Study of confined coherent acoustic phonon modes in a free-standing cubic GaN membrane by femtosecond spectroscopy

Chuan He; Martin Grossmann; Delia Brick; Martin Schubert; Sergei V. Novikov; C. Thomas Foxon; Vitalyi Gusev; Anthony J. Kent; Thomas Dekorsy

doi:10.1063/1.4931495

Study of confined coherent acoustic phonon modes in a free-standing cubic GaN membrane by femtosecond spectroscopy

Chuan He^*, Martin Grossmann, Delia Brick, Martin Schubert, Sergei V. Novikov, C. Thomas Foxon, Vitalyi Gusev, Anthony J. Kent, Thomas Dekorsy

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

Confined longitudinal coherent acoustic phonon modes are excited and detected in a sub-μm-thick free-standing cubic GaN membrane by femtosecond pump-probe spectroscopy. After fs laser excitation, Brillouin oscillation and thickness oscillation with frequencies up to 100 GHz are observed and studied in the time domain. We found an initial expansion of the membrane upon optical excitation at 400nm. Our experimental results confirmed earlier existing theoretical predictions and experimental observations that the hydrostatic deformation potential of cubic GaN is positive.

Original language	English
Article number	112105
Journal	Applied Physics Letters
Volume	107
Issue number	11
DOIs	https://doi.org/10.1063/1.4931495
Publication status	Published - 14 Sept 2015
Externally published	Yes

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title = "Study of confined coherent acoustic phonon modes in a free-standing cubic GaN membrane by femtosecond spectroscopy",

abstract = "Confined longitudinal coherent acoustic phonon modes are excited and detected in a sub-μm-thick free-standing cubic GaN membrane by femtosecond pump-probe spectroscopy. After fs laser excitation, Brillouin oscillation and thickness oscillation with frequencies up to 100 GHz are observed and studied in the time domain. We found an initial expansion of the membrane upon optical excitation at 400nm. Our experimental results confirmed earlier existing theoretical predictions and experimental observations that the hydrostatic deformation potential of cubic GaN is positive.",

author = "Chuan He and Martin Grossmann and Delia Brick and Martin Schubert and Novikov, {Sergei V.} and {Thomas Foxon}, C. and Vitalyi Gusev and Kent, {Anthony J.} and Thomas Dekorsy",

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T1 - Study of confined coherent acoustic phonon modes in a free-standing cubic GaN membrane by femtosecond spectroscopy

AU - He, Chuan

AU - Grossmann, Martin

AU - Brick, Delia

AU - Schubert, Martin

AU - Novikov, Sergei V.

AU - Thomas Foxon, C.

AU - Gusev, Vitalyi

AU - Kent, Anthony J.

AU - Dekorsy, Thomas

PY - 2015/9/14

Y1 - 2015/9/14

N2 - Confined longitudinal coherent acoustic phonon modes are excited and detected in a sub-μm-thick free-standing cubic GaN membrane by femtosecond pump-probe spectroscopy. After fs laser excitation, Brillouin oscillation and thickness oscillation with frequencies up to 100 GHz are observed and studied in the time domain. We found an initial expansion of the membrane upon optical excitation at 400nm. Our experimental results confirmed earlier existing theoretical predictions and experimental observations that the hydrostatic deformation potential of cubic GaN is positive.

AB - Confined longitudinal coherent acoustic phonon modes are excited and detected in a sub-μm-thick free-standing cubic GaN membrane by femtosecond pump-probe spectroscopy. After fs laser excitation, Brillouin oscillation and thickness oscillation with frequencies up to 100 GHz are observed and studied in the time domain. We found an initial expansion of the membrane upon optical excitation at 400nm. Our experimental results confirmed earlier existing theoretical predictions and experimental observations that the hydrostatic deformation potential of cubic GaN is positive.

UR - http://www.scopus.com/inward/record.url?scp=84941992073&partnerID=8YFLogxK

U2 - 10.1063/1.4931495

DO - 10.1063/1.4931495

M3 - Article

AN - SCOPUS:84941992073

SN - 0003-6951

VL - 107

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 11

M1 - 112105

ER -

Study of confined coherent acoustic phonon modes in a free-standing cubic GaN membrane by femtosecond spectroscopy

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