Sign-changing photon-mediated atom interactions in multimode cavity QED

Y. Guo, R. M. Kroeze, V. D. Vaidya, J. Keeling, and B. L. Lev
Sign-changing photon-mediated atom interactions in multimode cavity QED
Physical Review Letters 122, 193601 (2019).  pdf
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arXiv:1810.11086