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1 Mar 2004

Volume 84, Issue 9, pp. 1435-1613

Issue Cover Spotlight Figure

Appl. Phys. Lett. 84, 1558 (2004); http://dx.doi.org/10.1063/1.1651641 (3 pages)

DongWeon Lee, Adrian Wetzel, Roland Bennewitz, Ernst Meyer, Michel Despont, Peter Vettiger, and Christoph Gerber
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Turnaround of hysterisis for capacitance–voltage characteristics of hafnium oxynitride dielectrics

J. C. Wang, D. C. Shie, T. F. Lei, and C. L. Lee

Appl. Phys. Lett. 84, 1531 (2004); http://dx.doi.org/10.1063/1.1644616 (3 pages) | Cited 3 times

Online Publication Date: 25 February 2004

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The capacitance–voltage (C–V) characteristics of hafnium oxynitride gate dielectrics for silicon metal-oxide-semiconductor (MOS) capacitors with different sweep voltage were investigated. It was found that, for the p-type substrate MOS capacitor, the C–V hysterisis has a turnaround characteristic as the applied voltage exceeds −3.0 V. The phenomenon is explained by electron trappings at the low electric field and hole trappings, which resulted from the impact ionization, at the high electric field in the dielectrics. © 2004 American Institute of Physics.
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77.55.-g Dielectric thin films
84.32.Tt Capacitors
73.40.Qv Metal-insulator-semiconductor structures (including semiconductor-to-insulator)
72.20.Jv Charge carriers: generation, recombination, lifetime, and trapping
72.20.Ht High-field and nonlinear effects
77.84.Bw Elements, oxides, nitrides, borides, carbides, chalcogenides, etc.

Slow relaxation of field-induced piezoelectric resonance in paraelectric barium stannate titanate

Xiaoyong Wei, Yujun Feng, and Xi Yao

Appl. Phys. Lett. 84, 1534 (2004); http://dx.doi.org/10.1063/1.1655694 (3 pages) | Cited 16 times

Online Publication Date: 25 February 2004

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A kind of slow relaxation of field-induced piezoelectric resonance is observed in paraelectric barium stannate titanate ceramics. The piezoelectric resonance peaks vanish in several minutes when bias field is either applied or removed. These phenomena may be universal for dielectrics and can be explained by a model of slow dipoles composed of injected homocharges. With this model, the authors predict a negative piezoelectric modulus of d33 when just the bias field is removed, and verify it by experimental results. © 2004 American Institute of Physics.
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77.22.Gm Dielectric loss and relaxation
77.80.B- Phase transitions and Curie point
77.65.Fs Electromechanical resonance; quartz resonators
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates

Experimental confirmation of negative refractive index of a metamaterial composed of Ω-like metallic patterns

Jiangtao Huangfu, Lixin Ran, Hongsheng Chen, Xian-min Zhang, Kangsheng Chen, Tomasz M. Grzegorczyk, and Jin Au Kong

Appl. Phys. Lett. 84, 1537 (2004); http://dx.doi.org/10.1063/1.1655673 (3 pages) | Cited 95 times

Online Publication Date: 25 February 2004

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A one-dimensional metamaterial is realized using three connected Ω rings printed back-to-back and reversed on two sides of a dielectric substrate. Both transmission and prism experiments are reported, yielding concordant results of the presence of a left-handed frequency band. Experiments show reduced losses and an enlarged left-handed frequency band. © 2004 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)
42.70.Gi Light-sensitive materials
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