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1. Extended Range of Dipole-Dipole Interactions in Periodically Structured Photonic Media

   https://doi.org/10.1103/PhysRevLett.123.173901  

   Ying, Lei ; Zhou, Ming ; Mattei, Michael ; Liu, Boyuan ; Campagnola, Paul ; Goldsmith, Randall H. ; Yu, Zongfu ( October 2019 , Physical Review Letters)
2. Observation of long-range dipole-dipole interactions in hyperbolic metamaterials

   https://doi.org/10.1126/sciadv.aar5278  

   Newman, Ward D. ; Cortes, Cristian L. ; Afshar, Amir ; Cadien, Ken ; Meldrum, Al ; Fedosejevs, Robert ; Jacob, Zubin ( October 2018 , Science Advances)

   Dipole-dipole interactions ( V dd ) between closely spaced atoms and molecules are related to real photon and virtual photon exchange between them and decrease in the near field connected with the characteristic Coulombic dipole field law. The control and modification of this marked scaling with distance have become a long-standing theme in quantum engineering since dipole-dipole interactions govern Van der Waals forces, collective Lamb shifts, atom blockade effects, and Förster resonance energy transfer. We show that metamaterials can fundamentally modify these interactions despite large physical separation between interacting quantum emitters. We demonstrate a two orders of magnitude increase in the near-field resonant dipole-dipole interactions at intermediate field distances (10 times the near field) and observe the distance scaling law consistent with a super-Coulombic interaction theory curtailed only by absorption and finite size effects of the metamaterial constituents. We develop a first-principles numerical approach of many-body dipole-dipole interactions in metamaterials to confirm our theoretical predictions and experimental observations. In marked distinction to existing approaches of engineering radiative interactions, our work paves the way for controlling long-range dipole-dipole interactions using hyperbolic metamaterials and natural hyperbolic two-dimensional materials. 

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3. Dipole-Dipole Frequency Shifts in Multilevel Atoms

   https://doi.org/10.1103/PhysRevLett.127.013401  

   Cidrim, A. ; Piñeiro Orioli, A. ; Sanner, C. ; Hutson, R. B. ; Ye, J. ; Bachelard, R. ; Rey, A. M. ( June 2021 , Physical Review Letters)

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4. Mid-Brunhes strengthening of the Indian Ocean Dipole caused increased equatorial East African and decreased Australasian rainfall: MID-BRUNHES INDIAN OCEAN DIPOLE

   https://doi.org/10.1029/2009GL042225  

   Gupta, Anil K. ; Sarkar, Sudipta ; De, Soma ; Clemens, Steven C. ; Velu, Angamuthu ( March 2010 , Geophysical Research Letters)

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5. Probing dipole-dipole interaction at cold-atom density range using optical two-dimensional coherent spectroscopy

   https://doi.org/10.1364/CLEO_AT.2018.JTh2A.41  

   Yu, ShaoGang ; Titze, Michael ; Liu, XiaoJun ; Li, Hebin ( May 2018 , Conference on Lasers and Electro-Optics, OSA Technical Digest (online) (Optical Society of America, 2018))

   We experimentally demonstrate that the dipole-dipole interaction in a potassium vapor at cold atom density can be observed using optical 2D coherent spectroscopy. This paves the way to implement 2D spectroscopy in cold atoms. 

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