Position- and momentum-space two-body correlations in a weakly interacting trapped condensate
| Autor: | Salvatore Butera, David Clément, Iacopo Carusotto |
|---|---|
| Přispěvatelé: | School of Physics and Astronomy, University of Glasgow, Glasgow, UK, Laboratoire Charles Fabry / Gaz Quantiques, Laboratoire Charles Fabry (LCF), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS), BEC-INFM, Università degli Studi di Trento (UNITN) |
| Rok vydání: | 2021 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics Quantum Physics Hanbury Brown and Twiss effect FOS: Physical sciences Inverse Position and momentum space 01 natural sciences 010305 fluids & plasmas Momentum Laser linewidth Amplitude Quantum Gases (cond-mat.quant-gas) Position (vector) Quantum electrodynamics 0103 physical sciences Thermal Quantum Physics (quant-ph) Condensed Matter - Quantum Gases 010306 general physics [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft] QC |
| Zdroj: | Physical Review A Physical Review A, American Physical Society 2021, 103, pp.013302 |
| ISSN: | 2469-9934 2469-9926 1050-2947 |
| Popis: | We investigate the position- and momentum-space two--body correlations in a weakly interacting, harmonically trapped atomic Bose-Einstein condensed gas at low temperatures. The two-body correlations are computed within the Bogoliubov approximation and the peculiarities of the trapped gas are highlighted in contrast to the spatially homogeneous case. In the position space, we recover the anti-bunching induced by the repulsive inter-atomic interaction in the condensed fraction localized around the trap center and the bunching in the outer thermal cloud. In the momentum space, bunching signatures appear for either equal or opposite values of the momentum and display peculiar features as a function of the momentum and the temperature. In analogy to the optical Hanbury Brown and Twiss effect, the amplitude of the bunching signal at close-by momenta is fixed by the chaotic nature of the matter field state and its linewidth is shown to be set by the (inverse of the) finite spatial size of the associated in-trap momentum components. In contrast, the linewidth of the bunching signal at opposite-momenta is only determined by the condensate size. 13 pages, 6 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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