内容：

A great advantage of trapped ion crystals is the in-situ access to the dynamics of the atomic particles, which are often not accessible in the emulated system. We emulate the boundary of two atomically flat solids with a self-assembled ion Coulomb crystal in the zigzag phase and study the nanofriction between these back-acting ion chains. In this system, we study second-order phase transitions and the formation and dynamics of topological defects [1-3].

When controlling the dynamics of ion Coulomb crystals to a high level of precision, they can also serve as a platform for novel types of atomic quantum clocks. We present latest results on our measurements of systematic frequency shifts in such a system [4].

[1] Pyka et al., Nat. Commun. 4, 2291 (2013)

[2] Partner et al., New J. Phys. 15, 103013 (2013)

[3] Kiethe et al., Nat. Commun. 8, 15364 (2017)

[4] Keller et al., arXiv 1712.02335  (2017)

人物介绍：

Dr. T.E. Mehlstäubler is an independent research group leader at PTB, Braunschweig and a lecturer at the University of Hannover. She did the undergraduate study at the physics department of Julius-Maximilians-Universität, Würzburg, the master at SUNY Stony Brook, and the Ph. D at the University of Hannover with Prof. W. Ertmer. She has the post-doc. experience at LNE-SYRTE, Paris. Since 2009, she joined the QUEST in PTB as a faculty and pursued the atomic ion clock with multiple ions.