Journal article
Phonon engineering of boron nitride via isotopic enrichment
Journal of materials research, Vol.36(21), pp.4394-4403
11/14/2021
DOI: 10.1557/s43578-021-00426-9
Abstract
Phonon polaritons (PhPs) enable a variety of applications, yet it requires PhPs supported in the desired frequency range. The two BN allotropes (cubic and hexagonal, cBN and hBN) are of particular interest, as their optic phonons fall within the so-called molecular-fingerprint region (similar to 1000-1610 cm(-1)). However, there remains a spectral gap between PhPs covered by these two, limiting applications. Thus, we isotopically engineered hBN and cBN and examined the optic phonons. For hBN, enhancement of the optic phonon lifetimes and shifted frequencies are observed. However, lifetimes are observed to decrease with the enrichment of cBN by B-10, B-11, and N-15. We propose that the reduced lifetimes are not due to intrinsic loss, but rather increased defect concentrations resulting from the modified growth, supported by first-principles calculations. Thus, reducing the extrinsic defects in isotopically engineered cBN may present a path toward overcoming these restrictions for applications in the molecular-fingerprint region.
Details
- Title: Subtitle
- Phonon engineering of boron nitride via isotopic enrichment
- Creators
- Mingze He - Vanderbilt UniversityLucas Lindsay - Oak Ridge National LaboratoryThomas E. Beechem - Center for Integrated NanotechnologiesThomas Folland - University of IowaJoseph Matson - Vanderbilt UniversityKenji Watanabe - National Institute for Materials ScienceAndrey Zavalin - Fisk UniversityAkira Ueda - Fisk UniversityWarren E. Collins - Fisk UniversityTakashi Taniguchi - National Institute for Materials ScienceJoshua D. Caldwell - Vanderbilt University
- Resource Type
- Journal article
- Publication Details
- Journal of materials research, Vol.36(21), pp.4394-4403
- DOI
- 10.1557/s43578-021-00426-9
- ISSN
- 0884-2914
- eISSN
- 2044-5326
- Publisher
- Springer Nature
- Number of pages
- 10
- Grant note
- N00014-18-12107 / Office of Naval Research Grant; Office of Naval Research US Department of Energy, Office of Science, Office of Basic Energy Sciences, Material Sciences and Engineering Division; United States Department of Energy (DOE) 1904793 / National Science Foundation, Division of Materials Research; National Science Foundation (NSF) DE-AC02-05CH11231 / Office of Science of the US Department of Energy; United States Department of Energy (DOE) DE-NA-0003525 / US DOE's National Nuclear Security Administration; National Nuclear Security Administration JPMXP0112101001; JP20H00354 / Elemental Strategy Initiative by the MEXT, Japan Vanderbilt University
- Language
- English
- Date published
- 11/14/2021
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984428804402771
Metrics
21 Record Views