Intervalley energy of GaN conduction band measured by femtosecond pump-probe spectroscopy

Saulius Marcinkevičius; Tomas K. UŽdavinys; Humberto M. Foronda; Daniel A. Cohen; Claude Weisbuch; James S. Speck

doi:10.1103/PhysRevB.94.235205

Intervalley energy of GaN conduction band measured by femtosecond pump-probe spectroscopy

Saulius Marcinkevičius, Tomas K. UŽdavinys, Humberto M. Foronda, Daniel A. Cohen, Claude Weisbuch, James S. Speck

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

20 Scopus citations

Abstract

Time-resolved transmission and reflection measurements were performed for bulk GaN at room temperature to evaluate the energy of the first conduction band satellite valley. The measurements showed clear threshold-like spectra for transmission decay and reflection rise times. The thresholds were associated with the onset of the intervalley electron scattering. Transmission measurements with pump and probe pulses in the near infrared produced an intervalley energy of 0.97±0.02 eV. Ultraviolet pump and infrared probe reflection provided a similar value. Comparison of the threshold energies obtained in these experiments allowed estimating the hole effective mass in the upper valence band to be 1.4m0. Modeling of the reflection transients with rate equations has allowed estimating electron-LO (longitudinal optical) phonon scattering rates and the satellite valley effective mass.

Original language	English (US)
Journal	Physical Review B
Volume	94
Issue number	23
DOIs	https://doi.org/10.1103/PhysRevB.94.235205
State	Published - Dec 19 2016
Externally published	Yes

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10.1103/PhysRevB.94.235205

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@article{cddb4befe6ec4ce69e72b6fbea80a2b7,

title = "Intervalley energy of GaN conduction band measured by femtosecond pump-probe spectroscopy",

abstract = "Time-resolved transmission and reflection measurements were performed for bulk GaN at room temperature to evaluate the energy of the first conduction band satellite valley. The measurements showed clear threshold-like spectra for transmission decay and reflection rise times. The thresholds were associated with the onset of the intervalley electron scattering. Transmission measurements with pump and probe pulses in the near infrared produced an intervalley energy of 0.97±0.02 eV. Ultraviolet pump and infrared probe reflection provided a similar value. Comparison of the threshold energies obtained in these experiments allowed estimating the hole effective mass in the upper valence band to be 1.4m0. Modeling of the reflection transients with rate equations has allowed estimating electron-LO (longitudinal optical) phonon scattering rates and the satellite valley effective mass.",

author = "Saulius Marcinkevi{\v c}ius and U{\v Z}davinys, {Tomas K.} and Foronda, {Humberto M.} and Cohen, {Daniel A.} and Claude Weisbuch and Speck, {James S.}",

note = "KAUST Repository Item: Exported on 2022-06-08 Acknowledgements: Research at KTH was performed within the framework of the Linnaeus Excellence Center for Advanced Optics and Photonics (ADOPT), and was financially supported by the Swedish Research Council (Contract No. 621-2013-4096). Research at UCSB was supported in part by the U.S. Department of Energy (program DE-EE0007096) and by the KACST-KAUST-UCSB Solid State Lighting Program This publication acknowledges KAUST support, but has no KAUST affiliated authors.",

year = "2016",

month = dec,

day = "19",

doi = "10.1103/PhysRevB.94.235205",

language = "English (US)",

volume = "94",

journal = "Physical Review B",

issn = "2469-9969",

publisher = "American Institute of Physics",

number = "23",

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TY - JOUR

T1 - Intervalley energy of GaN conduction band measured by femtosecond pump-probe spectroscopy

AU - Marcinkevičius, Saulius

AU - UŽdavinys, Tomas K.

AU - Foronda, Humberto M.

AU - Cohen, Daniel A.

AU - Weisbuch, Claude

AU - Speck, James S.

N1 - KAUST Repository Item: Exported on 2022-06-08 Acknowledgements: Research at KTH was performed within the framework of the Linnaeus Excellence Center for Advanced Optics and Photonics (ADOPT), and was financially supported by the Swedish Research Council (Contract No. 621-2013-4096). Research at UCSB was supported in part by the U.S. Department of Energy (program DE-EE0007096) and by the KACST-KAUST-UCSB Solid State Lighting Program This publication acknowledges KAUST support, but has no KAUST affiliated authors.

PY - 2016/12/19

Y1 - 2016/12/19

N2 - Time-resolved transmission and reflection measurements were performed for bulk GaN at room temperature to evaluate the energy of the first conduction band satellite valley. The measurements showed clear threshold-like spectra for transmission decay and reflection rise times. The thresholds were associated with the onset of the intervalley electron scattering. Transmission measurements with pump and probe pulses in the near infrared produced an intervalley energy of 0.97±0.02 eV. Ultraviolet pump and infrared probe reflection provided a similar value. Comparison of the threshold energies obtained in these experiments allowed estimating the hole effective mass in the upper valence band to be 1.4m0. Modeling of the reflection transients with rate equations has allowed estimating electron-LO (longitudinal optical) phonon scattering rates and the satellite valley effective mass.

AB - Time-resolved transmission and reflection measurements were performed for bulk GaN at room temperature to evaluate the energy of the first conduction band satellite valley. The measurements showed clear threshold-like spectra for transmission decay and reflection rise times. The thresholds were associated with the onset of the intervalley electron scattering. Transmission measurements with pump and probe pulses in the near infrared produced an intervalley energy of 0.97±0.02 eV. Ultraviolet pump and infrared probe reflection provided a similar value. Comparison of the threshold energies obtained in these experiments allowed estimating the hole effective mass in the upper valence band to be 1.4m0. Modeling of the reflection transients with rate equations has allowed estimating electron-LO (longitudinal optical) phonon scattering rates and the satellite valley effective mass.

UR - http://hdl.handle.net/10754/678728

UR - https://link.aps.org/doi/10.1103/PhysRevB.94.235205

UR - http://www.scopus.com/inward/record.url?scp=85007564015&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.94.235205

DO - 10.1103/PhysRevB.94.235205

M3 - Article

SN - 2469-9969

VL - 94

JO - Physical Review B

JF - Physical Review B

IS - 23

ER -

Intervalley energy of GaN conduction band measured by femtosecond pump-probe spectroscopy

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