Nonlinear acoustoelectric transport in a two-dimensional electron system

Govorov, A. O.; Kalameitsev, A. V.; Rotter, M.; Wixforth, Achim; Kotthaus, J. P.; Hoffmann, Karl-Heinz; Botkin, Nikolai D.

doi:10.1103/physrevb.62.2659

Cited by 24 publications

(22 citation statements)

References 25 publications

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“…The systematic off-set between the theory and experiments can be explained by the change of the SAW velocity: The electrodes of the IDT decreased the velocity from 3978 m/s to 3870 m/s as piezoelectric shorting has to be included 41 . But this effect was reduced by the presence of an additional dielectric medium on the substrate, resulting in a higher SAW velocity than the theoretical one in the case of isopropanol covered SAW-chip 42 43 44 45 46 .…”

Section: Resultsmentioning

confidence: 78%

Visualization of Surface Acoustic Waves in Thin Liquid Films

Rambach

Taiber

Scheck

et al. 2016

Sci Rep

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We demonstrate that the propagation path of a surface acoustic wave (SAW), excited with an interdigitated transducer (IDT), can be visualized using a thin liquid film dispensed onto a lithium niobate (LiNbO3) substrate. The practical advantages of this visualization method are its rapid and simple implementation, with many potential applications including in characterising acoustic pumping within microfluidic channels. It also enables low-cost characterisation of IDT designs thereby allowing the determination of anisotropy and orientation of the piezoelectric substrate without the requirement for sophisticated and expensive equipment. Here, we show that the optical visibility of the sound path critically depends on the physical properties of the liquid film and identify heptane and methanol as most contrast rich solvents for visualization of SAW. We also provide a detailed theoretical description of this effect.

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Section: Resultsmentioning

confidence: 78%

Visualization of Surface Acoustic Waves in Thin Liquid Films

Rambach

Taiber

Scheck

et al. 2016

Sci Rep

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“…There has also been a wealth of research on the saW aE effect on metals, oxides, and overlay layers-most notably on acoustic charge transport [14], [15], superconductivity [16], and quantum hall effects [17]. The work on acoustic charge transport may be useful in understanding the aE interaction with ultra-thin films on a sub-micron level.…”

Section: Early Experimental Workmentioning

confidence: 98%

Study of the acoustoelectric effect for SAW sensors

Fisher

Malocha

2010

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Research has recently begun on the use of ultrathin films and nanoclusters as mechanisms for sensing of gases, liquids, etc., because the basic material parameters may change because of film morphology. As films of various materials are applied to the surface of SAW devices for sensors, the conductivity of the films may have a strong acoustoelectric effect, whether desired or not. The purpose of this paper is to reexamine the theory and predictions of the acoustoelectric effect for SAW interactions with thin conducting or semi-conducting films. The paper will summarize the theory and predict the effects of thin film conductivity on SAW velocity and propagation loss versus frequency and substrate material. The theory predicts regions of conductivity which result in extremely high propagation loss, and which also correspond to the mid-point between the open and short-circuit velocities. As an example of the verification and possible usefulness of the acoustoelectric effect, recent experimental results of palladium (Pd) thin films on a YZ LiNbO3 SAW delay line have shown large changes in propagation loss, depending on the Pd film thickness, exposure to hydrogen gas, or both. By proper design, a sensitive hydrogen leak detector SAW sensor can be designed.

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“…A number of reviews on the subject have been published [14][15][16][17]. More recent work has been reported by Gurevich et al [18], Mensah et al [19], and for a two-dimensional system by Govorov et al [20].…”

Section: Introductionmentioning

confidence: 96%

Amplification of Ultrasonic Waves in Bulk GaN and GaAlN/GaN Heterostructures

Abdelraheem

Blyth

Balkan

2001

phys. stat. sol. (a)

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We report the results of calculations of ultrasonic amplification in bulk and 2D GaN, as a function of both ultrasound frequency and electron drift velocity. It is shown that GaN is in principle, a suitable material for the observation of acoustoelectric gain at applied fields corresponding to electron drift velocities, which are slightly higher than the sound velocity. As a result, acoustoelectric instabilities should prevail before the onset of other nonlinear effects associated with hot electron transport. However, because of the poor quality of current GaN material grown on sapphire, lattice attenuation is expected to be high and counteract the amplification in poor quality GaN, whereas a net amplification should be achieved in non-degenerate 2D GaN.

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Nonlinear acoustoelectric transport in a two-dimensional electron system

Cited by 24 publications

References 25 publications

Visualization of Surface Acoustic Waves in Thin Liquid Films

Visualization of Surface Acoustic Waves in Thin Liquid Films

Study of the acoustoelectric effect for SAW sensors

Amplification of Ultrasonic Waves in Bulk GaN and GaAlN/GaN Heterostructures

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