Coherent longitudinal optical phonon and plasmon coupling in the near-surface region of InN

Y. M. Chang; C. T. Chuang; C. T. Chia; K. T. Tsen; H. Lu; W. J. Schaff

doi:10.1063/1.1830077

Coherent longitudinal optical phonon and plasmon coupling in the near-surface region of InN

Y. M. Chang^*, C. T. Chuang, C. T. Chia, K. T. Tsen, H. Lu, W. J. Schaff

^*Corresponding author for this work

Department of Physics

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

21 Citations (Scopus)

Abstract

Coherent phonon spectroscopy of a high-quality InN epitaxial layer is carried out using time-resolved second-harmonic generation. A coherent longitudinal optical phonon and plasmon coupling mode only at 447 cm ^-1 can be resolved in the spectrum. Its frequency shows no dependence on the photoinjected carrier density up to 1.5 × 10 ¹⁹ cm ^-3. This phenomenon is attributed to the hybridization of a coherent A ₁(LO) phonon with the intrinsic cold plasma accumulated in the near-surface region of InN, where the plasma density could reach on the order of 10 ²⁰ cm ^-3, much higher than the bulk carrier concentration 1 × 10 ¹⁸ cm ^-3 determined by Hall effect measurement.

Original language	English
Article number	3
Pages (from-to)	5224-5226
Number of pages	3
Journal	Applied Physics Letters
Volume	85
Issue number	22
DOIs	https://doi.org/10.1063/1.1830077
Publication status	Published - 2004 Nov 29

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.1830077

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title = "Coherent longitudinal optical phonon and plasmon coupling in the near-surface region of InN",

abstract = "Coherent phonon spectroscopy of a high-quality InN epitaxial layer is carried out using time-resolved second-harmonic generation. A coherent longitudinal optical phonon and plasmon coupling mode only at 447 cm -1 can be resolved in the spectrum. Its frequency shows no dependence on the photoinjected carrier density up to 1.5 × 10 19 cm -3. This phenomenon is attributed to the hybridization of a coherent A 1(LO) phonon with the intrinsic cold plasma accumulated in the near-surface region of InN, where the plasma density could reach on the order of 10 20 cm -3, much higher than the bulk carrier concentration 1 × 10 18 cm -3 determined by Hall effect measurement.",

author = "Chang, {Y. M.} and Chuang, {C. T.} and Chia, {C. T.} and Tsen, {K. T.} and H. Lu and Schaff, {W. J.}",

note = "Funding Information: One of the authors (Y.-M.C.) acknowledges the financial support of the National Science Council and Academia Sinica of Taiwan. The work at ASU is supported by the National Science Foundation under Grant No. DMR-0305147. The work at Cornell University is supported by ONR Contract No. N000149910936 monitored by Dr. Colin Wood and a LBNL Subcontract No. 6703635. They also wish to acknowledge the technical assistance of Mark Little and Troy Richardson.",

year = "2004",

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doi = "10.1063/1.1830077",

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T1 - Coherent longitudinal optical phonon and plasmon coupling in the near-surface region of InN

AU - Chang, Y. M.

AU - Chuang, C. T.

AU - Chia, C. T.

AU - Tsen, K. T.

AU - Lu, H.

AU - Schaff, W. J.

N1 - Funding Information: One of the authors (Y.-M.C.) acknowledges the financial support of the National Science Council and Academia Sinica of Taiwan. The work at ASU is supported by the National Science Foundation under Grant No. DMR-0305147. The work at Cornell University is supported by ONR Contract No. N000149910936 monitored by Dr. Colin Wood and a LBNL Subcontract No. 6703635. They also wish to acknowledge the technical assistance of Mark Little and Troy Richardson.

PY - 2004/11/29

Y1 - 2004/11/29

N2 - Coherent phonon spectroscopy of a high-quality InN epitaxial layer is carried out using time-resolved second-harmonic generation. A coherent longitudinal optical phonon and plasmon coupling mode only at 447 cm -1 can be resolved in the spectrum. Its frequency shows no dependence on the photoinjected carrier density up to 1.5 × 10 19 cm -3. This phenomenon is attributed to the hybridization of a coherent A 1(LO) phonon with the intrinsic cold plasma accumulated in the near-surface region of InN, where the plasma density could reach on the order of 10 20 cm -3, much higher than the bulk carrier concentration 1 × 10 18 cm -3 determined by Hall effect measurement.

AB - Coherent phonon spectroscopy of a high-quality InN epitaxial layer is carried out using time-resolved second-harmonic generation. A coherent longitudinal optical phonon and plasmon coupling mode only at 447 cm -1 can be resolved in the spectrum. Its frequency shows no dependence on the photoinjected carrier density up to 1.5 × 10 19 cm -3. This phenomenon is attributed to the hybridization of a coherent A 1(LO) phonon with the intrinsic cold plasma accumulated in the near-surface region of InN, where the plasma density could reach on the order of 10 20 cm -3, much higher than the bulk carrier concentration 1 × 10 18 cm -3 determined by Hall effect measurement.

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Coherent longitudinal optical phonon and plasmon coupling in the near-surface region of InN

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