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1. Fundamental figure of merit for engineering dipole-dipole interactions

   https://doi.org/10.1364/CLEO_QELS.2019.FTu3D.3  

   Cortes, Cristian L.; Newman, Ward; Boddeti, Ashwin K.; Sentz, Tyler; Jacob, Zubin (January 2019, Conference on Lasers and Electro Optics (CLEO))

   Over the last decade there has been a debate regarding the role of the photonic environment in enhancing, inhibiting and imparting coherence to dipole-dipole interactions. We develop a unified figure of merit to conclusively explain multiple recent experiments. 

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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. Observation of the dipole- and quadrupole-bound anions of 1,4-dicyanocyclohexane

   https://doi.org/10.1039/c9cp04010b  

   Liu, Gaoxiang; Ciborowski, Sandra M.; Pitts, Cody Ross; Graham, Jacob D.; Buytendyk, Allyson M.; Lectka, Thomas; Bowen, Kit H. (August 2019, Physical Chemistry Chemical Physics)

   Quadrupole-bound anions are negative ions in which their excess electrons are loosely bound by long-range electron-quadrupole attractions. Experimental evidence for quadrupole-bound anions has been scarce; until now, only trans -succinonitrile had been experimentally confirmed to form a quadrupole-bound anion. In this study, we present experimental evidence for a new quadrupole-bound anion. Our combined Rydberg electron transfer/anion photoelectron spectroscopy study demonstrates that the ee conformer of 1,4-dicyanocyclohexane (DCCH) supports a quadrupole-bound anion state, and that the cis -DCCH conformer forms a dipole-bound anion state. The electron binding energies of the quadrupole- and dipole-bound anions are measured as 18 and 115 meV, respectively, both of which are in excellent agreement with theoretical calculations by Sommerfeld. 

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4. The relativistic dipole and gravitational redshift on LSS

   https://doi.org/10.1088/1475-7516/2019/04/050  

   Dio, Enea Di; Seljak, Uroš (April 2019, Journal of Cosmology and Astroparticle Physics)
5. The transition dipole moment representation and spectral phasors

   https://doi.org/10.1117/12.2582780  

   Kline, Jessica; Dantus, Marcos (March 2021, SPIE BiOS, Multiphoton Microscopy in the Biomedical Sciences XXI)

   Periasamy, Ammasi; So, Peter T.; König, Karsten (Ed.)