Carrete, JesúsWu, LiLindsay, LucasBroido, David A.Gallego del Hoyo, Luis JavierMingo, Natalio2020-06-052020-06-052016Jesús Carrete, Wu Li, Lucas Lindsay, David A. Broido, Luis J. Gallego & Natalio Mingo (2016) Physically founded phonon dispersions of few-layer materials and the case of borophene, Materials Research Letters, 4:4, 204-211, DOI: 10.1080/21663831.2016.11741632166-3831http://hdl.handle.net/10347/22790By building physically sound interatomic force constants, we offer evidence of the universal presence of a quadratic phonon branch in all unstrained 2D materials, thus contradicting much of the existing literature. Through a reformulation of the interatomic force constants (IFCs) in terms of internal coordinates, we find that a delicate balance between the IFCs is responsible for this quadraticity. We use this approach to predict the thermal conductivity of Pmmn borophene, which is comparable to that of , and displays a remarkable in-plane anisotropy. These qualities may enable the efficient heat management of borophene devices in potential nanoelectronic applications.eng© 2016 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly citedhttp://creativecommons.org/licenses/by/4.0/2DThermal TransportBoropheneNanomaterialsPhononsjournal article10.1080/21663831.2016.1174163open access