Amplification of coherent polar vibrations in biopolymers: Fröhlich condensate

Mesquita, Marcus V.; Vasconcellos, Áurea R.; Luzzi, Roberto

doi:10.1103/physreve.48.4049

Cited by 34 publications

(75 citation statements)

References 32 publications

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“…It can be shown that 13) and the (acoustic) magnon dispersion relation is given by 14) and Refs. [4,67] presents recent studies on this dispersion relation in cases of thin films of YIG.…”

Section: Appendix a The Hamiltonian Of The Magnon Systemmentioning

confidence: 99%

“…A first case was evidenced by Herbert Fröhlich who considered the many boson system consisting of polar vibration (lo phonons) in biopolymers under dark excitation (metabolic energy pumping) and embedded in a surrounding fluid [11,12,13,14]. From a Science, Technology and Innovation (STI) point of view it was considered to have implications in medical diagnosis [15].…”

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confidence: 99%

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Dynamics of a Bose-Einstein condensate of excited magnons

2013

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Abstract. The emergence of a non-equilibrium Bose-Einstein-like condensation of magnons in rf-pumped magnetic thin films has recently been experimentally observed. We present here a complete theoretical description of the non-equilibrium processes involved. It it demonstrated that the phenomenon is another example of the presence of a Bose-Einstein-like condensation in nonequilibrium many-boson systems embedded in a thermal bath, better referred-to as Fröhlich-Bose-Einstein condensation. The complex behavior emerges after a threshold of the exciting intensity is attained. It is inhibited at higher intensities when the magnon-magnon interaction drives the magnons to internal thermalization. The observed behavior of the relaxation to equilibrium after the end of the pumping pulse is also accounted for and the different processes fully described.

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“…It can be shown that 13) and the (acoustic) magnon dispersion relation is given by 14) and Refs. [4,67] presents recent studies on this dispersion relation in cases of thin films of YIG.…”

Section: Appendix a The Hamiltonian Of The Magnon Systemmentioning

confidence: 99%

mentioning

confidence: 99%

Dynamics of a Bose-Einstein condensate of excited magnons

2013

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“…• "Bose-Einstein-like condensation" of LO phonons (Fröhlich effect) in biopolymers, generated by dark excitation, which is accompanied by the emission of solitons of the Schroedinger-Davydov type, possessing a very long half life [158] (of interest in Physiology and Neurology).…”

Section: Coherent States and Nonequilibrium Bose-einstein-like Conmentioning

confidence: 99%

The role of nonequilibrium thermo-mechanical statistics in modern technologies and industrial processes: an overview

Rodrigues¹,

Silva²,

Silva³

et al. 2010

Braz. J. Phys.

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The nowadays notable development of all the modern technology, fundamental for the progress and well being of world society, imposes a great deal of stress in the realm of basic Physics, more precisely on ThermoStatistics. We do face situations in electronics and optoelectronics involving physical-chemical systems farremoved-from equilibrium, where ultrafast (in pico-and femto-second scale) and non-linear processes are present. Further, we need to be aware of the rapid unfolding of nano-technologies and use of low-dimensional systems (e.g., nanometric quantum wells and quantum dots in semiconductor heterostructures). All together this demands having an access to a Statistical Mechanics being efficient to deal with such requirements. It is worth noticing that the renowned Ryogo Kubo once stated that "statistical mechanics has been considered a theoretical endeavor. However, statistical mechanics exists for the sake of the real world, not for fictions. Further progress can only be hoped by close cooperation with experiment". Moreover, one needs to face the study of soft matter and fluids with complex structures (usually of the average self-affine fractal-like type). This is relevant for technological improvement in industries like, for example, that of polymers, petroleum, cosmetics, food, electronics and photonics (conducting polymers and glasses), in medical engineering, etc. It is then required to introduce a thermo-hydrodynamics going well beyond the classical (Onsagerian) one. Moreover, in the both type of situations above mentioned there often appear difficulties of description and objectivity (existence of so-called "hidden constraints"), which impair the proper application of the conventional ensemble approach used in the general, logically and physically sound, and well established Boltzmann-Gibbs statistics. A tentative to partially overcome such difficulties consists in resorting to non-conventional approaches. Here we briefly describe the construction of a Non-Equilibrium Statistical Ensemble Formalism (NESEF) that can deal, within a certain degree of success, with the situations above described. Several particular instances involving experimental observations and measurements in the area of semiconductor physics and in physics of fluids, which were analyzed in the context of the theory, are summarized. They comprise the cases of ultrafast optical spectroscopy; optical and transport processes in low-dimensional complex semiconductors; nonlinear transport in doped highly-polar semiconductors (of use in "blue diodes") under moderate to high electric fields; nonlinear higher-order thermo-hydrodynamics in fluids under driven flow, in normal solutions and in complex situations as in solutions of polymers, micelles, DNA, and in microbatteries.

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“…Moreover, a c < a n (in general much smaller) since the privileged modes to be largely excited are the minority ones at the lowest frequencies (see for example [39]). We solve the stationary equations of evolution, to obtain the expression for the populations given in Appendix C. Numerical solutions are derived introducing values for the dierent parameters that appear in the basic Eqs.…”

Section: Numerical Solutions For a Model Systemmentioning

confidence: 99%

“…Another case is that of dipolar vibrations in biopolymers and other biological materials, excited by metabolic processes, and in contact with a thermal bath as those in [28±31]. Exact model calculations [39] seem to show that biopolymers are quite appropriate candidates for the actual occurrence of the Fr ohlich eect, and the case of the molecular polymer acetanilide has been considered in [43]. Moreover, the kind of nonlinearities we are considering here seems to lead to particular complex behavior (Fr ohlich eect, Davidov soliton, Cherenkov-like radiation) in the propagation of ultrasound waves in biomaterials [44,45].…”

Section: Summary and Concluding Remarksmentioning

confidence: 99%