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Terahertz studies of the dielectric response and second-order phonons in a GaSe crystal

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5 Author(s)
Yu, B.L. ; Institute for Ultrafast Spectroscopy and Lasers and New York State Center for Advanced Technology for Ultrafast Photonics Materials and Applications, Physics Department, The City College of the City University of New York, New York, New York 10031 ; Zeng, F. ; Kartazayev, V. ; Alfano, R.R.
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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=2.6±0.2 THz, the average momentum relaxation time <τ>=56±2 fs, and the mobility μ=89 cm2/V s for electrons. The THz absorption spectrum showed resonance structures attributed to the difference frequency combinations associated with acoustical and optical phonons.

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Applied Physics Letters  (Volume:87 ,  Issue: 18 )