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Conference Paper: Atomic simulations of nonlinear lattice dynamics in PbTe
Title | Atomic simulations of nonlinear lattice dynamics in PbTe |
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Authors | |
Issue Date | 2014 |
Publisher | American Physical Society. The Journal's web site is located at http://www.aps.org/meetings/baps/ |
Citation | American Physical Society (APS) March Meeting, Denver, Colorado, USA, 3-7 March 2014. In American Physical Society Bulletin, 2014, v. 59 n. 1, p. abstract no. M16.006 How to Cite? |
Abstract | PbTe is of great interest as a thermoelectric material and for displaying signs of strong phonon interactions. Inelastic neutron scattering experiments reveal a signature of strong anharmonicity as evidenced in anomalous temperature dependence of the phonon spectra. Here we perform molecular dynamic simulations using a 4th-order interatomic potential deduced from first-principles calculations. The temperature dependent phonon spectra are successfully reproduced from first-principles for the first time. The emergence of a new mode at the zone center is unambiguously shown, as observed in experiment. Furthermore, we confirm that there is not a local spontaneously broken symmetry, clarifying recent controversy among experimental results. Phonon self-energies at different temperatures are computed to show the origin of the phonon anomalies. |
Description | Session M16: Focus Session: Computational Studies of Thermoelectric Materials |
Persistent Identifier | http://hdl.handle.net/10722/243992 |
ISSN |
DC Field | Value | Language |
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dc.contributor.author | Chen, Y | - |
dc.contributor.author | Marianetti, CA | - |
dc.date.accessioned | 2017-08-25T03:02:14Z | - |
dc.date.available | 2017-08-25T03:02:14Z | - |
dc.date.issued | 2014 | - |
dc.identifier.citation | American Physical Society (APS) March Meeting, Denver, Colorado, USA, 3-7 March 2014. In American Physical Society Bulletin, 2014, v. 59 n. 1, p. abstract no. M16.006 | - |
dc.identifier.issn | 0003-0503 | - |
dc.identifier.uri | http://hdl.handle.net/10722/243992 | - |
dc.description | Session M16: Focus Session: Computational Studies of Thermoelectric Materials | - |
dc.description.abstract | PbTe is of great interest as a thermoelectric material and for displaying signs of strong phonon interactions. Inelastic neutron scattering experiments reveal a signature of strong anharmonicity as evidenced in anomalous temperature dependence of the phonon spectra. Here we perform molecular dynamic simulations using a 4th-order interatomic potential deduced from first-principles calculations. The temperature dependent phonon spectra are successfully reproduced from first-principles for the first time. The emergence of a new mode at the zone center is unambiguously shown, as observed in experiment. Furthermore, we confirm that there is not a local spontaneously broken symmetry, clarifying recent controversy among experimental results. Phonon self-energies at different temperatures are computed to show the origin of the phonon anomalies. | - |
dc.language | eng | - |
dc.publisher | American Physical Society. The Journal's web site is located at http://www.aps.org/meetings/baps/ | - |
dc.relation.ispartof | American Physical Society Bulletin | - |
dc.title | Atomic simulations of nonlinear lattice dynamics in PbTe | - |
dc.type | Conference_Paper | - |
dc.identifier.email | Chen, Y: yuechen@hku.hk | - |
dc.identifier.authority | Chen, Y=rp01925 | - |
dc.identifier.hkuros | 275519 | - |
dc.identifier.volume | 59 | - |
dc.identifier.issue | 1 | - |
dc.identifier.spage | abstract no. M16.006 | - |
dc.identifier.epage | abstract no. M16.006 | - |
dc.publisher.place | United States | - |
dc.identifier.issnl | 0003-0503 | - |