|Title||Coulomb bound states of strongly interacting photons |
|Publication Type||Journal Article |
|Year of Publication||2015 |
|Authors||Maghrebi, MF, Gullans, M, Bienias, P, Choi, S, Martin, I, Firstenberg, O, Lukin, MD, Büchler, HP, Gorshkov, AV |
|Journal||Physical Review Letters |
|Date Published||2015/09/16 |
We show that two photons coupled to Rydberg states via electromagnetically
induced transparency can interact via an effective Coulomb potential. This
interaction gives rise to a continuum of two-body bound states. Within the
continuum, metastable bound states are distinguished in analogy with
quasi-bound states tunneling through a potential barrier. We find multiple
branches of metastable bound states whose energy spectrum is governed by the
Coulomb potential, thus obtaining a photonic analogue of the hydrogen atom.
Under certain conditions, the wavefunction resembles that of a diatomic
molecule in which the two polaritons are separated by a finite "bond length."
These states propagate with a negative group velocity in the medium, allowing
for a simple preparation and detection scheme, before they slowly decay to
pairs of bound Rydberg atoms.
|Short Title||Phys. Rev. Lett. |