Orucevic, Fedja, Shah, Robert, Barrett, Thomas, Kruger, Peter, Colcelli, Andrea and Trombettoni, Andrea (2023) Probing the degree of coherence through the full 1D to 3D crossover. Physical Review Letters, 130. a123401 1-7. ISSN 0031-9007

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Abstract

We experimentally study a gas of quantum degenerate 87Rb atoms throughout the full dimensional crossover, from a one-dimensional (1D) system exhibiting phase fluctuations consistent with 1D theory to a three-dimensional (3D) phase-coherent system, thereby smoothly interpolating between these distinct, well-understood regimes. Using a hybrid trapping architecture combining an atom chip with a printed circuit board, we continuously adjust the system’s dimensionality over a wide range while measuring the phase fluctuations through the power spectrum of density ripples in time-of-flight expansion. Our measurements confirm that the chemical potential μ controls the departure of the system from 3D and that the fluctuations are dependent on both μ and the temperature T. Through a rigorous study we quantitatively observe how inside the crossover the dependence on T gradually disappears as the system becomes 3D. Throughout the entire crossover the fluctuations are shown to be determined by the relative occupation of 1D axial collective excitations.

Item Type:	Article
Keywords:	Bose gases, Bose-Einstein condensates, Cold atoms and matter waves, Decoherence in quantum gases
Schools and Departments:	School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups:	Atomic, Molecular and Optical Physics Research Group
SWORD Depositor:	Mx Elements Account
Depositing User:	Mx Elements Account
Date Deposited:	22 Mar 2023 09:42
Last Modified:	22 Mar 2023 15:00
URI:	http://sro.sussex.ac.uk/id/eprint/111358

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