What is a quantum shock wave?
| Autor: | Ian P. McCulloch, F. A. Bayocboc, Karen Kheruntsyan, David Colas, S. A. Simmons, Jason C. Pillay |
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| Rok vydání: | 2020 |
| Předmět: |
Shock wave
Physics Quantum Physics Bose gas Condensed matter physics General Physics and Astronomy Thermal fluctuations FOS: Physical sciences Interference (wave propagation) 01 natural sciences Condensed Matter - Other Condensed Matter Amplitude Phase coherence Position (vector) Quantum Gases (cond-mat.quant-gas) 0103 physical sciences 010306 general physics Condensed Matter - Quantum Gases Quantum Physics (quant-ph) Quantum Other Condensed Matter (cond-mat.other) |
| DOI: | 10.48550/arxiv.2006.15326 |
| Popis: | Shock waves are examples of the far-from-equilibrium behaviour of matter; they are ubiquitous in nature, yet the underlying microscopic mechanisms behind their formation are not well understood. Here, we study the dynamics of dispersive quantum shock waves in a one-dimensional Bose gas, and show that the oscillatory train forming from a local density bump expanding into a uniform background is a result of quantum mechanical self-interference. The amplitude of oscillations, i.e., the interference contrast, decreases with the increase of both the temperature of the gas and the interaction strength due to the reduced phase coherence length. Furthermore, we show that vacuum and thermal fluctuations can significantly wash out the interference contrast, seen in the mean-field approaches, due to shot-to-shot fluctuations in the position of interference fringes around the mean. Comment: Final published version, 6 pages, 3 figures, plus Supplementary Material |
| Databáze: | OpenAIRE |
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