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  Second-harmonic phonon spectroscopy of α-quartz

Winta, C., Gewinner, S., Schöllkopf, W., Wolf, M., & Paarmann, A. (2018). Second-harmonic phonon spectroscopy of α-quartz. Physical Review B, 97(9): 094108. doi:10.1103/PhysRevB.97.094108.

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PhysRevB.97.094108.pdf (Publisher version), 801KB
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PhysRevB.97.094108.pdf
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 Creators:
Winta, Christopher1, Author           
Gewinner, Sandy2, Author           
Schöllkopf, Wieland2, Author           
Wolf, Martin1, Author           
Paarmann, Alexander1, Author           
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1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
2Molecular Physics, Fritz Haber Institute, Max Planck Society, ou_634545              

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 Abstract: We demonstrate midinfrared second-harmonic generation as a highly sensitive phonon spectroscopy technique that we exemplify using α-quartz (SiO2) as a model system. A midinfrared free-electron laser provides direct access to optical phonon resonances ranging from 350 to 1400cm−1. While the extremely wide tunability and high peak fields of a free-electron laser promote nonlinear spectroscopic studies—complemented by simultaneous linear reflectivity measurements—azimuthal scans reveal crystallographic symmetry information of the sample. Additionally, temperature-dependent measurements show how damping rates increase, phonon modes shift spectrally and in certain cases disappear completely when approaching Tc=846K where quartz undergoes a structural phase transition from trigonal α-quartz to hexagonal β-quartz, demonstrating the technique's potential for studies of phase transitions.

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Language(s): eng - English
 Dates: 2017-10-062018-03-202018-03
 Publication Status: Issued
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevB.97.094108
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: 11 Volume / Issue: 97 (9) Sequence Number: 094108 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008