Probing the degree of coherence through the full 1D to 3D crossover

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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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

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