Presented By: Department of Physics
CM-AMO Seminar | Ultrafast Meets Ultracold: Tow ard Optical 2D Coherent Spectroscopy of Many-Body Physics in Cold Atoms
Hebin Li (Florida International University)
Ultrafast femtosecond lasers are rarely used to study ultracold atoms since they are intrinsically incompatible in their characteristic time scales. However, ultrafast nonlinear spectroscopy, particularly optical 2D coherent spectroscopy (2DCS), enabled by femtosecond lasers can be a powerful tool for studying many-body physics in atomic ensembles including cold atoms. For example, double-quantum 2DCS provides sensitive and background-free detection of weak dipole-dipole interactions, as demonstrated in both potassium (K) and rubidium (Rb) atomic vapors [1-2]. The technique can be extended to multi-quantum 2DCS which can probe multi-atom correlated states (Dicke states) with up to eight atoms in a K vapor [4-5]. We have also observed collective resonances of higher excited states (D state) in addition to P state [5].
Compared to thermalized atom vapors, cold atoms provide a well-controlled environment. With the recent advance in cooling and trapping an array of single atoms by using optical tweezers, it is possible to study many-body physics in an atom array with a deterministic atom number and interatomic spacing. Our previous 2DCS measurements in a dilute atomic vapor have shown that 2DCS has sufficient sensitivity for a typical cold atom density [6] and even a single atom. Recently, we have implemented optical 2DCS on Rb cold atoms at about 100 K in a magneto-optical trap (MOT). We have obtained one-, two-, and three-quantum 2D spectra of cold atoms, enabling the capability of optical 2DCS study of many-body physics in cold atoms and ultimately in atom arrays.
References:
[1] X. Dai, M. Richter, H. Li, A.D. Bristow, C. Falvo, S. Mukamel, and S.T. Cundiff, Phys. Rev. Lett. 108, 193201 (2012).
[2] F. Gao, S.T. Cundiff, and H. Li, Opt. Lett. 41, 2954 (2016).
[3] S. Yu, M. Titze, Y. Zhu, X. Liu, and H. Li, Opt. Lett. 44, 2795 (2019).
[4] D. Liang, and H. Li, J. Chem. Phys. 154, 214301 (2021).
[5] D. Liang, Y. Zhu, and H. Li, Phys. Rev. Lett. 128, 103601 (2022).
[6] S. Yu, M. Titze, Y. Zhu, X. Liu, and H. Li, Opt. Express 27, 28891 (2019).
Compared to thermalized atom vapors, cold atoms provide a well-controlled environment. With the recent advance in cooling and trapping an array of single atoms by using optical tweezers, it is possible to study many-body physics in an atom array with a deterministic atom number and interatomic spacing. Our previous 2DCS measurements in a dilute atomic vapor have shown that 2DCS has sufficient sensitivity for a typical cold atom density [6] and even a single atom. Recently, we have implemented optical 2DCS on Rb cold atoms at about 100 K in a magneto-optical trap (MOT). We have obtained one-, two-, and three-quantum 2D spectra of cold atoms, enabling the capability of optical 2DCS study of many-body physics in cold atoms and ultimately in atom arrays.
References:
[1] X. Dai, M. Richter, H. Li, A.D. Bristow, C. Falvo, S. Mukamel, and S.T. Cundiff, Phys. Rev. Lett. 108, 193201 (2012).
[2] F. Gao, S.T. Cundiff, and H. Li, Opt. Lett. 41, 2954 (2016).
[3] S. Yu, M. Titze, Y. Zhu, X. Liu, and H. Li, Opt. Lett. 44, 2795 (2019).
[4] D. Liang, and H. Li, J. Chem. Phys. 154, 214301 (2021).
[5] D. Liang, Y. Zhu, and H. Li, Phys. Rev. Lett. 128, 103601 (2022).
[6] S. Yu, M. Titze, Y. Zhu, X. Liu, and H. Li, Opt. Express 27, 28891 (2019).
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