A high phase-space-density gas of polar molecules

被引：1581

作者：

Ni, K. -K. ^{[1
,2
]}

Ospelkaus, S. ^{[1
,2
]}

de Miranda, M. H. G. ^{[1
,2
]}

Pe'er, A. ^{[1
,2
]}

Neyenhuis, B. ^{[1
,2
]}

Zirbel, J. J. ^{[1
,2
]}

Kotochigova, S. ^{[3
]}

Julienne, P. S. ^{[4
,5
]}

Jin, D. S. ^{[1
,2
]}

Ye, J. ^{[1
,2
]}

机构：

[1] Natl Inst Stand & Technol, JILA, Boulder, CO 80309 USA

[2] Univ Colorado, Dept Phys, Boulder, CO 80309 USA

[3] Temple Univ, Dept Phys, Philadelphia, PA 19122 USA

[4] NIST, Joint Quantum Inst, Gaithersburg, MD 20899 USA

[5] Univ Maryland, Gaithersburg, MD 20899 USA

来源：

SCIENCE | 2008年 / 322卷 / 5899期

关键词：

D O I：

10.1126/science.1163861

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

A quantum gas of ultracold polar molecules, with long-range and anisotropic interactions, not only would enable explorations of a large class of many-body physics phenomena but also could be used for quantum information processing. We report on the creation of an ultracold dense gas of potassium-rubidium ((40)K(87)Rb) polar molecules. Using a single step of STIRAP (stimulated Raman adiabatic passage) with two-frequency laser irradiation, we coherently transfer extremely weakly bound KRb molecules to the rovibrational ground state of either the triplet or the singlet electronic ground molecular potential. The polar molecular gas has a peak density of 10(12) per cubic centimeter and an expansion-determined translational temperature of 350 nanokelvin. The polar molecules have a permanent electric dipole moment, which we measure with Stark spectroscopy to be 0.052(2) Debye (1 Debye = 3.336 x 10(-30) coulomb-meters) for the triplet rovibrational ground state and 0.566(17) Debye for the singlet rovibrational ground state.

引用

页码：231 / 235

页数：5

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