Results 221 to 230 of about 1,457 (252)

Pseudospin quantum acoustics in liquids

Ultrasonics, 1980
Abstract We call attention to the fact that data on spin-lattice relaxation in liqudis can give information about the rate of resonant acoustic transitions in substances where ordinary electron paramagnetic resonance (epr) and nuclear magnetic resonance (nmr) have been studied.
A.V. Alekseev, U.Kh. Kopvillem
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Quantum positron acoustic waves

Physics of Plasmas, 2014
Nonlinear quantum positron-acoustic (QPA) waves are investigated for the first time, within the theoretical framework of the quantum hydrodynamic model. In the small but finite amplitude limit, both deformed Korteweg-de Vries and generalized Korteweg-de Vries equations governing, respectively, the dynamics of QPA solitary waves and double-layers are ...
Hassina Metref, Mouloud Tribeche
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Physical acoustics in quantum fluids

The Journal of the Acoustical Society of America, 1975
Superfluid helium is rich in the number of wave propagation modes which occur because it behaves as though it is composed of two fluids one of which is superfluid and the other a normal fluid. Four recognized modes are named first, second, third and fourth sound, of which all but the first occur only in quantum fluids.
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Quantum Acoustical Imaging

2004
So far all forms of acoustical imaging are diffraction limited and so their resolution limit obeys Rayleigh’s criterion, that is λ/2, where λ is the sound wavelength. In this paper, we apply quantum theory to acoustical imaging and obtain the resolution limit given by the effective de Broglie wavelength λ/N where N is the number of entangled phonons ...
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Acoustic-phonon scattering in a rectangular quantum wire

Physical Review B, 1993
The rates of electron scattering by acoustic phonons in a rectangular quantum wire embedded into another material are calculated in the framework of the Fermi golden rule. Both intrasubband and intersubband electron scattering by acoustic phonons are considered. It has been shown that due to uncertainty of momentum conservation in quasi-one-dimensional
, Mickevicius, , Mitin
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Acoustical phonon dephasing in GaAs quantum dots

Microelectronics Journal, 2005
Abstract We present results on the acoustical phonon dephasing for a single GaAs quantum dot. Micro photoluminescence ( μ -PL) is used to observe the temperature dependence of the exciton line in self-assembled GaAs semiconductor single quantum dots (QDs). The observation of the PL with temperature shows that there are two different states within the
K. Ikeda, F. Minami, N. Koguchi
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Acoustic Analogies for Quantum Mechanics

2004
In Chap. 2, we considered the analogy between the propagation of electromagnetic waves and quantum waves, based on the formal similarity between the Helmholtz and the Schrodinger equation. However, a similar analogy holds for sound waves. This is to be expected since sound waves are not so different from electromagnetic waves.
Daniela Dragoman, Mircea Dragoman
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Quantum Pseudospin Acoustics in Liquids

1979
The realization of Zavoiski’s ideas concerning acoustic EPR and NMR in fluids are discussed. A general relation between heat fluctuations and sound perturbations is found. Formulas for dipole-dipole and hyperfine AEPR and ANMR are derived. Experimental results for sound modulation of proton spin echoes in aqueous solutions of CuSO4·5H2O are presented.
A. V. Alekseev, U. Kh. Kopvillem
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Pumping of Quantum Dots with Surface Acoustic Waves

physica status solidi (b), 2001
Surface acoustic waves on a semiconductor quantum well structure are accompanied by strong lateral piezo-electric fields. Those fields can ionize photo-generated excitons and trap the fragments, electron-hole pairs, in the moving lateral potential wells to the wave.
Bödefeld, C., Wixforth, Achim, Toivonen, J., Sopanen, M., Lipsanen, H.   +4 more
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Biomedical Acoustics: Making a quantum leap in medicine

The Journal of the Acoustical Society of America, 2011
At the dawn of a new era in medicine, the future of biomedical acoustics is bright. In the last century, we witnessed the introduction of ultrasound contrast agents, lithotripsy, and the visualization of ultrasound images in three dimensions. Currently, scientists are developing acoustic-based techniques for opening the blood–brain barrier transiently ...
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