Ultrafast upper satellite valley spectroscopic dynamics using UV-pump IR-probe absorption spectroscopy in GaAs and GaP

Michael A. Cavicchia; Robert R. Alfano

doi:10.1117/12.175884

6 May 1994 Ultrafast upper satellite valley spectroscopic dynamics using UV-pump IR-probe absorption spectroscopy in GaAs and GaP

Michael A. Cavicchia, Robert R. Alfano

Author Affiliations +

Proceedings Volume 2142, Ultrafast Phenomena in Semiconductors; (1994) https://doi.org/10.1117/12.175884
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

Energy relaxation of electrons in the X₆ and X₇, satellite, X₆ (reversible reaction) (Gamma) and X₇ (reversible reaction) (Gamma) , have been investigated using time-resolved UV pump-IR probe absorption spectroscopy in GaAs and GaP. Energy band renormalization of the X₆ and X₇ valleys, band filling effects in the X₆ yields X₇ spectra, and O.D. spectral relaxation of electrons in the X₆ and X₇ valleys by intervalley scattering, X₆ (reversible reaction) (Gamma) and X₇ (reversible reaction) (Gamma) , were all observed as a function of photoexcited electron density. From the observed energy relaxation dynamics it is determined that X₇ yields (Gamma) intervalley scattering is faster than X₆ yields (Gamma) intervalley scattering in GaAs. These experiments were performed by measuring the absorption spectra of 500-fs IR probe pulses induced by 500-fs UV pump pulses, as a function of delay time and pump pulse fluence. The spectra, at different pump pulse fluences and pump-probe delay times, are interpreted in terms of free carrier absorption, X₆ yields X₇ direct interconduction band absorption, and indirect interconduction band absorption.

Citation Download Citation

Michael A. Cavicchia and Robert R. Alfano "Ultrafast upper satellite valley spectroscopic dynamics using UV-pump IR-probe absorption spectroscopy in GaAs and GaP", Proc. SPIE 2142, Ultrafast Phenomena in Semiconductors, (6 May 1994); https://doi.org/10.1117/12.175884

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available