X-ray coherent diffractive imaging of quantum vortices in single helium droplets
ORAL
Abstract
Free, single, rotating superfluid $^{\mathrm{4}}$He nanodroplets (diameter D $=$ 200 - 2000 nm, temperature T $=$ 0.4 K) containing a number of quantum vortices have been studied via ultrafast X-ray coherent diffraction imaging using a free electron laser. The droplets were doped with Xe atoms, which collect on the vortex cores and serve as a contrast agent. In order to obtain the instantaneous positions and shapes of the vortices from the diffraction images, a phase retrieval technique has been developed, which utilizes the droplet boundary as a physical support. The algorithm also uses the droplet's scattering phase as an input for the iterative phase reconstruction. The obtained reconstructions reveal a plethora of transient vortex configurations within the droplet. The details of the algorithm and the possible origin of the observed vortex configuration will be discussed.
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Authors
Rico Mayro Tanyag
University of Southern California
Charles Bernando
University of Southern California
Curtis Jones
University of Southern California
Luis Gomez
University of Southern California
Andrey Vilesov
University of Southern California
Camila Bacellar
Chemical Sciences Division, Lawrence Berkeley National Laboratory
James Cryan
Chemical Sciences Division, Lawrence Berkeley National Laboratory
Katrin Siefermann
Chemical Sciences Division, Lawrence Berkeley National Laboratory
Felix Sturm
Chemical Sciences Division, Lawrence Berkeley National Laboratory
Oliver Gessner
Chemical Sciences Division, Lawrence Berkeley National Laboratory
