtime(hereweassumeaqualityfactorQ=50).

qualityfactorQ=

√

cos2 1

4π

3λ20

rλnz

xλ,

z

r