title: Tunable Light-Matter Interaction and the Role of Hyperbolicity in Graphene-hBN System.
abstract: Hexagonal boron nitride (hBN) is a natural hyperbolic material, which can also accommodate highly dispersive surface phonon-polariton modes. In this paper, we examine theoretically the mid-infrared optical properties of graphene-hBN heterostructures derived from their coupled plasmon-phonon modes. We find that the graphene plasmon couples differently with the phonons of the two Reststrahlen bands, owing to their different hyperbolicity. This also leads to distinctively different interaction between an external quantum emitter and the plasmon-phonon modes in the two bands, leading to substantial modification of its spectrum. The coupling to graphene plasmons allows for additional gate tunability in the Purcell factor and narrow dips in its emission spectra.
authors.affiliation: †Mechanical Engineering Department, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.
authors.forename: Anshuman
authors.initials: A
authors.lastname: Kumar
authors.affiliation: ‡IBM T.J. Watson Research Center, 1101 Kitchawan Road, Yorktown Heights, New York 10598, United States.
authors.forename: Tony
authors.initials: T
authors.lastname: Low
authors.affiliation: ¶Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, China.
authors.forename: Kin Hung
authors.initials: KH
authors.lastname: Fung
authors.affiliation: ‡IBM T.J. Watson Research Center, 1101 Kitchawan Road, Yorktown Heights, New York 10598, United States.
authors.forename: Phaedon
authors.initials: P
authors.lastname: Avouris
authors.affiliation: †Mechanical Engineering Department, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.
authors.forename: Nicholas X
authors.initials: NX
authors.lastname: Fang
keywords: Plasmonics; graphene; hBN; hyperbolic metamaterials; phonons