dc.contributor.author | Maznev, Alexei | |
dc.contributor.author | Hung, T.-C. | |
dc.contributor.author | Yao, Y.-T. | |
dc.contributor.author | Chou, T.-H. | |
dc.contributor.author | Gandhi, J. S. | |
dc.contributor.author | Lindsay, L. | |
dc.contributor.author | Shin, H. D. | |
dc.contributor.author | Stokes, D. W. | |
dc.contributor.author | Forrest, R. L. | |
dc.contributor.author | Bensaoula, A. | |
dc.contributor.author | Sun, C.-K. | |
dc.contributor.author | Nelson, Keith Adam | |
dc.date.accessioned | 2020-01-23T23:13:38Z | |
dc.date.available | 2020-01-23T23:13:38Z | |
dc.date.issued | 2018-02-06 | |
dc.date.submitted | 2017-10-10 | |
dc.identifier.issn | 0003-6951 | |
dc.identifier.issn | 1077-3118 | |
dc.identifier.uri | https://hdl.handle.net/1721.1/123669 | |
dc.description.abstract | We use femtosecond laser pulses to generate coherent longitudinal acoustic phonons at frequencies of 1-1.4 THz and study their propagation in GaN-based structures at room temperature. Two InGaN-GaN multiple-quantum-well (MQW) structures separated by a 2.3 μm-thick GaN spacer are used to simultaneously generate phonon wave packets with a central frequency determined by the period of the MQW and detect them after passing through the spacer. The measurements provide lower bounds for phonon lifetimes in GaN, which are still significantly lower than those from first principles predictions. The material Q-factor at 1 THz is found to be at least as high as 900. The measurements also demonstrate a partial specular reflection from the free surface of GaN at 1.4 THz. This work shows the potential of laser-based methods for THz range phonon spectroscopy and the promise for extending the viable frequency range of GaN-based acousto-electronic devices. | en_US |
dc.description.sponsorship | United States. Department of Energy. Office of Basic Energy Sciences (Award DE-FG02-00ER15087) | en_US |
dc.language.iso | en | |
dc.publisher | AIP Publishing LLC | en_US |
dc.relation.isversionof | https://doi.org/10.1063/1.5008852 | en_US |
dc.rights | Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. | en_US |
dc.source | Other repository | en_US |
dc.subject | Physics and Astronomy (miscellaneous) | en_US |
dc.title | Propagation of THz acoustic wave packets in GaN at room temperature | en_US |
dc.type | Article | en_US |
dc.identifier.citation | Maznev, Alexei et al. "Propagation of THz acoustic wave packets in GaN at room temperature." Applied Physics Letters, 112, 6, (February 2018): 061903 © 2018 Authors | en_US |
dc.contributor.department | Massachusetts Institute of Technology. Department of Chemistry | en_US |
dc.relation.journal | Applied Physics Letters | en_US |
dc.eprint.version | Final published version | en_US |
dc.type.uri | http://purl.org/eprint/type/JournalArticle | en_US |
eprint.status | http://purl.org/eprint/status/PeerReviewed | en_US |
dc.date.updated | 2019-12-30T19:03:17Z | |
dspace.date.submission | 2019-12-30T19:03:25Z | |
mit.journal.volume | 112 | en_US |
mit.journal.issue | 6 | en_US |
mit.metadata.status | Complete | |