Quantum Fluctuations in the Fröhlich Condensate of Molecular Vibrations Driven Far From Equilibrium
| Autor: | Girish S. Agarwal, Marlan O. Scully, Zhedong Zhang |
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| Rok vydání: | 2019 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics Quantum Physics Terahertz radiation General Physics and Astronomy Condensed Matter - Soft Condensed Matter 01 natural sciences Vibration Laser linewidth symbols.namesake Mean field theory Molecular vibration 0103 physical sciences symbols Physics - Biological Physics Atomic physics 010306 general physics Raman spectroscopy Quantum fluctuation Coherence (physics) |
| Zdroj: | Physical Review Letters. 122 |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | Fr\"ohlich discovered the remarkable condensation of polar vibrations into the lowest frequency mode when the system is pumped externally. For a full understanding of the Fr\"ohlich condensate one needs to go beyond the mean field level to describe critical behavior as well as quantum fluctuations. The energy redistribution among vibrational modes with nonlinearity included is shown to be essential for realizing the condensate and the phonon-number distribution, revealing the transition from quasi-thermal to super-Poissonian statistics with the pump. We further study the spectroscopic properties of the Fr\"ohlich condensate, which are especially revealed by the narrow linewidth. This gives the long-lived coherence and the collective motion of the condensate. Finally we show that the proteins such as Bovine Serum Albumin (BSA) and lysozyme are most likely the candidates for observing such collective modes in THz regime by means of Raman or infrared (IR) spectroscopy. Comment: 5 pages, 4 figures + 8 pages Supplementary Material |
| Databáze: | OpenAIRE |
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