Proposed search for an electric-dipole moment using laser-cooled 171Yb atoms

We have developed an all particle Fock-space relativistic coupled-cluster method for two-valence atomic systems. We then describe a scheme to employ the coupled-cluster wave function to calculate atomic properties. Based on these developments we calculate the excitation energies, magnetic hyperfine structure constants and electric dipole matrix elements of Sr, Ba and Yb. Further more, we calculate the electric quadrupole HFS constants and the electric dipole matrix elements of Sr + , Ba + and Yb + . For these we use the one-valence coupled-cluster wave functions obtained as an intermediate in the two-valence calculations. We also calculate the magnetic dipole hyperfine structure constants of Yb + .

show abstract

“…There are connected and disconnected terms, however, only the connected terms remain [16] on both sides of Eq. (35). We get…”

Section: CC Equation From Bloch Equationmentioning

confidence: 92%

Fock-space relativistic coupled-cluster calculations of two-valence atoms

Mani

Angom

2011

Phys. Rev. A

View full text Add to dashboard Cite

show abstract

“…Using this method, we hope to be able to further improve the accuracy of the current technique. We plan to measure excited-state hyperfine structure in other atoms that are of interest for PNC measurements, such as Cs and Yb [17]. * * *…”

mentioning

confidence: 99%

High-resolution hyperfine spectroscopy of excited states using electromagnetically induced transparency

et al. 2005

View full text Add to dashboard Cite

PACS. 32.10.Fn -Fine and hyperfine structure. PACS. 42.50.Gy -Effects of atomic coherence on propagation, absorption, and amplification of light. PACS. 42.50.-p -Quantum optics.Abstract. -We use the phenomenon of electromagnetically-induced transparency in a threelevel atomic system for hyperfine spectroscopy of upper states that are not directly coupled to the ground state. The three levels form a ladder system: the probe laser couples the ground state to the lower excited state, while the control laser couples the two upper states. As the frequency of the control laser is scanned, the probe absorption shows transparency peaks whenever the control laser is resonant with a hyperfine level of the upper state. As an illustration of the technique, we measure hyperfine structure in the 7S 1/2 states of 85 Rb and 87 Rb, and obtain an improvement of more than an order of magnitude over previous values.The use of coherent-control techniques in three-level systems is now an important tool for modifying the absorption properties of a weak probe laser [1,2,3]. For example, in the phenomenon of electromagnetically induced transparency (EIT), an initially absorbing medium is made transparent to a probe beam when a strong control laser is switched on [4,5]. EIT techniques have several practical applications in probe amplification [6], lasing without inversion [7], and suppression of spontaneous emission [3,8,9,10]. Experimental observations of EIT have been mainly done using alkali atoms (such as Rb and Cs), where the transitions have strong oscillator strengths and can be accessed with low-cost tunable diode lasers.In this paper, we use the phenomenon of EIT in a novel application, namely high-resolution spectroscopy of hyperfine structure in excited states. The experiments are done in a ladder system, where the control laser drives the upper transition and the probe laser measures absorption on the lower transition. In normal EIT experiments, the frequency of the probe laser is scanned while the frequency of the control laser is kept fixed. By contrast, in our technique, it is the frequency of the control laser that is scanned while the probe laser remains locked on resonance. The probe-absorption signal then shows transparency peaks every time the control laser comes into resonance with a hyperfine level of the excited state.Measurement of hyperfine structure in excited states is important because these states are used in diverse experiments ranging from atomic signatures of parity non-conservation (PNC)

show abstract

“…To gain a tighter control of this systematic effect, and thereby increasing the EDM measurement sensitivity, it would be necessary to manipulate the velocity of the moving Tl atoms, a realm that calls for the well-established laser cooling technique [15,16]. * ywliu@phys.nthu.edu.tw EDM searches in a laser-cooled system or its variants (e.g., magneto-optical trap, atomic fountain, or three-dimensional optical lattice) have been recently proposed for 225 Ra [17,18], 133 Cs [19], and 171 Yb [20]. In particular, a laser-cooled EDM search was carried out on a Cs atomic beam slowed to 3 m/s [2].…”

Section: Introductionmentioning

confidence: 99%

Prospects of laser cooling in atomic thallium

et al. 2011

View full text Add to dashboard Cite

One of the most precisely determined upper limits for the electron electric dipole moment (EDM) is set by the thallium (Tl) atomic beam experiment. One way to enhance the sensitivity of the atomic beam setup is to laser cool the Tl atoms to reduce the EDM-like phase caused by the E×v effect. In this report, a cooling scheme based on the 6P 3/2 (F = 2) ↔ 6D 5/2 (F = 3) transition in Tl is proposed. The absolute frequency measurement of this nearly closed-cycle transition was performed in an atomic beam apparatus. Two Ti:sapphire lasers were frequency-doubled using enhancement cavities in X-type configurations to provide the needed 377-and 352-nm light sources for the optical pumping and cooling transitions, respectively. The absolute frequency of this cooling transition is determined to be 851 634 646(56) MHz.

show abstract

Proposed search for an electric-dipole moment using laser-cooled 171Yb atoms

Cited by 30 publications

References 29 publications

Fock-space relativistic coupled-cluster calculations of two-valence atoms

Fock-space relativistic coupled-cluster calculations of two-valence atoms

High-resolution hyperfine spectroscopy of excited states using electromagnetically induced transparency

Prospects of laser cooling in atomic thallium

Contact Info

Product

Resources

About