Out-of-plane heat transfer in van der Waals stacks through electron–hyperbolic phonon coupling

Alessandro Principi, Klaas-Jan Tielrooij, Niels C.H. Hesp, Mark B. Lundeberg, Eva A A Pogna, Luca Banszerus, Zoltan Mics, Mathieu Massicotte, Peter Schmidt, Diana Davydovskaya, D. Purdie, Ilya Goykhman, Giancarlo Soavi, Antonio Lombardo, K. Watanabe, Takashi Taniguchi, Mischa Bonn, Dmitry Turchinovich, Christoph Stampfer, A FerrariGiulio Cerullo, Marco Polini, Frank H.L. Koppens

Research output: Contribution to journalArticlepeer-review

Abstract

Van der Waals heterostructures have emerged as promising building blocks that offer access to new physics, novel device functionalities and superior electrical and optoelectronic properties. Applications such as thermal management, photodetection, light emission, data communication, high-speed electronics and light harvesting require a thorough understanding of (nanoscale) heat flow. Here, using time-resolved photocurrent measurements, we identify an efficient out-of-plane energy transfer channel, where charge carriers in graphene couple to hyperbolic phonon polaritons in the encapsulating layered material. This hyperbolic cooling is particularly efficient, giving picosecond cooling times for hexagonal BN, where the high-momentum hyperbolic phonon polaritons enable efficient near-field energy transfer. We study this heat transfer mechanism using distinct control knobs to vary carrier density and lattice temperature, and find excellent agreement with theory without any adjustable parameters. These insights may lead to the ability to control heat flow in van der Waals heterostructures.
Original languageEnglish
Pages (from-to)41-46
Number of pages6
JournalNature Nanotechnology
Volume13
Issue number1
Early online date27 Nov 2017
DOIs
Publication statusPublished - Jan 2018

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