Erlangen 2018 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 59: Quantum Gases (Bosons) VI
Q 59.9: Vortrag
Donnerstag, 8. März 2018, 12:30–12:45, K 2.020
Nanofriction & the Aubry-type transition in self-organized systems under the influence of the crystal environment — •Jan Kiethe1, Ramil Nigmatullin2, Dimitri Kalincev1, Thorben Schmirander1, and Tanja E. Mehlstäubler1 — 1Physikalisch-Technische Bundesanstalt, Braunschweig, Deutschland — 2University of Sydney, Sydney, Autralia
The excellent control over trapped ions enables various applications, such as precision spectroscopy and quantum information. Cooling the ions below the potential energy of the Coulomb system will result in crystals, which can be used as quantum simulators or as emulators for non-equilibrium many-body physics. Furthermore, ion traps offer in-situ access to the crystal dynamics, which is often impossible in the emulated systems. While emulating a boundary of two atomically flat solids with a Coulomb crystal with a local defect, we experimentally and numerically found a transition from sticking-to-sliding. Two signatures of an Aubry-type transition were observed: a soft-mode and a symmetry breaking of the crystal configuration. Here we discuss, based on numerical calculations, how the environment of the ion crystal influences the structure and subsequently the phonon spectrum, in order to determine how robust these signatures are. As the actual interacting surface in this model system is inhomogeneously spaced, we also numerically investigate Coulomb crystals with periodic boundary conditions, which exhibit a constant distance between the sliding ion chains, increasing the interacting surface to the complete crystal.