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, and James S. Speck
Phys. Rev. B 94, 235205 – Published 19 December 2016

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.

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  • Received 9 August 2016
  • Revised 17 October 2016

DOI:https://doi.org/10.1103/PhysRevB.94.235205

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Saulius Marcinkevičius1,*, Tomas K. Uždavinys1, Humberto M. Foronda2, Daniel A. Cohen2, Claude Weisbuch2,3, and James S. Speck2

  • 1KTH Royal Institute of Technology, Department of Materials and Nano Physics, Electrum 229, 16440 Kista, Sweden
  • 2Materials Department, University of California, Santa Barbara, California 93106, USA
  • 3Laboratoire de la Physique de la Matière Condensée, CNRS, Ecole Polytechnique, Palaiseau, France

  • *sm@kth.se

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Issue

Vol. 94, Iss. 23 — 15 December 2016

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