Phonon pressure coefficients and deformation potentials of wurtzite AlN determined by uniaxial pressure-dependent Raman measurements

Callsen, G; Wagner, MR; Reparaz, JS; Nippert, F; Kure, T; Kalinowski, S; Hoffmann, A; Ford, MJ; Phillips, MR; Dalmau, RF; Schlesser, R; Collazo, R; Sitar, Z

Phonon pressure coefficients and deformation potentials of wurtzite AlN determined by uniaxial pressure-dependent Raman measurements

Callsen, G Wagner, MR Reparaz, JS Nippert, F Kure, T Kalinowski, S Hoffmann, A Ford, MJ

Phillips, MR

Dalmau, RF Schlesser, R Collazo, R Sitar, Z

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Publication Type:: Journal Article
Citation:: Physical Review B - Condensed Matter and Materials Physics, 2014, 90 (20)
Issue Date:: 2014-11-07

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Field	Value	Language
dc.contributor.author	Callsen, G	en_US
dc.contributor.author	Wagner, MR	en_US
dc.contributor.author	Reparaz, JS	en_US
dc.contributor.author	Nippert, F	en_US
dc.contributor.author	Kure, T	en_US
dc.contributor.author	Kalinowski, S	en_US
dc.contributor.author	Hoffmann, A	en_US
dc.contributor.author	Ford, MJ https://orcid.org/0000-0002-8595-5900	en_US
dc.contributor.author	Phillips, MR https://orcid.org/0000-0003-1522-9281	en_US
dc.contributor.author	Dalmau, RF	en_US
dc.contributor.author	Schlesser, R	en_US
dc.contributor.author	Collazo, R	en_US
dc.contributor.author	Sitar, Z	en_US
dc.date.issued	2014-11-07	en_US
dc.identifier.citation	Physical Review B - Condensed Matter and Materials Physics, 2014, 90 (20)	en_US
dc.identifier.issn	1098-0121	en_US
dc.identifier.uri	http://hdl.handle.net/10453/32778
dc.description.abstract	© 2014 American Physical Society. We studied bulk crystals of wurtzite AlN by means of uniaxial pressure-dependent Raman measurements. As a result, we derive the phonon pressure coefficients and deformation potentials for all zone center optical phonon modes. For the A1 and E1 modes, we further experimentally determined the uniaxial pressure dependence of their longitudinal optical-transverse optical (LO-TO) splittings. Our experimental approach delivers new insight into the large variance among previously reported phonon deformation potentials, which are predominantly based on heteroepitaxial growth of AlN and the ball-on-ring technique. Additionally, the measured phonon pressure coefficients are compared to their theoretical counterparts obtained by density functional theory implemented in the siesta package. Generally, we observe a good agreement between the calculated and measured phonon pressure coefficients but some particular Raman modes exhibit significant discrepancies similar to the case of wurtzite GaN and ZnO, clearly motivating the presented uniaxial pressure-dependent Raman measurements on bulk AlN crystals.	en_US
dc.relation.ispartof	Physical Review B - Condensed Matter and Materials Physics	en_US
dc.relation.isbasedon	10.1103/PhysRevB.90.205206	en_US
dc.subject.classification	Fluids & Plasmas	en_US
dc.title	Phonon pressure coefficients and deformation potentials of wurtzite AlN determined by uniaxial pressure-dependent Raman measurements	en_US
dc.type	Journal Article
utslib.citation.volume	20	en_US
utslib.citation.volume	90	en_US
utslib.for	0204 Condensed Matter Physics	en_US
utslib.for	02 Physical Sciences	en_US
utslib.for	03 Chemical Sciences	en_US
utslib.for	09 Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/DVC (Research)
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - CCET - Centre for Clean Energy Technology
utslib.copyright.status	open_access
pubs.issue	20	en_US
pubs.publication-status	Published	en_US
pubs.volume	90	en_US

Abstract:

© 2014 American Physical Society. We studied bulk crystals of wurtzite AlN by means of uniaxial pressure-dependent Raman measurements. As a result, we derive the phonon pressure coefficients and deformation potentials for all zone center optical phonon modes. For the A1 and E1 modes, we further experimentally determined the uniaxial pressure dependence of their longitudinal optical-transverse optical (LO-TO) splittings. Our experimental approach delivers new insight into the large variance among previously reported phonon deformation potentials, which are predominantly based on heteroepitaxial growth of AlN and the ball-on-ring technique. Additionally, the measured phonon pressure coefficients are compared to their theoretical counterparts obtained by density functional theory implemented in the siesta package. Generally, we observe a good agreement between the calculated and measured phonon pressure coefficients but some particular Raman modes exhibit significant discrepancies similar to the case of wurtzite GaN and ZnO, clearly motivating the presented uniaxial pressure-dependent Raman measurements on bulk AlN crystals.

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http://hdl.handle.net/10453/32778