Near-zero index(NZI)materials,i.e.,materials having a phase refractive index close to zero,are known to enhance or inhibit light-matter interactions.Most theoretical derivations of fundamental radiative processes rely on energetic considerations and detailed balance equations,but not on momentum considerations.Because momentum exchange should also be incorporated into theoretical models,we investigate momentum inside the three categories of NZI materials,i.e.,inside epsilon-and-mu-near-zero(EMNZ),epsilon-near-zero(ENZ)and mu-near-zero(MNZ)materials.In the context of Abraham-Minkowski debate in dispersive materials,we show that Minkowski-canonical momentum of light is zero inside all categories of NZI materials while Abraham-kinetic momentum of light is zero in ENZ and MNZ materials but nonzero inside EMNZ materials.We theoretically demonstrate that momentum recoil,transfer momentum from the field to the atom and Doppler shift are inhibited in NZI materials.Fundamental radiative processes inhibition is also explained due to those momentum considerations inside three-dimensional NZI materials.Absence of diffraction pattern in slits experiments is seen as a consequence of zero Minkowski momentum.Lastly,consequence on Heisenberg inequality,microscopy applications and on the canonical momentum as generator of translations are discussed.Those findings are appealing for a better understanding of fundamental light-matter interactions at the nanoscale as well as for lasing applications.

Micha?l Lobet;I?igo Liberal;Larissa Vertchenko;Andrei V.Lavrinenko;Nader Engheta;Eric Mazur

John A.Paulson School of Engineering and Applied Sciences,Harvard University,9 Oxford Street,Cambridge,MA 02138,USA;Department of Physics and Namur Institute of Structured Materials,University of Namur,Rue de Bruxelles 51,5000 Namur,Belgium;Electrical and Electronic Engineering Department,Universidad Publica de Navarra,Campus Arrosadía,Pamplona 31006,Spain;Department of Photonics Engineering,Technical University of Denmark,?rsteds Plads 345A,DK-2800 Kgs Lyngby,Denmark;Department of Electrical and Systems Engineering,University of Pennsylvania,Philadelphia,PA 19104,USA

光：科学与应用（英文版）

[1]Micha?l Lobet;I?igo Liberal;Larissa Vertchenko;Andrei V.Lavrinenko;Nader Engheta;Eric Mazur-.Momentum considerations inside near-zero index materials)[J].光：科学与应用（英文版）,2022(08):1782-1789

NZI,EMNZ

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