We measure the ac Zeeman force on an ultracold gas of $^{87}\mathrm{Rb}$ due to a microwave magnetic field targeted to the 6.8 GHz hyperfine splitting of these atoms. An atom chip produces a microwave near field with a strong amplitude gradient, and we observe a force over three times the strength of gravity. Our measurements are consistent with a simple two-level theory for the ac Zeeman effect and demonstrate its resonant, bipolar, and spin-dependent nature. We observe that the dressed-atom eigenstates gradually mix over time and have mapped out this behavior as a function of magnetic field and detuning. We demonstrate the practical spin selectivity of the force by pushing or pulling a specific spin state while leaving other spin states unmoved.We measure the ac Zeeman force on an ultracold gas of $^{87}\mathrm{Rb}$ due to a microwave magnetic field targeted to the 6.8 GHz hyperfine splitting of these atoms. An atom chip produces a microwave near field with a strong amplitude gradient, and we observe a force over three times the strength of gravity. Our measurements are consistent with a simple two-level theory for the ac Zeeman effect and demonstrate its resonant, bipolar, and spin-dependent nature. We observe that the dressed-atom eigenstates gradually mix over time and have mapped out this behavior as a function of magnetic field and detuning. We demonstrate the practical spin selectivity of the force by pushing or pulling a specific spin state while leaving other spin states unmoved.

Physical Review AApr 27, 201814 citations

Radio-frequency ac Zeeman force for ultracold atoms

Andrew P. Rotunno, William Miyahira, Shuangli Du +1 more

We measure the ac Zeeman force acting on ultracold $^{87}\mathrm{Rb}$ atoms due to a radio frequency (rf) field driving intramanifold Zeeman transitions near 8 MHz. We observe about 2.5 times the force of gravity for $\ensuremath{\approx}14$ mW of rf power acting on atoms $\ensuremath{\approx}100\phantom{\rule{4pt}{0ex}}\textmu{}\mathrm{m}$ from the atom chip. Our measurements are consistent with theoretical predictions and demonstrate the spin-state dependence of the force, as well as its resonant and bipolar behavior. We demonstrate the ac Stern-Gerlach effect by spatially separating a spin mixture, using initial detuning to determine which spins are ac Zeeman high- and low-field seekers. With an eye towards using this force for atom trapping, we observe the time dependence of dressed state spin mixing as a function of detuning and power.We measure the ac Zeeman force acting on ultracold $^{87}\mathrm{Rb}$ atoms due to a radio frequency (rf) field driving intramanifold Zeeman transitions near 8 MHz. We observe about 2.5 times the force of gravity for $\ensuremath{\approx}14$ mW of rf power acting on atoms $\ensuremath{\approx}100\phantom{\rule{4pt}{0ex}}\textmu{}\mathrm{m}$ from the atom chip. Our measurements are consistent with theoretical predictions and demonstrate the spin-state dependence of the force, as well as its resonant and bipolar behavior. We demonstrate the ac Stern-Gerlach effect by spatially separating a spin mixture, using initial detuning to determine which spins are ac Zeeman high- and low-field seekers. With an eye towards using this force for atom trapping, we observe the time dependence of dressed state spin mixing as a function of detuning and power.

Physical Review ADec 23, 20241 citation

Anomalous Zeeman Effect

WORLD SCIENTIFIC eBooksApr 1, 19990 citations

Measurements of Zeeman Shifts

Mickey McDonald

Springer thesesNov 3, 20171 citation

We measure the ac Zeeman force on an ultracold gas of

^{87}\mathrm{Rb}

due to a microwave magnetic field targeted to the 6.8 GHz hyperfine splitting of these atoms. An atom chip produces a microwave near field with a strong amplitude gradient, and we observe a force over three times the strength of gravity. Our measurements are consistent with a simple two-level theory for the ac Zeeman effect and demonstrate its resonant, bipolar, and spin-dependent nature. We observe that the dressed-atom eigenstates gradually mix over time and have mapped out this behavior as a function of magnetic field and detuning. We demonstrate the practical spin selectivity of the force by pushing or pulling a specific spin state while leaving other spin states unmoved.

We measure the ac Zeeman force acting on ultracold

^{87}\mathrm{Rb}

atoms due to a radio frequency (rf) field driving intramanifold Zeeman transitions near 8 MHz. We observe about 2.5 times the force of gravity for $\ensuremath{\approx}14$ mW of rf power acting on atoms $\ensuremath{\approx}100\phantom{\rule{4pt}{0ex}}\textmu{}\mathrm{m}$ from the atom chip. Our measurements are consistent with theoretical predictions and demonstrate the spin-state dependence of the force, as well as its resonant and bipolar behavior. We demonstrate the ac Stern-Gerlach effect by spatially separating a spin mixture, using initial detuning to determine which spins are ac Zeeman high- and low-field seekers. With an eye towards using this force for atom trapping, we observe the time dependence of dressed state spin mixing as a function of detuning and power.