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Terahertz Resonances in the Dielectric Response Due to Second Order Phonons in a GaSe Crystal

Published online by Cambridge University Press:  01 February 2011

Baolong L. Yu ,
Hakan Altan ,
Fanang Zeng ,
Vladimir Kartazayev ,
Robert Alfano  and
Krishna C. Mandal
Baolong L. Yu
Affiliation:
blyu@sci.ccny.cuny.edu, City College of New York, IUSL-Physics, Marshak Bldg, Rm J201, 160 Convent Avenue,, New York, NY, 10031, United States
Hakan Altan
Affiliation:
haltan@sci.ccny.cuny.edu, City College of New York, IUSL-Physics, Marshak Bldg, Rm J201, 160 Convent Avenue, New York, NY, 10031, United States
Fanang Zeng
Affiliation:
fzeng@sci.ccny.cuny.edu, City College of New York, IUSL-Physics, Marshak Bldg, Rm J201, 160 Convent Avenue, New York, NY, 10031, United States
Vladimir Kartazayev
Affiliation:
vkartazayev@sci.ccny.cuny.edu, City College of New York, IUSL-Physics, Marshak Bldg, Rm J201, 160 Convent Avenue, New York, NY, 10031, United States
Robert Alfano
Affiliation:
ralfano@ccny.cuny.edu, City College of New York, IUSL-Physics, Marshak Bldg, Rm J201, 160 Convent Avenue, New York, NY, 10031, United States
Krishna C. Mandal
Affiliation:
drauh@eiclabs.com, EIC Laboratories INC., 111 Downey Street, Norwood, MA, 02062, United States
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Abstract

The dielectric function and momentum relaxation time of carriers for a single-crystal GaSe were investigated using terahertz time-domain spectroscopy over the frequency range from 0.4 to 2.4 THz. The key parameters determined from THz data using the Drude model are: the plasma frequency ωp = 6.1 ± 0.5 THz, the average momentum relaxation time <τ> = 51 +± 6 fs for electrons. The THz absorption spectrum showed resonance structures attributed to the difference frequency combinations associated with acoustical and optical phonons. This paper has already been published, see B. L. Yu, F. Zeng, V. Kartazayev, and R. R. Alfano, “Terahertz studies of the dielectric response of and second order phonons in a GaSe crystal,” Appl. Phys. Lett. 86, 182104 (2005).

Keywords

layeredoptical propertieselectrical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 935: Symposium K – Materials Research for THz Applications , 2006 , 0935-K03-08
Copyright
Copyright © Materials Research Society 2006

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