Cargando…
Distinguishing Optical and Acoustic Phonon Temperatures and Their Energy Coupling Factor under Photon Excitation in nm 2D Materials
Under photon excitation, 2D materials experience cascading energy transfer from electrons to optical phonons (OPs) and acoustic phonons (APs). Despite few modeling works, it remains a long‐history open problem to distinguish the OP and AP temperatures, not to mention characterizing their energy coup...
Autores principales: | , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley and Sons Inc.
2020
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7341092/ https://www.ncbi.nlm.nih.gov/pubmed/32670758 http://dx.doi.org/10.1002/advs.202000097 |
_version_ | 1783555161269993472 |
---|---|
author | Wang, Ridong Zobeiri, Hamidreza Xie, Yangsu Wang, Xinwei Zhang, Xing Yue, Yanan |
author_facet | Wang, Ridong Zobeiri, Hamidreza Xie, Yangsu Wang, Xinwei Zhang, Xing Yue, Yanan |
author_sort | Wang, Ridong |
collection | PubMed |
description | Under photon excitation, 2D materials experience cascading energy transfer from electrons to optical phonons (OPs) and acoustic phonons (APs). Despite few modeling works, it remains a long‐history open problem to distinguish the OP and AP temperatures, not to mention characterizing their energy coupling factor (G). Here, the temperatures of longitudinal/transverse optical (LO/TO) phonons, flexural optical (ZO) phonons, and APs are distinguished by constructing steady and nanosecond (ns) interphonon branch energy transport states and simultaneously probing them using nanosecond energy transport state‐resolved Raman spectroscopy. ΔT (OP −AP) is measured to take more than 30% of the Raman‐probed temperature rise. A breakthrough is made on measuring the intrinsic in‐plane thermal conductivity of suspended nm MoS(2) and MoSe(2) by completely excluding the interphonon cascading energy transfer effect, rewriting the Raman‐based thermal conductivity measurement of 2D materials. G (OP↔AP) for MoS(2), MoSe(2), and graphene paper (GP) are characterized. For MoS(2) and MoSe(2), G (OP↔AP) is in the order of 10(15) and 10(14) W m(−3) K(−1) and G (ZO↔AP) is much smaller than G (LO/TO↔AP). Under ns laser excitation, G (OP↔AP) is significantly increased, probably due to the reduced phonon scattering time by the significantly increased hot carrier population. For GP, G (LO/TO↔AP) is 0.549 × 10(16) W m(−3) K(−1), agreeing well with the value of 0.41 × 10(16) W m(−3) K(−1) by first‐principles modeling. |
format | Online Article Text |
id | pubmed-7341092 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | John Wiley and Sons Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-73410922020-07-14 Distinguishing Optical and Acoustic Phonon Temperatures and Their Energy Coupling Factor under Photon Excitation in nm 2D Materials Wang, Ridong Zobeiri, Hamidreza Xie, Yangsu Wang, Xinwei Zhang, Xing Yue, Yanan Adv Sci (Weinh) Full Papers Under photon excitation, 2D materials experience cascading energy transfer from electrons to optical phonons (OPs) and acoustic phonons (APs). Despite few modeling works, it remains a long‐history open problem to distinguish the OP and AP temperatures, not to mention characterizing their energy coupling factor (G). Here, the temperatures of longitudinal/transverse optical (LO/TO) phonons, flexural optical (ZO) phonons, and APs are distinguished by constructing steady and nanosecond (ns) interphonon branch energy transport states and simultaneously probing them using nanosecond energy transport state‐resolved Raman spectroscopy. ΔT (OP −AP) is measured to take more than 30% of the Raman‐probed temperature rise. A breakthrough is made on measuring the intrinsic in‐plane thermal conductivity of suspended nm MoS(2) and MoSe(2) by completely excluding the interphonon cascading energy transfer effect, rewriting the Raman‐based thermal conductivity measurement of 2D materials. G (OP↔AP) for MoS(2), MoSe(2), and graphene paper (GP) are characterized. For MoS(2) and MoSe(2), G (OP↔AP) is in the order of 10(15) and 10(14) W m(−3) K(−1) and G (ZO↔AP) is much smaller than G (LO/TO↔AP). Under ns laser excitation, G (OP↔AP) is significantly increased, probably due to the reduced phonon scattering time by the significantly increased hot carrier population. For GP, G (LO/TO↔AP) is 0.549 × 10(16) W m(−3) K(−1), agreeing well with the value of 0.41 × 10(16) W m(−3) K(−1) by first‐principles modeling. John Wiley and Sons Inc. 2020-05-26 /pmc/articles/PMC7341092/ /pubmed/32670758 http://dx.doi.org/10.1002/advs.202000097 Text en © 2020 The Authors. Published by WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Full Papers Wang, Ridong Zobeiri, Hamidreza Xie, Yangsu Wang, Xinwei Zhang, Xing Yue, Yanan Distinguishing Optical and Acoustic Phonon Temperatures and Their Energy Coupling Factor under Photon Excitation in nm 2D Materials |
title | Distinguishing Optical and Acoustic Phonon Temperatures and Their Energy Coupling Factor under Photon Excitation in nm 2D Materials |
title_full | Distinguishing Optical and Acoustic Phonon Temperatures and Their Energy Coupling Factor under Photon Excitation in nm 2D Materials |
title_fullStr | Distinguishing Optical and Acoustic Phonon Temperatures and Their Energy Coupling Factor under Photon Excitation in nm 2D Materials |
title_full_unstemmed | Distinguishing Optical and Acoustic Phonon Temperatures and Their Energy Coupling Factor under Photon Excitation in nm 2D Materials |
title_short | Distinguishing Optical and Acoustic Phonon Temperatures and Their Energy Coupling Factor under Photon Excitation in nm 2D Materials |
title_sort | distinguishing optical and acoustic phonon temperatures and their energy coupling factor under photon excitation in nm 2d materials |
topic | Full Papers |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7341092/ https://www.ncbi.nlm.nih.gov/pubmed/32670758 http://dx.doi.org/10.1002/advs.202000097 |
work_keys_str_mv | AT wangridong distinguishingopticalandacousticphonontemperaturesandtheirenergycouplingfactorunderphotonexcitationinnm2dmaterials AT zobeirihamidreza distinguishingopticalandacousticphonontemperaturesandtheirenergycouplingfactorunderphotonexcitationinnm2dmaterials AT xieyangsu distinguishingopticalandacousticphonontemperaturesandtheirenergycouplingfactorunderphotonexcitationinnm2dmaterials AT wangxinwei distinguishingopticalandacousticphonontemperaturesandtheirenergycouplingfactorunderphotonexcitationinnm2dmaterials AT zhangxing distinguishingopticalandacousticphonontemperaturesandtheirenergycouplingfactorunderphotonexcitationinnm2dmaterials AT yueyanan distinguishingopticalandacousticphonontemperaturesandtheirenergycouplingfactorunderphotonexcitationinnm2dmaterials |