Ultra-slow Recombination Of Carriers At Low Density And Energy In Neutral Graphene-hBN Van Der Waals Heterostructures

Invited Keynote talk (MM18)

Fri, 13 Nov 2020 12:00am to 12:30am

Room: Canalside

Attend in Zoom

We report on carrier lifetimes in graphene/hBN heterostructures of 30 ps for photoexcited carriers at low density and energy, using mid-infrared photoconductivity measurements. We further demonstrate the switching of carrier lifetime from 30 ps (attributed to interband Auger) down to a few picoseconds upon ignition of hyperbolic phonon polaritons relaxation at finite bias and/or with infrared excitation power. Our study opens interesting perspectives to exploit graphene/hBN heterostructures for THz lasing and highly sensitive THz photodetection as well as for phonon polariton optics.

Presenters and Authors Info

Presenter: Anonymous

Authors: Mangeney, Juliette; Huang, Panhui; Riccardi, Elisa; Messelot, Simon; Graef, Holger; Valmorra, Federico; Tignon, Jerome; Taniguchi, Takashi; Watanabe, Kenji; Dhillon, Sukhdeep; Pla├žais, Bernard; Ferreira, Robson

Advanced Materials Laboratory, LPENS