Frozen Rydberg Gas:
ثبت نشده
چکیده
A frozen Rydberg gas is a sample of atoms with highly excited electronic states and very low temperature. In our experiments, Rb atoms are cooled and trapped in a magneto-optical trap (MOT) (fig.1&2), and excited to the Rydberg states (the principle quantum number n ~30) by pulsed dye lasers (fig.3). In such a system, the density of Rydberg atoms Nd is typically ~10atoms/cm, and the temperature T is ~300 K. The typical displacement R = v ~1 m of atoms moving at an average velocity v~38cm/s during the experiment time ~3 s is much less than the average interatomic distance R0 ~ (3/4 Nd)= 10 m. So to first order approximation, they can be considered “frozen” in their position during the experimental process.
منابع مشابه
Simulations using echo sequences to observe coherence in a cold Rydberg gas
We simulate the effect of special excitation pulses on a cold gas of atoms. First, a rotary echo sequence is used to examine the coherent nature of a frozen Rydberg gas. If collective excitation and de-excitation is present with little or no source of dephasing, after these pulses the system should be returned to a state with few excitations, and a strong echo signal should occur. We investigat...
متن کاملMany-body ionization in a frozen Rydberg gas.
In a dense gas of 300 microK 85Rb atoms of n approximately 50 ionization occurs on a 100 ns time scale, far too fast to be explained by the motion of the atoms or photoionization by 300 K blackbody radiation. Rapid ionization is accompanied by spectral broadening, with the spectrum becoming continuous at n=88 at a density of 5x10(10)cm(-3). The atomic transitions broaden both smoothly and by th...
متن کاملTwo-electron excitation of an interacting cold Rydberg gas.
We report the creation of an interacting cold Rydberg gas of strontium atoms. We show that the excitation spectrum of the inner valence electron is sensitive to the interactions in the Rydberg gas, even though they are mediated by the outer Rydberg electron. By studying the evolution of this spectrum we observe density-dependent population transfer to a state of higher angular momentum l. We de...
متن کاملWireless network control of interacting Rydberg atoms.
We identify a relation between the dynamics of ultracold Rydberg gases in which atoms experience a strong dipole blockade and spontaneous emission, and a stochastic process that models certain wireless random-access networks. We then transfer insights and techniques initially developed for these wireless networks to the realm of Rydberg gases, and explain how the Rydberg gas can be driven into ...
متن کاملOne-dimensional Rydberg gas in a magnetoelectric trap.
We study the quantum properties of Rydberg atoms in a magnetic Ioffe-Pritchard trap which is superimposed by a homogeneous electric field. Trapped Rydberg atoms can be created in long-lived electronic states exhibiting a permanent electric dipole moment of several hundred Debye. The resulting dipole-dipole interaction in conjunction with the radial confinement is demonstrated to give rise to an...
متن کامل