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1 Sep 1999

Volume 86, Issue 5, pp. 2373-2926

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The Burstein-Moss effect in Cu2GeSe3:Co2+ single crystals

Jeoung Ju Lee, Chang Soo Yang, Young Sin Park, Kun Ho Kim, and Wha Tek Kim

J. Appl. Phys. 86, 2914 (1999); http://dx.doi.org/10.1063/1.371141 (3 pages) | Cited 7 times

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Cu2GeSe3 and Cu2GeSe3:Co2+ single crystals are grown using the modified Bridgman method. The grown single crystals have orthorhombic structures. The energy band gaps for Cu2GeSe3 and Cu2GeSe3:Co2+ single crystals measured at 298 K were about 0.789 and 0.798 eV, respectively, and these gaps are due to direct transitions. The Burstein-Moss effect due to overlapping of the energy level of Co2+(Td) and the conduction band of the Cu2GeSe3:Co2+ is observed. © 1999 American Institute of Physics.
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78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
81.05.Hd Other semiconductors
81.10.Fq Growth from melts; zone melting and refining
61.66.Fn Inorganic compounds
71.20.Nr Semiconductor compounds
71.55.Ht Other nonmetals

Interaction between surface acoustic waves and resonant tunneling structures in GaAs

V. I. Talyanskii, A. B. Hutchinson, I. E. Batov, D. A. Ritchie, and E. H. Linfield

J. Appl. Phys. 86, 2917 (1999); http://dx.doi.org/10.1063/1.371142 (3 pages) | Cited 2 times

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We report the observation of interaction between a 1 GHz surface acoustic wave and vertical electron beams in a specially designed GaAs resonant tunneling structure. The interaction relies on the vertical component of the surface acoustic wave’s electric field to trigger a current through the structure. A theoretical analysis is presented that reveals the importance of both the spatial distribution of the surface acoustic wave potential and the nonlocality of the structure’s conductivity on the operation of the device. Possible applications of this interaction for signal processing and powerful microwave devices are discussed. © 1999 American Institute of Physics.
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73.61.Ey III-V semiconductors
68.35.Gy Mechanical properties; surface strains
73.23.-b Electronic transport in mesoscopic systems
73.50.Rb Acoustoelectric and magnetoacoustic effects

Determination of contact angles: Consistency between experiment and theory

A. El Ghzaoui

J. Appl. Phys. 86, 2920 (1999); http://dx.doi.org/10.1063/1.371143 (3 pages) | Cited 4 times

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The Lifshitz–van der Waals theory has been used to calculate the contact angles of dispersive liquids and solids: diiodomethane, α-bromonaphtalene, methylnaphtalene, benzene, and n-octane, liquids on polytetrafluoroethylene, polystyrene, polyisobutene, polyvinylchloride, and polyethylene. The theoretical calculation of the contact angles was based on the nonretarded Hamaker constants which have been calculated from the dielectric properties of the materials and application of the Lifshitz theory. These theoretical contact angles were compared with the experimental contact angles measured by the Wilhelmy plate method. Closely related values have been found for the theoretical and experimental contact angles. © 1999 American Institute of Physics.
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68.03.Cd Surface tension and related phenomena
61.20.-p Structure of liquids

Magnetic field enhancement of water vaporization

Jun Nakagawa, Noriyuki Hirota, Koichi Kitazawa, and Makoto Shoda

J. Appl. Phys. 86, 2923 (1999); http://dx.doi.org/10.1063/1.371144 (3 pages) | Cited 27 times

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The water vaporization rate, an essential process for all the biological processes, was found to be significantly influenced under static magnetic fields up to 8 T in air and oxygen. The magnitude of the effect depended on the field–field gradient product B⋅dB/dx rather than on B itself. Under forced flow conditions of the atmosphere, both enhancement and suppression of the vaporization rate were observed depending upon the direction of the gas flow relative to the field gradient. A mechanism is proposed to explain the results in a systematic manner based on the assumption of the creation of magnetic wind driven by the gradient susceptibility distribution caused by water content distribution in the atmosphere. It is discussed that this magneto enhancement of vaporization may be the indirect cause of frequently reported field effects on living organisms. © 1999 American Institute of Physics.
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64.70.F- Liquid-vapor transitions
87.50.C- Static and low-frequency electric and magnetic fields effects
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