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Bulletin of the American Physical Society

Effects of dipole-dipole interaction in atomic vapors probed by two-dimensional coherent spectroscopy

Danfu Liang, ShaoGang Yu, Yifu Zhu, Xiaojun Liu, Hebin Li

Published Mar 6, 2020• 0 citations
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Abstract Multidimensional coherent spectroscopy (MDCS) of atomic ensembles is discussed in this chapter. Atomic vapors such as potassium and rubidium atomic vapors are used a model system for demonstrating MDCS. The technique of MDCS can also be used to probe many-body dipole-dipole interaction and correlation in atoms by using double-quantum 2D spectroscopy. Multi-quantum 2D spectroscopy can detect many-body correlations associated with coherent states of multiple atoms in atoms.

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Many-body interactions and correlations in atomic ensembles are fundamental in understanding many-body effects such as collective and emergent phenomena and also play an important role in various atom-based applications. Optical two-dimensional coherent spectroscopy (2DCS) provides a powerful tool to measure many-body interactions and correlations. Here, we present the study of many-body dipole-dipole interactions and correlations in potassium and rubidium atomic vapors by using double-quantum and multi-quantum 2DCS. The results show that double-quantum 2DCS provides sensitive and background-free detection of weak dipole-dipole interaction between atoms with a mean separation up to about 16 μm, and multi-quantum 2DCS can excite and detect multi-atom states (Dicke states) with up to eight correlated atoms. The technique of optical 2DCS can provide a new approach to study many-body physics in atomic ensembles and can be potentially implemented to measure many-body effects in cold atoms and other atomic/molecular systems.