ISSN:
1432-0630
Keywords:
78.20 Jq
;
78.65 Gb
;
42.70 Fh
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract Recently, an anomalously large redshift of the absorption edge with electric field was claimed for β-GaSe1−x S x layered crystals. We have studied Bridgman grown ε-GaSe crystals as well as vapor transport grown β-GaS, and 2H-WSe2. While we have observed a shift in the absorption edge for ε-GaSe similar to that reported in previous work, our results demonstrate that the redshift arises from Joule heating, and is thus temperature induced, rather than intrinsic. For β-GaS, much larger resistivities virtually eliminate Joule heating, and our measurements of the electric field induced absorption edge shift yield an estimated upper limit of approximately 0.04 meV · cm/kV for a field of 2.4×103 kV/cm, in good agreement with the theoretical value expected for the Franz-Keldysh effect.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00348135
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