An ultrasound emitter based on assisted tunneling
نویسندگان
چکیده
The problem of electron tunneling assisted by an elementary excitation in a double barrier resonant device is usually described within a sequential (decoherent) approximation. By solving exactly the many-body problem for a simplified model of electron–phonon interaction we show, analytically and numerically, that the assisted tunneling peak can be strongly enhanced by an appropriate election of the geometrical parameters of the device. This induces a symmetry condition in the Fock space that maximizes the effectiveness of the scattering process. We propose that this process could provide the primary longitudinal optical phonons required to operate a phonon laser (SASER). q 2002 Elsevier Science Ltd. All rights reserved. PACS: 73.63.Hs; 73.63.2b; 73.40.Gk; 71.38.2k
منابع مشابه
Synthesis and Characterization of Colloidal Nanosilica via an Ultrasound Assisted Route Based on Alkali Leaching of Silica Fume
Colloidal nanosilica is currently being produced by various methods which are mainly high energy intensive and/or not environmentally friendly. It is therefore essential to develop new energy-efficient and environmentally friendly technologies. This paper introduces a new ultrasound assisted route based on alkali leaching of silica fume for synthesis of colloidal silica nanoparticles. The ef...
متن کاملResonant-tunneling diodes with emitter prewells
Related Articles Ultra-thin titanium oxide Appl. Phys. Lett. 101, 083113 (2012) Influence of doping on the electronic transport in GaSb/InAs(Sb) nanowire tunnel devices Appl. Phys. Lett. 101, 043508 (2012) Simulation of trap-assisted tunneling effect on characteristics of gallium nitride diodes J. Appl. Phys. 111, 123115 (2012) Tuning of terahertz intrinsic oscillations in asymmetric triple-bar...
متن کاملA Method Based on Ultrasound-assisted Solidification of Floating Drop Microextraction Technique for the Spectrophotometric Determination of Curcumin in Turmeric Powder
A method based on the ultrasound-assisted solidification of floating drop microextraction technique was developed for the spectrophotometric and spectrofluorimetric determination of curcumin in turmeric powder. In this work a small volume of an organic solvent was floated on the surface of an aqueous solution. After sonication the organic solvent is solidified and separated. The effect of extra...
متن کاملCoherent and sequential photoassisted tunneling through a semiconductor double-barrier structure.
We have studied the problem of coherent and sequential tunneling through a double barrier structure, assisted by light considered to be present All over the structure, i,e emitter, well and collector as in the experimental evidence. By means of a canonical transformation and in the framework of the time dependent perturbation theory, we have calculated the transmission coefficient and the elect...
متن کاملAnalysis of a photon assisted field emission device
A field emitter array held at the threshold of emission by a dc gate potential from which current pulses are triggered by the application of a laser pulse on the backside of the semiconductor may produce electron bunches ~‘‘density modulation’’! at gigahertz frequencies. We develop an analytical model of such optically controlled emission from a silicon tip using a modified Wentzel– Kramers–Bri...
متن کامل