Ultrafast relaxation of hot phonons in graphene-hBN heterostructures | Zendy

Dheeraj Golla | Zendy; Alexandra Brasington | Zendy; Brian J. LeRoy | Zendy; Arvinder Sandhu | Zendy

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Ultrafast relaxation of hot phonons in graphene-hBN heterostructures

Author(s) -

Dheeraj Golla,

Alexandra Brasington,

Brian J. LeRoy,

Arvinder Sandhu

Publication year - 2017

Publication title -

apl materials

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.571

H-Index - 60

ISSN - 2166-532X

DOI - 10.1063/1.4982738

Subject(s) - graphene , materials science , phonon , heterojunction , optoelectronics , ultrashort pulse , substrate (aquarium) , electron mobility , relaxation (psychology) , silicon , condensed matter physics , nanotechnology , optics , laser , psychology , social psychology , oceanography , physics , geology

Fast carrier cooling is important for high power graphene based devices. Strongly coupled optical phonons play a major role in the relaxation of photo-excited carriers in graphene. Heterostructures of graphene and hexagonal boron nitride (hBN) have shown exceptional mobility and high saturation current, which makes them ideal for applications, but the effect of the hBN substrate on carrier cooling mechanisms is not understood. We track the cooling of hot photo-excited carriers in graphene-hBN heterostructures using ultrafast pump-probe spectroscopy. We find that the carriers cool down four times faster in the case of graphene on hBN than on a silicon oxide substrate thus overcoming the hot phonon bottleneck that plagues cooling in graphene devices. (C) 2017 Author(s)

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