Universität zu Köln

Machida, Yo, Subedi, Alaska ORCID: 0000-0001-7537-8196, Akiba, Kazuto, Miyake, Atsushi ORCID: 0000-0003-2941-9326, Tokunaga, Masashi ORCID: 0000-0002-1401-9381, Akahama, Yuichi, Izawa, Koichi and Behnia, Kamran ORCID: 0000-0001-8997-5645 (2018). Observation of Poiseuille flow of phonons in black phosphorus. Sci. Adv., 4 (6). WASHINGTON: AMER ASSOC ADVANCEMENT SCIENCE. ISSN 2375-2548

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Abstract

The travel of heat in insulators is commonly pictured as a flow of phonons scattered along their individual trajectory. In rare circumstances, momentum-conserving collision events dominate, and thermal transport becomes hydrodynamic. One of these cases, dubbed the Poiseuille flow of phonons, can occur in a temperature window just below the peak temperature of thermal conductivity. We report on a study of heat flow in bulk black phosphorus between 0.1 and 80 K. We find a thermal conductivity showing a faster than cubic temperature dependence between 5 and 12 K. Consequently, the effective phonon mean free path shows a nonmonotonic temperature dependence at the onset of the ballistic regime, with a size-dependent Knudsen minimum. These are hallmarks of Poiseuille flow previously observed in a handful of solids. Comparing the phonon dispersion in black phosphorus and silicon, we show that the phase space for normal scattering events in black phosphorus is much larger. Our results imply that the most important requirement for the emergence of Poiseuille flow is the facility of momentum exchange between acoustic phonon branches. Proximity to a structural transition can be beneficial for the emergence of this behavior in clean systems, even when they do not exceed silicon in purity.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Machida, Yo UNSPECIFIED UNSPECIFIED UNSPECIFIED Subedi, Alaska UNSPECIFIED orcid.org/0000-0001-7537-8196 UNSPECIFIED Akiba, Kazuto UNSPECIFIED UNSPECIFIED UNSPECIFIED Miyake, Atsushi UNSPECIFIED orcid.org/0000-0003-2941-9326 UNSPECIFIED Tokunaga, Masashi UNSPECIFIED orcid.org/0000-0002-1401-9381 UNSPECIFIED Akahama, Yuichi UNSPECIFIED UNSPECIFIED UNSPECIFIED Izawa, Koichi UNSPECIFIED UNSPECIFIED UNSPECIFIED Behnia, Kamran UNSPECIFIED orcid.org/0000-0001-8997-5645 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-183724
DOI:	10.1126/sciadv.aat3374
Journal or Publication Title:	Sci. Adv.
Volume:	4
Number:	6
Date:	2018
Publisher:	AMER ASSOC ADVANCEMENT SCIENCE
Place of Publication:	WASHINGTON
ISSN:	2375-2548
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language THERMAL-CONDUCTIVITY; SECOND SOUND; TRANSPORT; HEAT; HYDRODYNAMICS; EXCITATIONS; CRYSTALS; BISMUTH; LATTICE Multiple languages Multidisciplinary Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/18372