Graphene as a source of entangled plasmons
- URL: http://arxiv.org/abs/2110.14917v2
- Date: Wed, 15 Jun 2022 20:19:14 GMT
- Title: Graphene as a source of entangled plasmons
- Authors: Zhiyuan Sun, D. N. Basov, M. M. Fogler
- Abstract summary: We analyze schemes for generating pairs of quantum entangled plasmons in the terahertz-infrared range in graphene.
We predict that high plasmonic field concentration and strong optical nonlinearity of monolayer graphene enables pair-generation rates much higher than those of conventional photonic sources.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We analyze nonlinear optics schemes for generating pairs of quantum entangled
plasmons in the terahertz-infrared range in graphene. We predict that high
plasmonic field concentration and strong optical nonlinearity of monolayer
graphene enables pair-generation rates much higher than those of conventional
photonic sources. The first scheme we study is spontaneous parametric down
conversion in a graphene nanoribbon. In this second-order nonlinear process a
plasmon excited by an external pump splits into a pair of plasmons, of half the
original frequency each, emitted in opposite directions. The conversion is
activated by applying a dc electric field that induces a density gradient or a
current across the ribbon. Another scheme is degenerate four-wave mixing where
the counter-propagating plasmons are emitted at the pump frequency. This
third-order nonlinear process does not require a symmetry-breaking dc field. We
suggest nano-optical experiments for measuring position-momentum entanglement
of the emitted plasmon pairs. We estimate the critical pump fields at which the
plasmon generation rates exceed their dissipation, leading to parametric
instabilities.
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