Light controlled THz plasmonic time varying media: momentum gaps, entangled plasmon pairs, and pulse induced time reversal

TL;DR

This paper introduces a Floquet engineering approach using high-frequency light to control THz plasmons, enabling novel phenomena like momentum gaps, entangled pairs, and time reversal in 2D Dirac systems.

Contribution

It presents a new framework for manipulating THz plasmons with light, achieving effects previously unattainable without direct THz excitation.

Findings

Coherent excitation and manipulation of low-frequency plasmons without THz light

Generation of momentum-gapped plasmonic band structures

Creation of entangled plasmon pairs and time-reversed wave packets

Abstract

This letter establishes a Floquet engineering framework in which coherent high frequency light with a time dependent amplitude can be used to parametrically excite and amplify THz plasmons, mirror plasmonic wave packets in time, generate momemtum-gapped plasmonic band structures, entangled plasmon pairs, and THz radiation in two dimensional Dirac systems. Our results show how low frequency plasmons can be coherently excited and manipulated without the need for THz light.