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(2023) Shah, R. - Probing the Degree of Coherence through the Full 1D to 3D crossover[94].pdf (8.49 MB)

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

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posted on 2023-06-10, 06:33 authored by Fedja OrucevicFedja Orucevic, Robert Shah, Thomas BarrettThomas Barrett, Peter KruegerPeter Krueger, Andrea Colcelli, Andrea Trombettoni
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.


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Physical Review Letters




American Physical Society



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a123401 1-7

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  • Atomic, Molecular and Optical Physics Research Group Publications

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